Updated on 2021/11/12

写真a

 
TORII Yasuhiro
 
Organization
Okayama University Hospital Professor
Position
Professor
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Degree

  • PhD ( Osaka University )

Research Interests

  • 歯学臨床教育

  • Clinical Education in Dentistry

Research Areas

  • Life Science / Social dentistry

  • Life Science / Prosthodontics

  • Life Science / Conservative dentistry

  • Life Science / Oral pathobiological science

Education

  • Osaka University   歯学研究科   臨床系

    - 1986

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    Country: Japan

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  • Osaka University    

    - 1986

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  • Osaka University   歯学部   歯学科

    - 1982

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    Country: Japan

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  • Osaka University    

    - 1982

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Research History

  • - 岡山大学岡山大学病院 教授

    2004

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  • - Professor,University Hospital of Medicine and Dentistry,Okayama University

    2004

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Papers

  • What impact does postgraduate clinical training have on empathy among Japanese trainee dentists? International journal

    Toshiko Yoshida, Sho Watanabe, Takayuki Kono, Hiroaki Taketa, Noriko Shiotsu, Hajime Shirai, Yukie Nakai, Yasuhiro Torii

    BMC medical education   21 ( 1 )   53 - 53   2021.1

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    BACKGROUND: Enhancing empathy in healthcare education is a critical component in the development of a relationship between healthcare professionals and patients that would ensure better patient care; improved patient satisfaction, adherence to treatment, patients' medication self-efficacy, improved treatment outcomes, and reduced patient anxiety. Unfortunately, however, the decline of empathy among students has been frequently reported. It is especially common when the curriculum transitions to a clinical setting. However, some studies have questioned the significance and frequency of this decline. Thus, the purpose of this study was to determine the impact of postgraduate clinical training on dental trainees' empathy from cognitive, behavioral, and patients' perspective. METHODS: This study included 64 trainee dentists at Okayama University Hospital and 13 simulated patients (SPs). The trainee dentists carried out initial medical interviews with SPs twice, at the beginning and the end of their clinical training. The trainees completed the Japanese version of the Jefferson Scale of Empathy for health professionals just before each medical interview. The SPs evaluated the trainees' communication using an assessment questionnaire immediately after the medical interviews. The videotaped dialogue from the medical interviews was analyzed using the Roter Interaction Analysis System. RESULTS: No significant difference was found in the self-reported empathy score of trainees at the beginning and the end of the clinical training (107.73 [range, 85-134] vs. 108.34 [range, 69-138]; p = 0.643). Considering the results according to gender, male scored 104.06 (range, 88-118) vs. 101.06 (range, 71-122; p = 0.283) and female 109.17 (range, 85-134) vs. 111.20 (range, 69-138; p = 0.170). Similarly, there was no difference in the SPs' evaluation of trainees' communication (10.73 vs. 10.38, p = 0.434). Communication behavior in the emotional responsiveness category for trainees in the beginning was significantly higher than that at the end (2.47 vs. 1.14, p = 0.000). CONCLUSIONS: Overall, a one-year postgraduate dental training program neither reduced nor increased trainee dentists' empathy levels. Providing regular education support in this area may help trainees foster their empathy.

    DOI: 10.1186/s12909-020-02481-y

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  • Outer membrane vesicles derived from Porphyromonas gingivalis induced cell death with disruption of tight junctions in human lung epithelial cells. International journal

    Yuhan He, Noriko Shiotsu, Yoko Uchida-Fukuhara, Jiajie Guo, Yao Weng, Mika Ikegame, Ziyi Wang, Kisho Ono, Hiroshi Kamioka, Yasuhiro Torii, Akira Sasaki, Kaya Yoshida, Hirohiko Okamura

    Archives of oral biology   118   104841 - 104841   2020.10

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    OBJECTIVE: Porphyromonas gingivalis (P. gingivalis) is a major bacterium responsible for the progression of periodontitis. P. gingivalis produces small vesicles called outer membrane vesicles (OMVs) containing virulence factors. Increasing evidence suggests a close relationship between periodontitis and respiratory system diseases, such as aspiration pneumonia. However, little is known about whether P. gingivalis OMVs give rise to the impediment of lung epithelial cells. We investigated the effect of the OMVs on cell viability and tight junctions of lung epithelial cells. DESIGN: Human lung epithelial A549 cells were treated with P. gingivalis OMVs. Cell viability was evaluated, and cell morphology was examined using scanning electron and phase contrast microscopies. To detect apoptosis induced by P. gingivalis OMVs, activation of caspase-3 and poly ADP-ribose polymerase (PARP) cleavage was examined by using Western blotting. Immunocytochemistry was performed to stain tight junction proteins. RESULTS: P. gingivalis OMVs decreased cell viability in A549 cells in a dose- and time-dependent manner. Microscopic analysis revealed that the OMVs induced morphological changes leading to irregular cell membrane structures. The OMVs caused cell shrinkage, membrane blebbing, and cytoplasmic expulsion in a dose-dependent manner. Western blot analysis showed the OMVs induced caspase-3 activation and PARP cleavage. Treatment with the OMVs disrupted the intact distributions of tight junction proteins. CONCLUSIONS: These results indicate that P. gingivalis OMVs induced cell death by destroying the barrier system in lung epithelial cells. Our present study raises the possibility that P. gingivalis OMVs is an important factor in the engagement of periodontitis with respiratory system diseases.

    DOI: 10.1016/j.archoralbio.2020.104841

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  • Toughening of highly translucent zirconia by monoclinic ZrO2 and SiO2 particle coating.

    Soichiro Uno, Masahiro Okada, Hiroaki Taketa, Yasuhiro Torii, Takuya Matsumoto

    Dental materials journal   39 ( 2 )   295 - 301   2020.3

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    The mechanical properties of highly translucent partially stabilized zirconia (PSZ) need to be improved; however, improvement of mechanical properties often decreases translucency. To overcome this problem, a monoclinic ZrO2 (mZrO2)/SiO2 dispersion was prepared and applied as a coating material for PSZ. The influence of surface treatment by the mZrO2/SiO2 dispersion on the surface topography, crystallography, and mechanical properties of highly translucent PSZ was investigated in this study. Following the treatment, the mechanical strength of highly translucent PSZ improved by 170% compared with control, for the best mZrO2/SiO2 dispersion ratio and heating temperature condition, while maintaining its translucency. The proposed coating is promising for improving the mechanical properties of highly translucent PSZ.

    DOI: 10.4012/dmj.2018-415

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  • Improvement of mechanical properties of Y-TZP by thermal annealing with monoclinic zirconia nanoparticle coating. International journal

    Masahiro Okada, Hiroaki Taketa, Emilio Satoshi Hara, Yasuhiro Torii, Masao Irie, Takuya Matsumoto

    Dental materials : official publication of the Academy of Dental Materials   35 ( 7 )   970 - 978   2019.7

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    OBJECTIVE: To assess whether a thermal annealing with a monoclinic zirconia (mZrO2) nanoparticle coating can improve the reliability of sandblasted yttria-stabilized tetragonal zirconia polycrystals (Y-TZP) and maintain its mechanical strength. METHODS: Commercially available Y-TZP (Lava Frame, 3M Dental Products) disks were sintered and surface-treated as follows: AS (as sintered, with no treatment); SB (sandblasting); SB-TA (sandblasting followed by thermal annealing at 1000 °C); and SB-mZr-TA (sandblasting followed by thermal annealing at 1000 °C with the mZrO2 nanoparticle coating). The mZrO2 nanoparticles of 21 nm in size were prepared by a hydrothermal method, and coated onto Y-TZP sintered disks as a 5 g/L ethanol dispersion. Biaxial flexural strength (S) was measured using the piston-on-three-ball test, and reliability was evaluated by the Weibull modulus (m). RESULTS: Biaxial flexural tests showed a significant increase in the strength of Group SB (SSB = 1445 ± 191 MPa) compared with Group AS (SAS = 1071 ± 112 MPa). The thermal annealing improved the reliabilities of the sandblasted Y-TZP (mSB-TA = 20.14 and mSB-mZr-TA = 21.33), as compared with Group SB (mSB = 7.77). However, the conventional thermal annealing without the mZrO2 coating caused a significant decrease in the strength of sandblasted Y-TZP (SSB-TA = 1273 ± 65 MPa). Importantly, the mZrO2 coating prevented the decrease in the strength caused by conventional thermal annealing (SSB-mZr-TA = 1379 ± 65 MPa). SIGNIFICANCE: The thermal annealing with the mZrO2 nanoparticle coating can improve the reliability of sandblasted Y-TZP and maintain its mechanical strength, which would otherwise be decreased by the conventional annealing process.

    DOI: 10.1016/j.dental.2019.04.002

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  • Optimal sandblasting conditions for conventional-type yttria-stabilized tetragonal zirconia polycrystals. Reviewed International journal

    Masahiro Okada, Hiroaki Taketa, Yasuhiro Torii, Masao Irie, Takuya Matsumoto

    Dental materials : official publication of the Academy of Dental Materials   35 ( 1 )   169 - 175   2019.1

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    OBJECTIVE: To assess the influence of sandblasting conditions applied to conventional-type yttria-stabilized tetragonal zirconia polycrystal (Y-TZP) on surface roughness, phase transformation, and biaxial flexural strength. METHODS: Commercially available Y-TZP (Lava Frame, 3M Dental Products) disks were used after sintering (specimen dimensions: 14mm in diameter and 1.2mm in thickness). The surfaces of specimens were ground, and then sandblast treatments were conducted at different pressures (0.20, 0.25, 0.30, 0.35 and 0.40MPa) and distances (1, 5, 10 and 20mm) with 50μm alumina particles. Surface roughness measurements were performed and scanning electron microscopy (SEM) images were taken for surface characterizations. Phase transformation of Y-TZP was identified by X-ray diffraction (XRD). Biaxial flexural strength was measured using the piston-on-three-ball test. RESULTS: The surface roughness increased significantly by increasing the sandblasting pressure, and microcracks were observed at high sandblasting pressure at 0.40MPa. The shortest sandblasting distance (1mm) was not effective to increase the surface roughness compared with other sandblasting distances. A tetragonal to monoclinic phase transformation was observed after grinding. The degree of the phase transformation tended to increase with sandblasting pressure, and significant effect was independent of the sandblasting distance. The biaxial flexural test showed improved mechanical strengths for the samples after sandblasting at 0.20-0.35MPa, with the maximum strength at 0.25MPa. Sandblasting at 0.40MPa decreased the strength as compared with 0.25MPa. SIGNIFICANCE: The surface roughness increased with increasing the sandblasting pressure, whereas there was an optimal sandblasting pressure range to increase biaxial flexural strength of Y-TZP.

    DOI: 10.1016/j.dental.2018.11.009

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  • Relationship of trainee dentists' self-reported empathy and communication behaviors with simulated patients' assessment in medical interviews. International journal

    Sho Watanabe, Toshiko Yoshida, Takayuki Kono, Hiroaki Taketa, Noriko Shiotsu, Hajime Shirai, Yasuhiro Torii

    PloS one   13 ( 12 )   e0203970   2018

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    OBJECTIVES: We aimed to clarify the communication behaviors between trainee dentists and simulated patients (SPs), to examine how the level of trainee dentists' self-reported empathy influences assessment by SPs in medical interviews. MATERIALS AND METHODS: The study involved 100 trainee dentists at Okayama University Hospital and eight SPs. The trainee dentists conducted initial interviews with the SPs after completing the Japanese version of the Jefferson Scale of Empathy (JSE). All interviews were recorded and analyzed using the Roter Interaction Analysis System (RIAS). The SPs assessed the trainees' communication immediately after each interview. The trainee dentists were classified into two groups (more positive and less positive) according to SP assessment scores. RESULTS: Compared with less-positive trainees, the more-positive trainees scored higher in the RIAS category of emotional expression and lower in the medical data gathering category. There was no difference in dental data gathering between the two groups. SP ratings for more-positive trainees were higher for use of positive talk and emotional expression and lower for giving medical information and dental information. Trainees with more positive ratings from SPs had significantly higher JSE total scores. CONCLUSION: The results of this study suggest that responding to the emotions of patients is an important behavior in dentist-patient communication, according to SPs' positive assessment in medical interviews. Further, SPs' assessment of trainees' communication was related to trainees' self-reported empathy, which indicates that an empathic attitude among dentists is a significant determinant of patient satisfaction.

    DOI: 10.1371/journal.pone.0203970

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Books

  • 歯科医療救急ポケットマニュアル

    医歯薬出版株式会社  2008 

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  • 歯科臨床研修マニュアル アドバンス編 ひとつ上をめざす研修医のために

    永末書店  2007 

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  • Giomer international meeting/Japan proceedings

    Shofu,Kyoto  2003 

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  • 新保存修復学

    クインテッセンス出版株式会社 

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  • バイオフィルム-その生成メカニズムと防止のサイエンス-(共著)

    サイエンスフォーラム 

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MISC

  • 未来の歯科保存学およびその臨床を担う後進の育成 岡山大学病院歯科医師臨床研修における歯科保存臨床教育

    鳥井 康弘

    特定非営利活動法人日本歯科保存学会学術大会プログラムおよび講演抄録集   154回   4 - 4   2021.5

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  • レジンセメントの最近の歯科用セラミックスに対する接着強さの長期耐久性

    入江 正郎, 岡田 正弘, 武田 宏明, 鳥井 康弘, 松本 卓也

    特定非営利活動法人日本歯科保存学会学術大会プログラムおよび講演抄録集   154回   86 - 86   2021.5

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  • 2ステップボンディング材の初期接着強さの経時的変化

    矢部 淳, 入江 正郎, 岡田 正弘, 武田 宏明, 鳥井 康弘, 松本 卓也

    特定非営利活動法人日本歯科保存学会学術大会プログラムおよび講演抄録集   154回   99 - 99   2021.5

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  • サンドブラスト処理による酸処理チタンの軟組織接着性の増強

    矢部 淳, 岡田 正弘, 武田 宏明, ハラ・エミリオ・サトシ, 鳥井 康弘, 松本 卓也

    日本歯科理工学会誌   40 ( Special Issue77 )   3 - 3   2021.3

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  • 新規ボンディング材の歯質接着性からの検討 湿潤vs.乾燥

    入江 正郎, 岡田 正弘, 武田 宏明, 鳥井 康弘, 松本 卓也

    特定非営利活動法人日本歯科保存学会学術大会プログラムおよび講演抄録集   153回   59 - 59   2020.11

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  • 新規レジンセメントの歯質接着性からの検討 各種処理材の影響

    入江 正郎, 岡田 正弘, 武田 宏明, 鳥井 康弘, 松本 卓也

    特定非営利活動法人日本歯科保存学会学術大会プログラムおよび講演抄録集   153回   58 - 58   2020.11

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  • 汚染除去材が接着性レジンセメントのせん断接着強さに及ぼす影響

    矢部 淳, 入江 正郎, 岡田 正弘, 野崎 高儀, 武田 宏明, 鳥井 康弘, 松本 卓也

    特定非営利活動法人日本歯科保存学会学術大会プログラムおよび講演抄録集   153回   60 - 60   2020.11

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  • アドバンス・ケア・プランニングに基づき末期がん患者の終末期医療に対して歯科治療介入を行った1症例

    矢部 淳, 白井 肇, 河崎 龍, 野崎 高儀, 小山 梨菜, 塩津 範子, 武田 宏明, 河野 隆幸, 吉田 登志子, 鳥井 康弘

    日本総合歯科学会雑誌   12   78 - 84   2020.10

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    今回,終末期の患者に対して約2年半に渡って総合的に歯科医療を提供した。症例は74歳男性である。岡山大学病院に口腔衛生管理のため総合歯科受診し,肺がん既往のため同呼吸器外科にも長年通院していた。2017年4月から肺がん再発に伴い口腔内感染源除去,咀嚼機能の回復を行うとともに化学療法に向けた口腔衛生管理や指導を行った。しかし化学療法の副反応として間質性肺疾患が発症したことを契機に,患者との共同意思決定により緩和ケアへと移行し,骨吸収抑制薬関連顎骨壊死予防のための口腔衛生管理を行った。その後のアドバンス・ケア・プランニングによりQuality of life(QOL)の維持と延命治療の拒否を希望したため,点滴に頼らず水分栄養を経口摂取するための口腔機能の維持管理を目的に治療を継続した。その後骨吸収抑制薬関連顎骨壊死発症に伴い抜歯を行い,義歯新製を行いつつ逝去の1ヵ月前まで通院が継続し,その間口腔機能を維持できた。また,全身状態の悪化により他院緩和ケア病棟に入院した後も,完成義歯を持参して見舞うなど患者に寄り添うことができた。アドバンス・ケア・プランニングにより患者の希望に寄り添いつつ前向きな歯科治療を提供することで,患者および家族の満足度の向上に寄与した。研修歯科医の当初から比較的長期に治療を継続することでターミナルケアにおける歯科治療の意義を強く意識するようになった症例であった。(著者抄録)

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  • 肺および口腔上皮細胞におけるPorphyromonas gingivalis由来の細胞外小胞の障害性

    山口 真輝, 塩津 範子, 竹本 史子, 福原 瑶子, 池亀 美華, 吉田 賀弥, 上岡 寛, 鳥井 康弘, 佐々木 朗, 岡村 裕彦

    Journal of Oral Biosciences Supplement   2020   164 - 164   2020.9

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  • ヒト血漿汚染被着面に対する汚染除去材の効果 接着強さからの検討

    入江 正郎, 岡田 正弘, 武田 宏明, 鳥井 康弘, 松本 卓也

    特定非営利活動法人日本歯科保存学会学術大会プログラムおよび講演抄録集   152回   95 - 95   2020.6

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  • 単斜晶ジルコニアとシリカを焼付した高透光性ジルコニアの機械的性質

    岡田 正弘, 宇野 聡一郎, 武田 宏明, 鳥井 康弘, 松本 卓也

    日本歯科理工学会誌   39 ( Special Issue75 )   7 - 7   2020.4

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  • 軟組織接着システムの開発

    矢部 淳, 岡田 正弘, ハラ・エミリオ・サトシ, 鳥井 康弘, 松本 卓也

    岡山歯学会雑誌   38 ( 2 )   90 - 90   2019.12

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  • 唾液汚染被着面に対する汚染除去材の効果 接着強さからの検討

    入江 正郎, 岡田 正弘, 武田 宏明, 鳥井 康弘, 松本 卓也

    特定非営利活動法人日本歯科保存学会学術大会プログラムおよび講演抄録集   151回   69 - 69   2019.10

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  • 単斜晶ZrO2とSiO2ナノ粒子を用いた高透光性ジルコニアの表面処理による機械的強さ向上

    宇野 聡一郎, 鳥井 康弘, 松本 卓也

    岡山歯学会雑誌   38 ( 1 )   1 - 8   2019.6

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    高透光性ジルコニア(イットリアの含有量を増やして結晶相組成を変化させた部分安定化ジルコニア:PSZ)の機械的強度を向上させる工夫としてこれまで、イットリア以外の金属酸化物を添加する方法や、ジルコニア表層にガラスを浸漬させる手法などが試みられているが、強度向上は不十分であった。著者等は、強化ガラスの強化機構である表面圧縮応力層から着想を得て、ジルコニア表面をコーティングすることで表面圧縮応力層を形成させ、高透光性を保ったまま機械的強度を向上させる方法の開発を目指した。コーティング材として、単斜晶ZrO2とSiO2を混合させた分散液を用いた。単斜晶ZrO2の結晶相変化を利用することでPSZ表面に圧縮応力層を形成することを狙いとし、SiO2は無機結合材として添加した。分散液コーティング後に熱処理をすることでPSZの機械的強度は最大1.7倍まで向上した。

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  • 要介護高齢者に対応するための研修歯科医への教育について

    武田 宏明, 渡邉 翔, 塩津 範子, 河野 隆幸, 吉田 登志子, 白井 肇, 鳥井 康弘

    日本歯科医学教育学会総会・学術大会プログラム・抄録集   38回   129 - 129   2019.6

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  • 最近の歯科用セラミックスに対する接着強さ

    入江 正郎, 岡田 正弘, 武田 宏明, 鳥井 康弘, 吉原 久美子, 松本 卓也

    特定非営利活動法人日本歯科保存学会学術大会プログラムおよび講演抄録集   150回   63 - 63   2019.5

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  • 単斜晶ナノジルコニア焼付による従来型ジルコニアの機械的性質改善

    岡田 正弘, 武田 宏明, 鳥井 康弘, 松本 卓也

    日本歯科理工学会誌   38 ( Special Issue73 )   8 - 8   2019.4

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  • 【歯科医学教育白書2017年版(2015〜2017年)】(第11章)大学院教育と歯科医学教育研究の動向 歯科医学研究の動向

    鳥井 康弘

    日本歯科医学教育学会雑誌   別冊   150 - 151   2019.3

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  • 【歯科医学教育白書2017年版(2015〜2017年)】(第11章)大学院教育と歯科医学教育研究の動向 歯科医学教育に関する研究

    鳥井 康弘

    日本歯科医学教育学会雑誌   別冊   152 - 154   2019.3

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  • 新規表面処理法が高透光性ジルコニアの機械的性質および接着性に及ぼす影響

    武田 宏明, 岡田 正弘, 宇野 聡一郎, 入江 正郎, 鳥井 康弘, 松本 卓也

    岡山歯学会雑誌   37 ( 2 )   84 - 84   2018.12

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  • 岡山大学歯学部における医療コミュニケーション学演習の概要と評価 過去5年間の学修内容と学修方略の検討

    吉田 登志子, 白井 肇, 兒玉 直紀, 澁谷 和彦, 竹内 倫子, 鳥井 康弘, 久保田 聡

    岡山歯学会雑誌   37 ( 2 )   43 - 54   2018.12

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    医療コミュニケーション学演習の概要を報告し、長所と短所について検討した。学修内容は大きく分けて、対人コミュニケーションの基礎、自分のコミュニケーションスタイルおよび傾聴法・質問法、初診時医療面接、患者対応・電話対応、医療安全、患者援助のコミュニケーションの六つから成り立っている。医療コミュニケーション学演習を履修した本学歯学部3年次生総計229名を対象にアンケート調査を実施した。学生が興味をもった学修内容として「初診時医療面接」が最も多く、次いで「対人コミュニケーションの基礎」、「患者対応・電話対応」の順であった。一方、興味をもたなかった学修内容として「患者援助のコミュニケーション」が最も多かった。また、演習の長所に関して「コミュニケーションを学ぶことができた」のカテゴリーに属する意見を述べた学生が多かった。

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  • 最近のフロアブルコンポジットの重合挙動と窩洞適合性

    入江 正郎, 岡田 正弘, 武田 宏明, 鳥井 康弘, 吉原 久美子, 松本 卓也

    特定非営利活動法人日本歯科保存学会学術大会プログラムおよび講演抄録集   149回   64 - 64   2018.10

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  • 高透光性ジルコニアに対する機械的表面処理条件の検討

    岡田 正弘, 藤井 惠朗, 宇野 聡一郎, 武田 宏明, 鳥井 康弘, 松本 卓也

    日本歯科理工学会誌   37 ( Special Issue72 )   35 - 35   2018.9

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  • 研修歯科医が経験するインシデントを共有する手法の開発

    白井 肇, 河野 隆幸, 武田 宏明, 塩津 範子, 渡邉 翔, 吉田 登志子, 鳥井 康弘

    日本歯科医学教育学会総会・学術大会プログラム・抄録集   37回   146 - 146   2018.7

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  • 初診時医療面接における研修歯科医に対する指導歯科医と模擬患者による評価の関係性

    吉田 登志子, 渡邉 翔, 河野 隆幸, 武田 宏明, 塩津 範子, 白井 肇, 鳥井 康弘

    日本歯科医学教育学会総会・学術大会プログラム・抄録集   37回   150 - 150   2018.7

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  • 研修歯科医を対象とした多職種によるセミナーが多職種連携に与える教育効果

    園井 教裕, 河野 隆幸, 白井 肇, 武田 宏明, 塩津 範子, 曽我 賢彦, 鳥井 康弘

    日本歯科医学教育学会総会・学術大会プログラム・抄録集   37回   150 - 150   2018.7

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  • レジンセメントの大臼歯用CAD/CAM Blockに対するせん断接着強さ

    入江 正郎, 武田 宏明, 鳥井 康弘, 吉原 久美子, 松本 卓也

    特定非営利活動法人日本歯科保存学会学術大会プログラムおよび講演抄録集   148回   61 - 61   2018.5

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  • 高透光性ジルコニアの機械的強さに及ぼす表面処理の影響

    大島 直也, 岡田 正弘, 宇野 聡一郎, 武田 宏明, 鳥井 康弘, 松本 卓也

    日本歯科理工学会誌   37 ( Special Issue71 )   38 - 38   2018.3

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  • 岡山大学病院歯科医師臨床研修修了女性歯科医師へのアンケート調査 勤務への満足に影響を与える項目

    塩津 範子, 河野 隆幸, 武田 宏明, 白井 肇, 吉田 登志子, 鳥井 康弘

    岡山歯学会雑誌   36 ( 2 )   37 - 43   2018.1

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    当大学病院での歯科医師臨床研修を修了した女性歯科医師188人を対象に勤務への満足度についてアンケート調査を行い、114人から有効回答が得られた。現在就労している91人のうち、70人(76.9%)が勤務に満足していた。経験年数(1〜4年、5年以上)、認定医もしくは専門医の有無、勤務形態(常勤、非常勤)、開業の有無(開業、勤務)、勤務場所(診療所、病院もしくは大学病院)、休職経験の有無、結婚の有無、配偶者の職業(歯科医師、以下医師以外)、子供の有無と勤務への満足度との関係を検討したところ、勤務形態においてのみ常勤は非常勤に比べ満足度が高い傾向があった。勤務に満足している理由は「やりがいがある」、「上司や同僚の理解がある」が多く、勤務に不満足な理由は「家庭と勤務の両立が難しい」、「プライベートの時間がない」、「男性主導社会」が多かった。常勤では満足の理由・不満足の理由ともに"上司の理解"であり、非常勤ではいずれも"家庭と仕事の両立"で、非常勤においてのみ「収入が悪い」「勉強時間がない」も不満足の理由として挙げられていた。以上より、女性歯科医師の勤務への満足度は勤務形態に左右されると考えられた。

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  • ファイバーポストとコアー材の引き抜き強さ

    入江 正郎, 武田 宏明, 鳥井 康弘, 吉原 久美子, 松本 卓也

    特定非営利活動法人日本歯科保存学会学術大会プログラムおよび講演抄録集   147回   148 - 148   2017.10

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  • 女性歯科医師の考える理想の歯科医師像 岡山大学病院歯科医師臨床研修を修了した女性歯科医師へのアンケート調査の分析

    塩津 範子, 桑山 香織, 河野 隆幸, 武田 宏明, 鈴木 康司, 白井 肇, 吉田 登志子, 鳥井 康弘

    日本総合歯科学会雑誌   9 ( 9 )   28 - 35   2017.10

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    我々は,女性歯科医師のキャリア形成やライフプランに影響を与える要因を検討する目的で,平成18〜24年度に岡山大学病院で歯科医師臨床研修を行った女性歯科医師188人を対象にアンケート調査を行った。そのうち,本稿では女性歯科医師が考える「理想の歯科医師像」について,テキストマイニングソフトを用い,分析した。回答者の理想の歯科医師像は,歯科治療の技術や患者との関係性のみではなく自身の環境に触れたものが多かった。全体で最も出現頻度が高いキーワードは「歯科医師」であり,以下「仕事」,「家庭」,「患者」,「両立」などとなった。分析結果から,女性歯科医師が考える理想の歯科医師像はワークライフバランスを重視していることが伺え,そのバランスの割合や重んじる部分は結婚,子供,就労,休職経験の有無といった状況によって異なると考えられた。女性のライフコースが多様化している現在,どの時期にライフイベントを行うことになっても,仕事との両立ができるようなサポート体制の整備や,男性歯科医師を含むすべての就労者にとって家族のことを考えやすい環境を整備することが大切である。(著者抄録)

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  • Resin adhesion strengths to zirconia ceramics after primer treatment with silane coupling monomer or oligomer.

    Masahiro Okada, Kazusa Inoue, Masao Irie, Hiroaki Taketa, Yasuhiro Torii, Takuya Matsumoto

    Dental materials journal   36 ( 5 )   600 - 605   2017.9

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    Resin bonding to zirconia ceramics is difficult to achieve using the standard methods for conventional silica-based dental ceramics, which employ silane coupling monomers as primers. The hypothesis in this study was that a silane coupling oligomer a condensed product of silane coupling monomers would be a more suitable primer for zirconia. To prove this hypothesis, the shear bond strengths between a composite resin and zirconia were compared after applying either a silane coupling monomer or oligomer. The shear bond strength increased after applying a non-activated ethanol solution of the silane coupling oligomer compared with that achieved when applying the monomer. Thermal treatment of the zirconia at 110 degrees C after application of the silane coupling agents was essential to improve the shear bond strength between the composite resin cement and zirconia.

    DOI: 10.4012/dmj.2016-334

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  • 歯科用ジルコニアへのサンドブラスト処理の影響

    岡田 正弘, 武田 宏明, 鳥井 康弘, 入江 正郎, 松本 卓也

    日本歯科理工学会誌   36 ( 5 )   327 - 327   2017.9

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  • Morphological and Functional Analyses of the Tight Junction in the Palatal Epithelium of Mouse.

    Noriko Shiotsu, Tadafumi Kawamoto, Mariko Kawai, Mika Ikegame, Yasuhiro Torii, Hiroyuki Sasaki, Toshio Yamamoto

    Acta histochemica et cytochemica   50 ( 4 )   119 - 125   2017.8

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    Tight junction (TJ) is one of the cell-cell junctions and known to have the barrier and fence functions between adjacent cells in both simple and stratified epithelia. We examined the distribution pattern, constitutive proteins, and permeability of TJ in the stratified squamous epithelium of the palatal mucosa of mice. Ultrastructural observations based on the ultrathin section and freeze-fracture methods revealed that poorly developed TJs are located at the upper layer of the stratum granulosum. The positive immunofluorescence of occludin (OCD), claudin (CLD)-1 and -4 were localized among the upper layer of the stratum granulosum showing a dot-like distribution pattern. And CLD-1 and -4 were localized among the stratum spinosum and the lower part of stratum granulosum additionally showed a positive reaction along the cell profiles. Western blotting of TJ constitutive proteins showed OCD, CLD-1, -2, -4, and -5 bands. The permeability test using biotin as a tracer revealed both the areas where biotin passed through beyond OCD positive points and the areas where biotin stopped at OCD positive points. These results show that poor TJs localize at the upper layer of the stratum granulosum of the palatal epithelium, and the TJs are leaky and include at least CLD-1 and -4.

    DOI: 10.1267/ahc.17006

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  • 研修歯科医師の共感性に関する研究 自己評価と行動評価および模擬患者評価との比較

    渡邉 翔, 吉田 登志子, 武田 宏明, 塩津 範子, 鈴木 康司, 河野 隆幸, 白井 肇, 鳥井 康弘

    医学教育   48 ( Suppl. )   253 - 253   2017.8

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  • 岡山大学病院歯科医師臨床研修における在宅歯科医療研修の導入について

    武田 宏明, 杉本 恭子, 渡邉 翔, 塩津 範子, 鈴木 康司, 河野 隆幸, 吉田 登志子, 白井 肇, 浅海 淳一, 窪木 拓男, 鳥井 康弘

    日本歯科医学教育学会総会・学術大会プログラム・抄録集   36回   155 - 155   2017.7

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  • 歯学教育認証評価検討WGによる歯学教育認証評価トライアルを受審して

    川瀬 明子, 宮脇 卓也, 久保田 聡, 松尾 龍二, 大原 直也, 松本 卓也, 鳥井 康弘, 飯田 征二, 窪木 拓男, 浅海 淳一, 岡山大学歯学部歯学教育認証評価トライアル対策WG

    日本歯科医学教育学会総会・学術大会プログラム・抄録集   36回   110 - 110   2017.7

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  • 歯科医師臨床研修期間に経験するインシデント調査

    白井 肇, 河野 隆幸, 武田 宏明, 塩津 範子, 渡邉 翔, 吉田 登志子, 鈴木 康司, 鳥井 康弘

    日本歯科医学教育学会総会・学術大会プログラム・抄録集   36回   155 - 155   2017.7

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  • ファイバーポストとコアー材の初期の引き抜き強さ

    入江 正郎, 武田 宏明, 鳥井 康弘, 吉原 久美子, 松本 卓也

    特定非営利活動法人日本歯科保存学会学術大会プログラムおよび講演抄録集   146回   91 - 91   2017.5

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  • 研修歯科医はどのような歯内療法を難しく感じるか 電子ポートフォリオの内容からの分析

    塩津 範子, 河野 隆幸, 武田 宏明, 野崎 高儀, 渡邉 翔, 桑山 香織, 鳥井 康弘

    特定非営利活動法人日本歯科保存学会学術大会プログラムおよび講演抄録集   146回   152 - 152   2017.5

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  • ジルコニアの曲げ強さに与える表面処理の影響

    岡田 正弘, 武田 宏明, 鳥井 康弘, 松本 卓也

    日本歯科理工学会誌   36 ( 2 )   67 - 67   2017.3

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  • 女性歯科医師の考える理想の歯科医師像-岡山大学病院臨床研修修了女性歯科医師へのアンケート調査から-.

    塩津範子, 桑山香織, 河野隆幸, 武田宏明, 鈴木 康司, 白井 肇, 吉田登志子, 鳥井康弘

    日本総合歯科学会雑誌   9 ( 1 )   28 - 35   2017

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  • 岡山大学病院歯科医師臨床研修における歯科保存治療の経験症例の分析

    塩津 範子, 野崎 高儀, 渡邉 翔, 小野 早和子, 武田 宏明, 桑山 香織, 河野 隆幸, 鳥井 康弘

    特定非営利活動法人日本歯科保存学会学術大会プログラムおよび講演抄録集   145回   172 - 172   2016.10

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  • 早期見学実習の一環として実施した外来患者エスコート実習の学生評価ー実習直後と5 年経過後の臨床実習終了時での振り返り評価との比較ー.

    吉田登志子, 山中玲子, 鈴木康司, 河野隆幸, 白井肇, 塩津範子, 武田宏明, 兒玉直紀, 鳥井康弘, 窪木拓男

    日本歯科医学教育学会雑誌   32 ( 2 )   84 - 92   2016

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  • Peptide-modified Substrate for Modulating Gland Tissue Growth and Morphology In Vitro. International journal

    Hiroaki Taketa, Gulsan Ara Sathi, Mahmoud Farahat, Kazi Anisur Rahman, Takayoshi Sakai, Yoshiaki Hirano, Takuo Kuboki, Yasuhiro Torii, Takuya Matsumoto

    Scientific reports   5   11468 - 11468   2015.6

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    In vitro fabricated biological tissue would be a valuable tool to screen newly synthesized drugs or understand the tissue development process. Several studies have attempted to fabricate biological tissue in vitro. However, controlling the growth and morphology of the fabricated tissue remains a challenge. Therefore, new techniques are required to modulate tissue growth. RGD (arginine-glycine-aspartic acid), which is an integrin-binding domain of fibronectin, has been found to enhance cell adhesion and survival; it has been used to modify substrates for in vitro cell culture studies or used as tissue engineering scaffolds. In addition, this study shows novel functions of the RGD peptide, which enhances tissue growth and modulates tissue morphology in vitro. When an isolated submandibular gland (SMG) was cultured on an RGD-modified alginate hydrogel sheet, SMG growth including bud expansion and cleft formation was dramatically enhanced. Furthermore, we prepared small RGD-modified alginate beads and placed them on the growing SMG tissue. These RGD-modified beads successfully induced cleft formation at the bead position, guiding the desired SMG morphology. Thus, this RGD-modified material might be a promising tool to modulate tissue growth and morphology in vitro for biological tissue fabrication.

    DOI: 10.1038/srep11468

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  • 女性歯科医師のキャリアに影響を与える要因に関する研究-岡山大学病院臨床研修修了女性歯科医師へのアンケート調査:結婚・子供の有無の影響-

    塩津範子, 桑山香織, 河野隆幸, 大塚恵理, 武田宏明, 鈴木康司, 白井 肇, 吉田登志子, 鳥井康弘

    岡山歯学会雑誌   34 ( 2 )   47 - 51   2015

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  • 歯周治療に関連するポートフォリオから見た研修歯科医の振り返りについて

    河野隆幸, 桑山香織, 大塚恵理, 塩津範子, 武田宏明, 太田亜希, 鈴木康司, 白井 肇, 吉田登志子, 鳥井康弘

    日本総合歯科学会雑誌   6 ( 1 )   63 - 66   2014

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  • 岡山大学病院における研修歯科医に対する患者安全教育の取り組み

    白井 肇, 塩津範子, 武田宏明, 大塚恵理, 桑山香織, 鈴木康司, 河野隆幸, 吉田登志子, 鳥井康弘

    日本総合歯科学会雑誌   6 ( 1 )   39 - 41   2014

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  • 岡山大学病院歯科医師臨床研修における経験内容について アンケート調査による分析

    鈴木康司, 河野隆幸, 白井肇, 塩津範子, 武田宏明, 大塚恵理, 吉田登志子, 鳥井康弘

    岡山歯学会雑誌   32 ( 2 )   49 - 56   2013

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  • 岡山大学病院における研修歯科医の動向調査

    鈴木康司, 河野隆幸, 白井 肇, 桑山香織, 大塚恵理, 武田宏明, 塩津範子, 鳥井康弘

    日本総合歯科協議会雑誌   5 ( 特別号 )   39 - 41   2013

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  • 女性歯科医のキャリア形成に関する意識調査-岡山大学病院女性研修歯科医における将来展望-

    大塚恵理, 塩津範子, 武田宏明, 桑山香織, 鈴木康司, 河野隆幸, 白井 肇, 鳥井康弘

    日本総合歯科協議会雑誌   5 ( 特別号 )   53 - 56   2013

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  • 歯科医師卒後臨床研修におけるチーム医療研修プログラム -研修歯科医のに関心および理解に与えた効果の検討-

    山中玲子, 曽我賢彦, 吉冨愛子, 白井肇, 鈴木康司, 河野隆幸, 鳥井康弘, 森田学

    歯科医学教育学会雑誌   28 ( 2 )   76 - 84   2012

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  • 岡山大学病院における研修歯科医の動向調査

    鈴木 康司, 河野 隆幸, 白井 肇, 岡 祐佳, 武田 宏明, 塩津 範子, 鳥井 康弘

    岡山歯学会雑誌   30 ( 1 )   41 - 41   2011.6

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  • 模擬患者を活用した歯科シミュレーション教育のための教育資源データベースの開発

    吉田登志子, 中野田紳一, 白井 肇, 仲井雪絵, 目瀬 浩, 木尾哲朗, 鈴木康司, 河野隆幸, 鳥井康弘

    日本歯科医学教育学会雑誌   26 ( 3 )   331 - 336   2010

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  • 岡山大学病院歯科医師臨床研修におけるWebを用いた電子ポートフォリオシステムの評価

    河野隆幸, 鈴木康司, 白井 肇, 岡 祐佳, 鳥井康弘

    岡山歯学会雑誌   28 ( 1 )   27 - 36   2009

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  • 医療および介護・社会福祉系専門資格の認知度に関する研究 研修歯科医師と非医療系大学生との比較

    佐藤法仁, 渡辺朱理, 鳥井康弘, 苔口進

    医学と生物学   153 ( 11 )   540 - 544   2009

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  • Occlusion: Supporting and Pacing Force Distribution

    Minagi S, Kinuta Y, Sejima J, Hara T, Nishigawa G, Maruo Y, Arima T, Oki K, Oka M, Hasegawa K, Kodama N, Shimazu-Kodama C, Suwaki M, Torii Y, Shirai H

    Prosthodontic Research & Practice   7 ( 2 )   117 - 119   2008

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  • 歯科医師臨床研修における電子ポートフォリオシステムの活用

    河野隆幸, 中野田紳一, 白井 肇, 鈴木康司, 岡 祐佳, 鳥井康弘

    日本歯科医学教育学会雑誌   24 ( 1 )   40 - 47   2008

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  • 歯学臨床教育の現状と将来

    鳥井康弘

    岡山歯学会雑誌   26 ( 2 )   75 - 81   2007

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  • 平成18年度岡山大学医学部・歯学部附属病院歯科医師臨床研修における歯科保存分野診療研修の分析

    河野隆幸, 山路公造, 吉山昌宏, 新井英雄, 高柴正悟, 鳥井康弘

    日本歯科保存学雑誌   50 ( 6 )   731 - 739   2007

  • 研修歯科医に対する薬剤情報に関するアンケート調査と情報提供の有用性

    宮崎俊明, 相良英憲, 錦織淳美, 古野勝志, 千堂年昭, 鈴木康司, 河野隆幸, 白井肇, 鳥井康弘, 五味田裕

    日本病院薬剤師会雑誌   43 ( 7 )   934 - 937   2007

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  • 岡山大学医学部・歯学部附属病院における平成18年度歯科医師臨床研修の状況 第2報 歯科保存および歯科補綴関連研修内容の分析

    鈴木康司, 河野隆幸, 白井肇, 岡祐佳, 鳥井康弘

    岡山歯学会雑誌   26 ( 2 )   111 - 117   2007

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  • 岡山大学医学部・歯学部附属病院における平成18年度歯科医師臨床研修の状況 第1報 電子ポートフォリオシステムによる診療分野別分析

    河野隆幸, 鈴木康司, 白井肇, 岡祐佳, 鳥井康弘

    岡山歯学会雑誌   26 ( 2 )   103 - 109   2007

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  • Effect of fluoride-releasing liner on demineralized dentin. International journal

    Toshiyuki Itota, Satoshi Nakabo, Yasuhiro Torii, Tomoko Narukami, Junichi Doi, Masahiro Yoshiyama

    Quintessence international (Berlin, Germany : 1985)   37 ( 4 )   297 - 303   2006.4

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    OBJECTIVE: The aim of this study was to evaluate the remineralization of residual demineralized dentin underneath restorations by fluoride-releasing liners in vitro. METHOD AND MATERIALS: Two glass-ionomer cement liners, Lining Cement (GC) and RK-141A (GC), and two light-cured resin liners with and without 5 wt% NaF were used in this study. The resin liners were made by mixing TEGDMA and bis-GMA. Class 5 cavities were prepared on extracted human premolars. Demineralized dentin was promoted by using a bacterial caries induction system at the cavity floor. Cavities were restored with a resin composite following application of each liner. Specimens were then stored for 4 weeks at 37 degrees C and 100% humidity. After storage, the specimens were cut through the restorations, and axial sections of about 80-microm thickness were prepared. Contact microradiographs were taken, and the radiopacity of the demineralized dentin layer underneath the liner was analyzed. RESULTS: The ratios of radiopacity of demineralized dentin under the fluoride-releasing liners were significantly higher than those under the resin liner without fluoride release. Although the amounts of fluoride release from the glass-ionomer cement liners were lower than that from the resin liner with fluoride release, there were no significant differences in the ratios of radiopacity in demineralized dentin layers among the 3 liners with fluoride release. CONCLUSION: Although the fluoride released from liners can enhance remineralization of demineralized dentin, the amount of fluoride release does not affect the ratio of radiopacity in the remineralized dentin.

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  • Effect of two-step adhesive systems on inhibition of secondary caries around fluoride-releasing resin composite restorations in root dentine. International journal

    Toshiyuki Itota, Satoshi Nakabo, Tomoko Narukami, Yoko Tashiro, Yasuhiro Torii, John F McCabe, Masahiro Yoshiyama

    Journal of dentistry   33 ( 2 )   147 - 54   2005.2

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    Objective. The purpose of this study was to investigate the effect of two-step adhesive systems on secondary caries inhibition around fluoride-releasing materials in vitro.
    Methods. Two self-etching primer systems, Clearfil SE Bond (SE) and UniFil Bond (UB), and two one-bottle systems with a totat-etch wet-bonding technique, Single Bond (SB) and One-Step (OS), were used prior to placement of resin composites either with (Reactmer) or without (Z100) fluoride release. Class V cavities prepared in extracted human premolars were restored with various combinations of materials: Reactmer/SE, Reactmer/UB, Reactmer/SB, Reactmer/OS, Z100/SE, Z100/UB, Z100/SB and Z100/OS. After storage for 14 days, the restored teeth were incubated in bacterial medium containing sucrose with Streptoccus mutans for 2 weeks. Water sorption and desorption of the adhesives and fluoride release from the resins either coated with adhesive or uncoated were also determined.
    Results. The one-bottle groups showed higher water sorption and desorption than the self-etching primer groups. Although fluoride release from the Reactmer specimens was suppressed by the adhesive coating, the one-bottle groups allowed significantly higher fluoride release than the self-etching primer groups. On microradiographs, the radio-opaque layers adjacent to the Reactmer restorations were thick and clear, white the layers adjacent to the Z100 restorations were thin and unclear. For the Reactmer restorations, the radio-opaque Layers associated with the one-bottle groups were significantly thicker than for the self-etching primer groups.
    Conclusions. These results indicated that the use of one-bottle wet-bonding systems for bonding of fluoride-releasing resin composites to dentine may contribute to inhibit secondary caries compared to self-etching primer systems. (C) 2004 Elsevier Ltd. All rights reserved.

    DOI: 10.1016/j.jdent.2004.09.003

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  • Calbindin D-28k distribution in odontoblasts underneath tertiary dentine in human carious teeth. International journal

    Toshiyuki Itota, Yoko Tashiro, Yasuhiro Torii, Yoshihiro Nishitani, John F McCabe, Masahiro Yoshiyama

    Archives of oral biology   49 ( 1 )   37 - 43   2004.1

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    Objective: The aim of this study was to examine the calbindin D-28k immunoreactivity in carious teeth to know whether this protein may have a function in tertiary dentine formation. Methods: Human extracted teeth with or without carious lesions were immersion-fixed with Zamboni fixative, demineralized in 4.13% EDTA solution (pH 7.4), frozen-sectioned, and processed for calbindin immunoreactivity and hematoxylin-eosin stain. The intensity of the immunostaining was evaluated by quantitative densitometry. Results: In intact teeth, numerous odontoblasts were aligned underneath the secondary dentine and their cell bodies showed the immunoreactivity. In carious teeth, tertiary dentine had poor- or rich tubular patterns under the carious lesion. Underneath the tubule-poor tertiary dentine, distinct odontoblasts could not be seen at the central site. However, some cells with a flat appearance were located at this site and were immunonegative for calbindin D-28k. On the other hand, columnar odontoblasts were seen at the peripheral site, and their cell bodies and processes showed strong immunoreactivity. Underneath the tubule-rich tertiary dentine, columnar odontoblasts were abundantly distributed, and the strong immunoreactivity was observed in their cell bodies and processes. The immunoreactivity in odontoblasts underneath the tertiary dentine with poor or rich tubular pattern was more intense than that for the secondary dentine in intact teeth (P < 0.05). On the other hand, the intensity of the immunoreactivity in odontobtasts was similar underneath the secondary dentine in intact and carious teeth. Conclusions: The present study demonstrated that calbidin D-28k was actively synthesised by odontobtasts under the carious lesion. These findings may suggest that this protein plays an important rote in the tertiary dentine formation. (C) 2003 Elsevier Ltd. All rights reserved.

    DOI: 10.1016/S0003-9969(03)00183-3

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  • Micro-tensile bond strength of self-etching primer adhesive systems to human coronal carious dentin.

    Doi J, Itota T, Torii Y, Nakabo S, Yoshiyama M

    J Oral Rehabil   2004

  • 客観的臨床能力試験(OSCE)のステーション間におけるコミュニケーション技能評価の関連性について.

    吉田登志子, 宮脇正一, 新井英雄, 鳥井康弘, 荒川 光, 下野 勉, 吉山昌宏, 鈴木一臣, 永井教之

    日本歯科医学教育学会雑誌   2004

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  • 窩洞形成時疼痛の中枢抑制機構の解明 ―ラット最後野におけるドーパミン受容体の局在―.

    伊澤俊次, 高木 了, 土居潤一, 仲保 聡, 高畑安光, 西谷登美子, 西谷佳浩, 高務朋将, 清水洋利, 糸田俊之, 鳥井康弘, 吉山昌宏

    日本歯科保存学雑誌   2004

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  • Effect of 2-hydroxyethyl methacrylate pre-treatment on micro-tensile bond strength of resin composite to demineralized dentin.

    Doi J, Itota T, Torii Y, Nakabo S, Yoshiyama M

    J Oral Rehabil   2004

  • Effect of EDTA conditioning on bond strength to bovine dentin promoted by four current adhesives. International journal

    Yasuhiro Torii, Rie Hikasa, Shyuichi Iwate, Fumiko Oyama, Kousuke Itou, Masahiro Yoshiyama

    American journal of dentistry   16 ( 6 )   395 - 400   2003.12

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    PURPOSE: To investigate the effect of disodium dihydrogen ethylenediamine tetraacetate dihydrate (EDTA) conditioning prior to the application of adhesive systems on the bond strength of resin composite to dentin. METHODS: 80 bovine teeth were ground with 600-grit SiC paper to obtain flat dentin surfaces. Half of the specimens were conditioned with 0.5 mol EDTA aqueous solution (pH 7.4) for 60 seconds, water-rinsed and air-dried, and the other half were used without any treatment. The specimens were randomly divided in four groups of 10 each. The dentin surfaces were treated with each of two "all-in-one" adhesive systems (One-up Bond F, OB; Reactmer Bond, RB), a self-etching priming system (Clearfil SE Bond, SE), and a total-etch one-bottle bonding system (Single Bond, SB). For SB, the adhesive was applied on EDTA-conditioned dentin without H3PO4 etching. Then a layer of resin composite was placed and light-cured for 40 seconds. The tensile bond strength was measured and the resin-dentin interface was observed using a scanning electron microscope. RESULTS: The mean and standard deviation of tensile bond strength in MPa to ground dentin were 9.3+/-3.5/OB, 11.6+/-2.0/RB, 23.2+/-4.9/SE and 19.7+/-4.1/SB. Bond strengths to EDTA-conditioned dentin were 15.0+/-3.0/OB, 16.8+/-3.6/RB, 22.8+/-5.2/SE and 19.4+/-5.1/SB. Duncan's Multiple Range test revealed that the EDTA-conditioned dentin showed significantly higher tensile bond strength than the non-conditioned one for "all-in-one" adhesive systems (P < 0.05) but no significant difference was found for the self-etching priming and total-etch one-bottle bonding systems. At the resin-dentin interface, EDTA-conditioned specimens formed thicker hybrid layers than non-conditioned ones for all systems except for SB.

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  • Effect of drying methods on hybrid layer thickness. International journal

    Kousuke Itou, Yasuhiro Torii, Fumiko Oyama, Masahiro Yoshiyama, David H Pashley

    American journal of dentistry   16 ( 5 )   335 - 9   2003.10

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    PURPOSE: To evaluate the effect of drying methods used in scanning electron microscopy on the thickness of the hybrid layers created by several different adhesive systems. METHODS: A total etch dry bonding system, (Photobond), a three-step bonding adhesive system, (Scotchbond Multi-Purpose), a wet-bonding adhesive system (All-Bond 2) and a self-etching primer system (Mac Bond II) were used in this study. To permit measurement of the thickness of the hybrid layer, the resin-dentin interfaces were polished and etched briefly to remove polishing debris followed by immersion in 10% NaOCl for 4 hours. Half of the specimens in each group were subjected to fixation and critical-point drying followed by gold sputter-coating. The remaining specimens were allowed to air dry prior to gold sputter-coating. SEM observations were carried out to determine the structure and thickness of the hybrid layers. RESULTS: The thickness of hybrid layers were affected by the drying methods with the critical-point drying methods producing the thickest hybrid layers (P < 0.05). The thickest hybrid layers were created by Photobond, with Scotchbond Multi-Purpose and All-Bond 2 producing intermediate thickness hybrid layers, among the total etch systems. The thinnest hybrid layer among all of the adhesive systems was produced by the self-etching primer, Mac Bond II.

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  • Examination of factors influencing the evaluation of medical interviewing skills with objective structured clinical examination(OSCE).

    宮脇正一, 桑木徹, 倉谷豪, 宮本学, 吉田登志子, 荒川光, 鳥井康弘, 山本照子

    Orthodontic Waves   62 ( 4 )   239 - 252   2003.8

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    Language:Japanese   Publisher:(公社)日本矯正歯科学会  

    十分なキャリブレーションの後,臨床実習前の5年次の学生に対して,歯科矯正学に関連した説明課題を用いて医療面接の客観的臨床能力試験(OSCE)を行い,評価の信頼性とその評価に影響を及ぼす因子について検討した.評価者間ならびに模擬患者と評価者との間において,評価結果に有意差は認められなかった.「確認」と「指摘」を行うチェックリストの評価項目で,評価者間のほぼ完全な一致が認められた.チェックリストと概略評定間で有意の相関が認められた.チェックリストにおいて,矯正科所属の評価者の評価結果は他科所属の評価者のそれよりも有意に低かった.よって,医療面接のOSCEにおいて評価の信頼性を高めるためには,経験や知識のある評価者が十分なキャリブレーションを行った後,チェックリストを用いて多面的に受験者を評価するのが望ましいことが示唆された

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  • Effect of self-etching primer containing N-acryloyl aspartic acid on enamel adhesion. International journal

    Yasuhiro Torii, Kousuke Itou, Yoshihiro Nishitani, Masahiro Yoshiyama, Kunio Ishikawa, Kazuomi Suzuki

    Dental materials : official publication of the Academy of Dental Materials   19 ( 4 )   253 - 8   2003.6

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    Objectives: A previous study demonstrated that N-acryloyl aspartic acid (N-AAsp) aqueous solution is useful as a self-etching primer for dentin adhesion. The purpose of this study was to evaluate whether N-AAsp solution can be used for enamel etching, when compared with phosphoric acid.
    Methods: N-AAsp was synthesized by the reaction of DL-aspartic acid and acryloyl chloride. The experimental self-etching primers were prepared by dissolving N-AAsp in water at various concentrations up to 20 wt%. The tensile bond strength of resin to bovine enamel was measured after the enamel was treated with the N-AAsp primers. The 40 wt% H3PO4 was used for comparison. The treated enamel surfaces and the resin-enamel interfaces were also observed with a scanning electron microscope.
    Results: The tensile bond strength to enamel increased linearly with the increasing N-AAsp concentration and reached the same value as that to enamel etched with 40 wt% H3PO4 when N-AAsp concentration was 20 wt%, even though the etching ability of 20 wt% N-AAsp was inferior to 40 wt% H3PO4. Regardless of the concentration of N-AAsp, the bond strength to,enamel was the same as that to dentin reported in our previous study.
    Significance: The 20 wt% N-AAsp aqueous solution showed enamel bonding equivalent to 40 wt% H3PO4 in addition to the advantage of eliminating the rinse step with water. Based on the results obtained in this study along with those obtained in a previous study, it was concluded that 20 wt% N-AAsp aqueous solution is a promising self-etching primer to simultaneously treat enamel and dentin. (C) 2003 Academy of Dental Materials. Published by Elsevier Science Ltd. All rights reserved.

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  • Resin adhesion to carious dentin. International journal

    Masahiro Yoshiyama, Franklin R Tay, Yasuhiro Torii, Yoshihiro Nishitani, Junichi Doi, Kousuke Itou, Bernard Ciucchi, David H Pashley

    American journal of dentistry   16 ( 1 )   47 - 52   2003.2

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    PURPOSE: To investigate the microtensile bond strength (microTBS) of a self-etching priming adhesive system to normal, caries-affected and caries-infected dentin, and to observe the ultrastructure of the resin-dentin interface by transmission electron microscopy (TEM). MATERIALS AND METHODS: Twelve extracted human molar teeth with deep occlusal caries were stained with caries detector solution and ground flat occlusally. The red-stained soft dentin was classified as caries-infected. The surrounding discolored dentin was classified as caries-affected dentin. The surrounding normal dentin served as a control. The entire flat surface was bonded with Clearfil Liner Bond 2V (CV) and covered with resin composite to form a composite crown 5 mm high. One day later the specimens were serially sectioned vertically into multiple slabs 0.8 mm thick. Under microscopic observation, the specimens were divided into normal or caries-infected or caries-affected dentin. These regions were isolated by cutting away the remaining dentin to form hour-glass shapes with the smallest surface area at the test site. After measuring the areas, the specimens were fixed to a microtensile tester and pulled under tension to failure. Additional slabs that were not used for bond strength tests were processed for TEM. Bond strength data were analyzed by Kruskal-Wallis one-way ANOVA and Student-Newman-Keuls multiple comparisons. RESULTS: The microTBS of CV to normal, caries-affected and caries-infected dentin were 45 +/- 10 MPa, 30 +/- 10 MPa, 10 +/- 5 MPa, respectively. TEM images showed that CV formed thin hybrid layers that were less than 1 microm thick in normal dentin, but that were between 6-8 microm thick in caries-affected dentin. Bacteria were only sparsely observed in the dentin tubules of bonded caries-affected dentin. However, in caries-infected dentin, an unusual interface was seen in which carious bacteria within disorganized non-banded collagen fibrils could be seen embedded by the adhesive. The hybrid layer in caries-infected dentin was found to be 30-60 microm thick.

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  • Effect of self-etching primer containing N-acryloyl aspartic acid on enamel adhesion.

    Torii Y, Itou K, Nishitani Y, Yoshiyama M, Ishikawa K, Suzuki K

    Dent Mater   2003

  • 岡山大学歯学部臨床実習直前学生に対するOSCEの試み--学生アンケート調査からの評価--.

    鳥井康弘, 吉田登志子, 荒川 光, 若狭 享, 宮脇正一, 新井英雄, 塚本剛一, 福永城司, 長塚 仁, 中村浩彰, 白井 肇, 糀谷 淳, 高木 愼, 岸本悦央, 嶋田昌彦, 山本敏男, 吉山昌宏, 鈴木一臣, 永井教之

    岡山歯学会雑誌   2003

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  • Effect of fluoride-releasing adhesive system on decalcified dentin.

    Itota T, Torii Y, Nakabo S, Tashiro Y, Konishi N, Nagamine M, Yoshiyama M

    J Oral Rehabil   2003

  • Effect of fluoride-releasing adhesive system on decalcified dentin.

    Itota T, Torii Y, Nakabo S, Tashiro Y, Konishi N, Nagamine M, Yoshiyama M

    J Oral Rehabil   2003

  • Confocal laser scanning microscopic analysis of early plaque formed on resin composite and human enamel.

    Konishi N, Torii Y, Kurosaki A, Takatsuka T, Itota T, Yoshiyama M

    J Oral Rehabil   2003

  • Effect of fluoride application on tensile bond strength of self-etching adhesive systems to demineralized dentin. International journal

    Toshiyuki Itota, Yasuhiro Torii, Satoshi Nakabo, Masahiro Yoshiyama

    The Journal of prosthetic dentistry   88 ( 5 )   503 - 10   2002.11

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    Statement of problem. It has been reported that the bond strength of composite to demineralized dentin is lower than that to sound dentin. This can be a problem in the success of so-called sealed restorations. Purpose. The aim of this study was to evaluate the effect of fluoride application on the tensile bond strength of self-etching adhesive systems to demineralized dentin. Material and methods. One hundred twenty extracted bovine incisors were ground flat with 600-grit silicone carbide paper. Ninety teeth were then immersed in acetate buffer (pH 4.0) to form demineralized dentin. These teeth were randomly divided into 3 groups of 30 each: surfaces treated with fluoride solution (Group NF), surfaces treated with fluoride solution followed by a water rinse (Group RF), and control surfaces with no pretreatment (Group C). The remaining 30 teeth comprised a group with normal dentin surfaces (Group S). Each group was further divided into 3 subgroups of 10 each to test the bond strength test of Clearfil SE Bond, Unifil Bond, and Mac-Bond II. Tensile bond strengths (in MPa) were measured with a universal testing machine at a crosshead speed of 0.5 mm/min. Mean bond strengths were analyzed by 2-way analysis of variance and Fisher's PLSD (P = .05). SEM observations of the surfaces before and after priming and at resin-dentin interfaces in each group were performed. Elemental analysis of the dentin surfaces before priming was also carried out. Results. The bond strengths of the adhesives to demineralized dentin in Groups NF, RF, and C were significantly lower than that of the normal dentin in Group S (P &lt
    .05). The mean bond strengths of the 3 adhesives in Group NF were higher than those in Groups RF and C, but a significant difference was observed only when Clearfil SE Bond was used (P &lt
    .05). In SEM images the open dentinal tubules on the surface and the resin tag formation at the resin-dentin interface were apparent in Group NF but were not observed in Groups RF and C. On elemental analysis, considerable amounts of fluoride and calcium were detected in the surfaces of Group NF. Conclusion. Within the limitations of this study, the surface treatment with fluoride solution supported the resin tag formation at the resin-dentin interface and slightly improved the bond strength of the self-etching adhesive systems tested to demineralized dentin. This result indicated that the fluoride treatment to demineralized dentin might contribute to the success of the sealed restoration. Copyright © 2002 by The Editorial Council of The Journal of Prosthetic Dentistry.

    DOI: 10.1067/mpr.2002.129079

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  • Effect of phosphoric acid etching prior to self-etching primer application on adhesion of resin composite to enamel and dentin. International journal

    Yasuhiro Torii, Kousuke Itou, Yoshihiro Nishitani, Kunio Ishikawa, Kazuomi Suzuki

    American journal of dentistry   15 ( 5 )   305 - 8   2002.10

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    PURPOSE: To investigate the effect of phosphoric acid etching prior to the application of self-etching primer on the adhesion of resin composite to tooth substrates. MATERIALS AND METHODS: Bovine teeth were randomly divided in four groups of 20 samples each. Tooth surface conditions were as follows: Group 1: enamel ground with 600-grit SiC paper; Group 2: ground enamel was etched with 35% phosphoric acid gel for 15 seconds, water-rinsed and completely dried; Group 3: ground dentin; Group 4: dentin etched using the same method as Group 2. The samples in each group were divided in two subgroups of 10 each. UniFil Bond (UB) and Clearfil SE Bond (SE) were applied as adhesive systems with self-etching primers, and a layer of resin composite (AP-X) was placed and light-cured for 40 seconds. The tensile bond strengths (TBS) were measured and the resin-tooth interfaces were observed with scanning electron microscopy. RESULTS: The mean TBS values were 11.2 MPa (Group 1-UB), 14.3 MPa (Group 1-SE), 16.3 MPa (Group 2-UB), 20.5 MPa (Group 2-SE), 13.4 MPa (Group 3-UB), 16.7 MPa (Group 3-SE), 9.3 MPa (Group 4-UB) and 12.6 MPa (Group 4-SE). Two-way ANOVA and Scheffe's F test showed that the enamel etching significantly increased the TBS values but dentin etching significantly decreased the TBS values.

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  • Effects of fluoride release from bis-GMA/TEGDMA resin regulated by gamma-methacryloxypropyltrimethoxysilane on demineralization of bovine enamel. International journal

    Satoshi Nakabo, Yasuhiro Torii, Toshiyuki Itota, Kunio Ishikawa, Koji Miyazaki, Kazuomi Suzuki, Masahiro Yoshiyama

    Biomaterials   23 ( 16 )   3503 - 8   2002.8

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    We previously demonstrated that fluoride release from resins could be regulated by the polysiloxane coating of the fluoride additives. The present study investigated the effects of regulated fluoride release from resin oil enamel demineralization in vitro. Bovine enamel cavities were restored with bis-GMA/TEGDMA resins containing 50wt% NaF powders treated with or without gamma-methacryloxypropyltrimethoxysilane. Specimens were immersed in distilled water that was changed daily to measure the amount of fluoride released over 40 days, and thereafter Subjected to pH-cycling. Microradiographic observations were performed to determine total mineral loss (DeltaZ) and lesion depth (Ld) on the enamel. In addition, fluorine distribution was analyzed using EPMA. The resin containing untreated NaF exhibited high-rate and short-term fluoride release, whereas the resin containing treated NaF released low concentrations of fluoride over a longer period. The former showed high fluorine Uptake in the adjacent enamel. In contrast, the latter showed high fluorine uptake not only in the adjacent enamel, but also in a wider area of enamel surface. The latter also showed lower AZ and Ld values in the surrounding enamel, indicating a high inhibitory effect on caries formation. Therefore. it is Suggested that regulated fluoride release front the resin based on polysiloxane coating is effective in preventing caries formation. (C) 2002 Elsevier Science Ltd. All rights reserved.

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  • Enamel tensile bond strength and morphology of resin-enamel interface created by acid etching system with or without moisture and self-etching priming system

    Y Torii, K Itou, R Hikasa, S Iwata, Y Nishitani

    JOURNAL OF ORAL REHABILITATION   29 ( 6 )   528 - 533   2002.6

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    The purpose of this study was to estimate the effect of three types of different adhesive systems on enamel adhesion. Scotchbond Multi-Purpose (MP) as a traditional system, Single Bond (SB) as a wet-bonding system and Clearfil SE Bond (SE) and Unifil Bond (UB) as self-etching priming systems were used. Bovine enamel was treated with each system and tensile bond strength (TBS) of resin to the enamel was measured. The conditioned enamel surfaces and resin-enamel interfaces were also morphologically observed with scanning electron microscope (SEM). The mean TBS for MP, SB, SE and UB were 15.3, 13.7, 14.3 and 11.6 MPa, respectively. There was no significant difference in mean TBS among all products but the traditional system showed the most stable TBS. In SEM observations, self-etching primer created a weaker etched pattern on the enamel surface than phosphoric acid. At the resin-enamel interfaces, thick tag-like extensions penetrated into the enamel etched with phosphoric acid regardless of using the wet-bonding technique, while self-etching primer created thin lamina-like resin penetrations. These results indicate that the traditional system with phosphoric acid etching exhibits the most stable enamel adhesion although the enamel-bonding promoting abilities of these adhesive systems are equivalent to each other.

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  • Regulation of NaF release from bis-GMA/TEGDMA resin using gamma-methacryloxypropyltrimethoxysilane. International journal

    Satoshi Nakabo, Yasuhiro Torii, Toshiyuki Itota, Kunio Ishikawa, Kazuomi Suzuki

    Dental materials : official publication of the Academy of Dental Materials   18 ( 1 )   81 - 7   2002.1

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    OBJECTIVES: The aim of this study was to evaluate the feasibility of regulation of NaF release from bis-GMA/TEGDMA resin using gamma-methacryloxypropyltrimethoxysilane (gamma-MPTS). METHODS: NaF powder was treated with gamma-MPTS to form a polysiloxane layer on its surface. The morphology and the composition of the NaF powder treated with gamma-MPTS were evaluated using scanning electron microscopy, infrared spectroscopy, contact angle measurement and X-ray photoelectron spectroscopy. Bis-GMA/TEGDMA resin containing 50 wt% NaF powder was prepared as a model resin and immersed in distilled water at 37 degrees C, and the amount of fluoride released from the resin was measured using a fluoride electrode. The mechanical strength in terms of diametral tensile strength before and after fluoride release was also measured, and statistically analyzed using one-way factorial ANOVA and Fisher's PLSD method. RESULTS: NaF powder was covered with hydrophobic gamma-MPTS delivered polysiloxane. A larger amount of fluoride was released at the initial stage from the resin containing NaF treated with no gamma-MPTS. However, fluoride release terminated in a relatively shorter period. In contrast, we observed a smaller amount of fluoride released for a longer period from the resin containing NaF treated with gamma-MPTS. SIGNIFICANCE: We found that gamma-MPTS treatment is useful for the regulation of NaF release from bis-GMA/TEGDMA resin. The mechanism of slow NaF release may be the formation of a hydrophobic polysiloxane layer on the surface of NaF powder and resulting slow water diffusion to NaF powder.

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  • ワンステップ型接着システムの象牙質接着性に及ぼす前処理の効果

    暈 理恵, 小山史子, 岩田修一, 伊東孝介, 佐藤公平, 鳥井康弘, 吉山昌宏

    日本歯科保存学雑誌   2002

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  • 齲蝕病巣下のDentin/Pulp Complexにおける病理組織学的変化について.

    糸田俊之, 田代陽子, 鳴神智子, 黒崎昭夫, 高畑安光, 仲保 聡, 西谷佳浩, 高務朋将, 清水洋利, 伊澤俊次, 小西法文, 鳥井康弘, 吉山昌宏

    岡山歯学会雑誌   2002

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  • Regulation of fluoride ion release from Na2SiF6 contained in resin based on hydrophobic siloxane layer coating.

    Nakabo S, Torii Y, Itota T, Yoshiyama M, Ishikawa K, Suzuki K

    J Oral Rehabil   2002

  • Inhibition of artificial secondary caries by fluoride-releasing adhesives on root dentin.

    Itota T, Nakabo S, Iwai Y, Konishi N, Nagamine M, Torii Y

    J Oral Rehabil   2002

  • ワンステップ型接着システムの象牙質接着性に及ぼす前処理の効果.

    暈 理恵, 小山史子, 岩田修一, 伊東孝介, 佐藤公平, 鳥井康弘, 吉山昌宏

    日本歯科保存学雑誌   2002

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  • Regulation of NaF release from bis-GMA/TEGDMA resin using g-methacryloxypropyltrimethoxysilane.

    Nakabo S, Torii Y, Itota T, Ishikawa K, Suzuki K

    Dent Mater   2002

  • Bactericidal effect of dentin primer containing antibacterial monomer methacryloyloxydodecylpyridinium bromide (MDPB) against bacteria in human carious dentin

    S Imazato, Y Torii, T Takatsuka, K Inoue, N Ebi, S Ebisu

    JOURNAL OF ORAL REHABILITATION   28 ( 4 )   314 - 319   2001.4

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    The aim of this study was to investigate the bactericidal effect of a dentin primer incorporating the antibacterial monomer 12-methacryloyloxydodecylpyridinium bromide (MDPB) against bacteria in human dentinal carious lesions. To evaluate the antibacterial activity of MDPB against anaerobes, the minimum inhibitory concentration (MIC) and the minimum bactericidal concentration (MBC) against obligate anaerobes and facultative anaerobic strains of lactobacilli were determined. Bacteria were recovered from carious dentin samples obtained from the teeth of patients, and the bactericidal activities of the experimental primer containing 5% MDPB and three commercially available primers were compared by counting the number of viable cells after contact with diluted solutions of each primer for 30 s. MDPB showed strong antibacterial activity against anaerobes, the MIC and MBC values ranging from 3.9 to 31.3 mug mL(-1) and 15.6-125 mug mL(-1), respectively. Experimental primer containing MDPB was the most bactericidal among the materials tested (ANOVA, Fisher's PLSD test, P &lt; 0.05) and was able to kill the bacteria completely even when diluted 40 times, while the three commercial products exhibited little activity at 40 times dilution. These results indicate that incorporation of MDPB into dentin primer could be beneficial for eliminating the residual bacteria in cavities.

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  • Inhibition of artificial secondary caries in root by fluoride-releasing restorative materials

    Y Torii, T Itota, M Okamoto, S Nakabo, M Nagamine, K Inoue

    OPERATIVE DENTISTRY   26 ( 1 )   36 - 43   2001.1

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    This investigation evaluated the fluoride-releasing properties of various fluoride-releasing restorative materials, including resin-modified glass-ionomer cements (Fuji ionomer TypeII LC, Photac-Fil Aplicap, Vitremer), compomers (Ionosit FIL, Compoglass, Dyract) and fluoride-releasing resin composites (Heliomolar radiopaque, Degufill mineral), The study also estimated the effects of those materials on the inhibition of artificial secondary caries around restorations using a bacterial caries-inducing system. The amount of fluoride released from the materials in deionized water was measured every one week for 10 weeks. Class V cavities with the gingival margin located in the root were prepared in extracted human premolars and restored with each of the materials. The restored teeth were incubated in the bacterial artificial caries chamber, and the artificial lesion created around the restoration was observed microradiographically. The resin-modified glass-ionomer cements released the largest amount of fluoride and created a thick radio-opaque zone in the artificial lesion along the restoration-dentin interface. These results indicated that the fluoride-releasing restorative materials have the potential to inhibit secondary caries formation around restorations. Resin-modified glass-ionomer cements presented a particularly strong effect, compared with compomers and fluoride-releasing resin composites.

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  • Effects of Polysiloxane Coating of NaF on the Release Profile of Fluoride Ion from Bis-GMA/TEGDMA Resin Containing NaF

    Satoshi Nakabo, Yasuhiro Torii, Toshiyuki Itota, Masahiro Yoshiyama, Kunio Ishikawa, Kazuomi Suzuki

    Dental Materials Journal   20 ( 1 )   53 - 62   2001

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    The aim of this study was to regulate fluoride release from restorative resin containing NaF using N-(β-aminoethyl)-γ-aminopropylmethyldimethoxysilane (AMMS) and evaluate factors that regulate fluoride release from the resin. ESCA analysis, FT-IR measurements along with SEM observations demonstrated that a polysiloxane layer was formed on the surface of NaF treated with AMMS. Bis-GMA/TEGDMA resin containing NaF powder treated with AMMS released lower concentrations of fluoride for longer periods when compared with that containing untreated NaF. However, AMMS treatment of NaF was less effective for the regulation of fluoride released from the resin than γ-methacryloxypropyltrimethoxysilane (γ-MPTS) treatment, despite its higher hydrophobic polysiloxane layer formation. These findings may have been caused by the higher density of polysiloxane prepared with γ-MPTS than that prepared with AMMS. The present findings suggested, therefore, that alkoxysilane should be chosen based not only on hydrophobicity but also the density of polysiloxane to effectively regulate fluoride release from the restorative resin containing NaF.

    DOI: 10.4012/dmj.20.53

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  • 新しいう蝕治療を求めて-シールド・レストレーションの可能性

    吉山昌宏, 西谷佳浩, 土居潤一, 山田登美子, 鳥井康弘

    The Journal of Dental Engineering   136, 27-30   2001

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  • 歯科保存領域の感染症に対する抗菌薬アジスロマイシン(ジスロマックィ)の臨床成績

    鳥井康弘, 永峰道博, 吉山昌宏

    デンタルダイヤモンド   2001

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  • Effect of adhesives on the inhibition of secondary caries around compomer restorations

    Itota, T, Nakabo, S, Iwai, Y, Konishi, N, Nagamine, M, Torii, Y, Yoshiyama, M

    Operative Dentistry   2001

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  • Alteration of odontoblast osteonectin expression following dental cavity preparation

    Itota, T, Nishitani, Y, Sogawa, N, Sogawa, C, Konishi, N, Torii, Y

    Archives of Oral Biology   2001

  • MIを生かす接着材料の新展開 接着の最新動向から

    吉山昌宏, 鳥井康弘, 糸田俊之, 西谷佳浩

    別冊クインテッセンス Year Book 2001   22-28   2001

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  • 抗菌モノマーMDPB配合試作接着システムの齲蝕象牙質中の嫌気性菌に対する抗菌効果について

    高務朋将, 石尾富貴子, 黒崎昭夫, 高畑安光, 小西法文, 佐藤公平, 鳥井康弘, 吉山昌宏

    日本歯科保存学雑誌   2001

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  • フロアブルレジンの根面う蝕象牙質への接着性

    千頭佳奈, 土居潤一, 山田登美子, 西谷佳浩, 伊東孝介, 鳥井康弘, 吉山昌宏

    接着歯学   2001

  • 窩洞形成時疼痛の中枢抑制機構の解明

    伊澤俊次, 土居潤一, 山田登美子, 仲保 聡, 西谷佳浩, 高務朋将, 伊東孝介, 糸田俊之, 小西法文, 永峰道博, 鳥井康弘, 吉山昌宏

    日本歯科保存学雑誌   2001

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  • Effect of priming time on tensile bond strength to bovine teeth and morphological structure of interfaces created by self-etching primers

    Itou, K, Torii, Y, Takimura, T, Chikami, K, Ishikawa, K, Suzuki, K

    International Journal of Prosthodontics   2001

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  • ハイブリッド型硬質レジン「エステニア」インレーの臨床経過

    鳥井康弘, 吉山昌宏

    The Journal of Dental Engineering   2001

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  • フッ素徐放性接着システムによる脱灰象牙質の再石灰化

    糸田俊之, 岩井陽一郎, 岡本美々子, 田代陽子, 仲保 聡, 西谷佳浩, 永峰道博, 鳥井康弘, 吉山昌宏

    日本歯科保存学雑誌   2001

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  • Effect of self-etching primers containing N-acryloyl aspartic acid on dentin adhesion

    Kousuke Itou, Yasuhiro Torii, Yoshihiro Nishitani, Kunio Ishikawa, Kazuomi Suzuki, Kiyoshi Inoue

    Journal of Biomedical Materials Research   51 ( 4 )   569 - 574   2000.9

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    The purpose of this study was to evaluate the feasibility of aspartic acid derivative, N-acryloyl aspartic acid (N-AAsp) when used as a self- etching primer prior to the application of a commercial bonding agent containing 10-methacryloxydecyl dihydrogen phosphate. N-AAsp was synthesized by the reaction of DL-aspartic acid and acryloyl chloride. N-AAsp can be dissolved in water up to 25 wt % and can adequately remove the smear layer. When 20 wt % N-AAsp was applied as a self-etching primer, the tensile bonding strength of resin composite to dentin doubled to 16.0 MPa compared with that of the nonetching group or the 40 wt % H3PO4 etching/water rinse group. Scanning electron microscopic observations revealed that the formation of the hybrid layer at the interface between the resin composite and dentin and the thickness of the hybrid layer increased with N-AAsp concentration. The hybrid layer in the specimens treated with 20 wt % N-AAsp aqueous solution presented a uniform structure, whereas those treated with 5 wt % N-AAsp solution showed a porous structure. We conclude that 20 wt % N-AAsp aqueous solution has good potential value as a self-etching primer. (C) 2000 John Wiley and Sons, Inc.

    DOI: 10.1002/1097-4636(20000915)51:4<569::AID-JBM4>3.0.CO;2-R

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  • Effect of self-etching primers containing N-acryloyl aspartic acid on dentin adhesion

    Kousuke Itou, Yasuhiro Torii, Yoshihiro Nishitani, Kunio Ishikawa, Kazuomi Suzuki, Kiyoshi Inoue

    Journal of Biomedical Materials Research   51 ( 4 )   569 - 574   2000.9

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    The purpose of this study was to evaluate the feasibility of aspartic acid derivative, N-acryloyl aspartic acid (N-AAsp) when used as a self- etching primer prior to the application of a commercial bonding agent containing 10-methacryloxydecyl dihydrogen phosphate. N-AAsp was synthesized by the reaction of DL-aspartic acid and acryloyl chloride. N-AAsp can be dissolved in water up to 25 wt % and can adequately remove the smear layer. When 20 wt % N-AAsp was applied as a self-etching primer, the tensile bonding strength of resin composite to dentin doubled to 16.0 MPa compared with that of the nonetching group or the 40 wt % H3PO4 etching/water rinse group. Scanning electron microscopic observations revealed that the formation of the hybrid layer at the interface between the resin composite and dentin and the thickness of the hybrid layer increased with N-AAsp concentration. The hybrid layer in the specimens treated with 20 wt % N-AAsp aqueous solution presented a uniform structure, whereas those treated with 5 wt % N-AAsp solution showed a porous structure. We conclude that 20 wt % N-AAsp aqueous solution has good potential value as a self-etching primer. (C) 2000 John Wiley and Sons, Inc.

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  • Effect of self-etching primers containing N-acryloyl aspartic acid on dentin adhesion

    K Itou, Y Torii, Y Nishitani, K Ishikawa, K Suzuki, K Inoue

    JOURNAL OF BIOMEDICAL MATERIALS RESEARCH   51 ( 4 )   569 - 574   2000.9

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    The purpose of this study was to evaluate the feasibility of aspartic acid derivative, N-acryloyl aspartic acid (N-AAsp) when used as a self-etching primer prior to the application of a commercial bonding agent containing 10-methacryloxydecyl dihydrogen phosphate. N-AAsp was synthesized by the reaction of DL-aspartic acid and acryloyl chloride. N-AAsp can be dissolved in water up to 25 wt % and can adequately remove the smear layer. When 20 wt % N-AAsp was applied as a self-etching primer, the tensile bonding strength of resin composite to dentin doubled to 16.0 MPa compared with that of the nonetching group or the 40 wt % H3PO4 etching/water rinse group. Scanning electron microscopic observations revealed that the formation of the hybrid layer at the interface between the resin composite and dentin and the thickness of the hybrid layer increased with N-AAsp concentration. The hybrid layer in the specimens treated with 20 wt % N-AAsp aqueous solution presented a uniform structure, whereas those treated with 5 wt % N-AAsp solution showed a porous structure. We conclude that 20 wt % N-AAsp aqueous solution has good potential value as a self-etching primer. (C) 2000 John Wiley & Sons, Inc.

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  • Osteopontin-immunoreactive primary sensory neurons in the rat spinal and trigeminal nervous systems

    Hiroyuki Ichikawa, Toshiyuki Itota, Yoshihiro Nishitani, Yasuhiro Torii, Kiyoshi Inoue, Tomosada Sugimoto

    Brain Research   863 ( 1-2 )   276 - 281   2000.4

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    The distribution of osteopontin-immunoreactive (OPN-ir) primary sensory neurons was investigated in the spinal and trigeminal nervous systems. The dorsal root ganglion (DRG), trigeminal ganglion (TG) and mesencephalic trigeminal tract nucleus (Mes5) contained abundant OPN-ir neuronal cell bodies and their axons. Twenty-five and 31% of neurons were immunoreactive for this protein in the DRG and TG, respectively. These neurons were mostly large. A half (54%) of DRG neurons &gt
    1200 μm2 and 9% of those in the range 600-1200 μm2 showed the immunoreactivity (ir). DRG neurons &lt
    600 μm2 were mostly devoid of OPN-ir (2%)
    31% of TG neurons exhibited the ir. In the TG, a half (49%) of neurons &gt
    800 μm2 showed the ir and 21% of those in the range 400-800 μm2 were immunoreactive for this protein. TG neurons &lt
    400 μm2 were mostly devoid of OPN-ir (2%). Virtually all (99%) Mes5 primary sensory neurons exhibited the ir. Muscle spindles in the soleus and masseter muscles contained OPN-ir spiral axon terminals. In the hard palate and incisor periodontal ligament, unencapsulated corpuscular endings exhibited the ir. The co-expression of OPN with parvalbumin and calcitonin gene-related peptide (CGRP) was also examined in the DRG and TG. In the DRG, virtually all (97%) OPN-ir neurons exhibited parvalbumin-ir. Conversely, 66% of parvalbumin-ir DRG neurons co-expressed OPN-ir. In the TG, 81% of OPN-ir neurons exhibited parvalbumin-ir and 69% of parvalbumin-ir ones showed OPN-ir. Virtually all OPN-ir DRG and TG neurons were devoid of CGRP-ir. The present study indicates that OPN-ir primary sensory neurons in the DRG and Mes5 are spinal and trigeminal proprioceptors. OPN-ir TG neurons appear to include low-threshold mechanoreceptors. Copyright (C) 2000 Elsevier Science B.V.

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  • Osteopontin-immunoreactive primary sensory neurons in the rat spinal and trigeminal nervous systems

    Hiroyuki Ichikawa, Toshiyuki Itota, Yoshihiro Nishitani, Yasuhiro Torii, Kiyoshi Inoue, Tomosada Sugimoto

    Brain Research   863 ( 1-2 )   276 - 281   2000.4

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    The distribution of osteopontin-immunoreactive (OPN-ir) primary sensory neurons was investigated in the spinal and trigeminal nervous systems. The dorsal root ganglion (DRG), trigeminal ganglion (TG) and mesencephalic trigeminal tract nucleus (Mes5) contained abundant OPN-ir neuronal cell bodies and their axons. Twenty-five and 31% of neurons were immunoreactive for this protein in the DRG and TG, respectively. These neurons were mostly large. A half (54%) of DRG neurons &gt
    1200 μm2 and 9% of those in the range 600-1200 μm2 showed the immunoreactivity (ir). DRG neurons &lt
    600 μm2 were mostly devoid of OPN-ir (2%)
    31% of TG neurons exhibited the ir. In the TG, a half (49%) of neurons &gt
    800 μm2 showed the ir and 21% of those in the range 400-800 μm2 were immunoreactive for this protein. TG neurons &lt
    400 μm2 were mostly devoid of OPN-ir (2%). Virtually all (99%) Mes5 primary sensory neurons exhibited the ir. Muscle spindles in the soleus and masseter muscles contained OPN-ir spiral axon terminals. In the hard palate and incisor periodontal ligament, unencapsulated corpuscular endings exhibited the ir. The co-expression of OPN with parvalbumin and calcitonin gene-related peptide (CGRP) was also examined in the DRG and TG. In the DRG, virtually all (97%) OPN-ir neurons exhibited parvalbumin-ir. Conversely, 66% of parvalbumin-ir DRG neurons co-expressed OPN-ir. In the TG, 81% of OPN-ir neurons exhibited parvalbumin-ir and 69% of parvalbumin-ir ones showed OPN-ir. Virtually all OPN-ir DRG and TG neurons were devoid of CGRP-ir. The present study indicates that OPN-ir primary sensory neurons in the DRG and Mes5 are spinal and trigeminal proprioceptors. OPN-ir TG neurons appear to include low-threshold mechanoreceptors. Copyright (C) 2000 Elsevier Science B.V.

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  • 象牙質知覚過敏抑制剤で処理した象牙質に対する口腔レンサ球菌の初期付着性について

    小西法文, 太田泰寛, 高務朋将, 鳥井康弘, 井上 清

    日本歯科保存学雑誌   2000

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  • 根面う蝕へのシールド・レストレーションの応用:根面う蝕象牙質へのレジン接着性

    吉山昌宏, 伊東孝介, 西谷佳浩, 仲保 聡, 土居潤一, 山田登美子, 鳥井康弘, 松尾敬志, 浦山明久, 木持 健

    接着歯学   2000

  • Adhesion in vitro of Oral Streptococci to Porcelain, Composite Resin Cement and Human Enamel

    Tomomasa Takatsuka, Norifumi Konishi, Satoshi Nakabo, Takeshi Hashimoto, Yasuhiro Torii, Masahiro Yoshiyama

    Dental Materials Journal   19 ( 4 )   363 - 372   2000

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    We investigated the initial adhesion in vitro of oral streptococci to porcelain inlays. Four strains of streptococci, Streptococcus mitis NCTC12261, Streptococcus oralis ATCC9811, Streptococcus sanguis ATCC10556 and Streptococcus sobrinus OMZ176, were used in this study. The disc specimens were made of porcelain, composite resin cement and human enamel. These specimens, with or without a saliva-coat, were immersed in a suspension of each streptococci strain at 37°C for 1 hr, and the numbers of cells adhering to specimens were counted after staining. The saliva-coat significantly decreased the numbers of adhering cells in all strains tested (t-test, p&lt
    0.05). The adhesion to the porcelain and resin cements could be explained by a thermodynamic approach, although the adhesion to enamel could not be explained. These results indicated the possibility that the mechanism is different in initial adhered strains of streptococci between enamel and dental restorative materials.

    DOI: 10.4012/dmj.19.363

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  • Osteopontin-immunoreactive primary sensory neurons in the rat spinal and trigeminal nervous systems

    Ichikawa, H, Itota, T, Nishitani, Y, Torii, Y, Inoue, K, Sugimoto, T

    Brain Research   2000

  • Morphological changes of enamel surfaces adjacent to restorations by demineralization

    Nagamine, M, Henmi, C, Itota, T, Torii, Y, Marshall, G.W, Staninec, M, Yoshiyama, M

    The Electronic Journal for Dentistry   2000

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  • Osteocalcin-immunoreactive primary sensory neurons in the rat spinal and trigeminal nervous systems

    Hiroyuki Ichikawa, Toshiyuki Itota, Yasuhiro Torii, Kiyoshi Inoue, Tomosada Sugimoto

    Brain Research   838 ( 1-2 )   205 - 209   1999.8

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    Osteocalcin-immunoreactivity (OC-ir) was examined in spinal and trigeminal primary sensory neurons of the adult rat. Sixteen percent of dorsal root ganglion (DRG) neurons were immunoreactive (ir) for this protein. These neurons were mostly large and measured 594-4583 μm2 (mean ± S.D. = 2243 ±748 μm2). Thirty-four percent of DRG neurons &gt
    1200 μm2 and 4% of those in the range 600-1200 μm2 showed the ir. Virtually all DRG neurons &lt
    600 μm2 were devoid of OC-ir. In the trigeminal ganglion (TG), 25% of neurons exhibited the ir. Such neurons were of various sizes (range = 156- 2825 μm2, mean ± S.D.= 1234 ± 543 ±m2). Forty-five percent of TG neurons &gt
    800 μm2 and 6% of those &lt
    400 μm2 were immunoreactive for this protein. Twelve percent of TG neurons in the range 400-800 μm2 showed the it. In the mesencephalic trigeminal tract nucleus (Mes5), 63% of primary sensory neurons contained OC-ir. Virtually all OC-ir DRG and Mes5 neurons co- expressed parvalbumin-ir but not CGRP-ir. On the other hand, only 31% of OC- ir neurons co-expressed parvalbumin-ir and 10% co-expressed CGRP-ir in the TG. The present study indicates that DRG and Mes5 primary sensory neurons co- expressing OC- and parvalbumin-irs are spinal and trigeminal proprioceptors. OC-ir TG neurons which co-express parvalbumin- and CGRP-irs appear to include low-threshold mechanoreceptors and nociceptors, respectively.

    DOI: 10.1016/S0006-8993(99)01710-2

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  • Structure and enzymatic properties of genetically truncated forms of the water-insoluble glucan-synthesizing glucosyltransferase from Streptococcus sobrinus

    N Konishi, Y Torii, T Yamamoto, A Miyagi, H Ohta, K Fukui, S Hanamoto, H Matsuno, H Komatsu, T Kodama, E Katayama

    JOURNAL OF BIOCHEMISTRY   126 ( 2 )   287 - 295   1999.8

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    Glucosyltransferase-I (GTF-I: 175 kDa) of a cariogenic bacterium, Streptococcus sobrinus 6715, mediates the conversion of water-soluble dextran (alpha-1,6-glucan) into a water-insoluble form by making numerous alpha-1,3-glucan branches along the dextran chains with sucrose as the glucosyl donor, The structures and catalytic properties were compared for two GTF-I fragments, GTF-I' (138 kDa) and GS (110 kDa). Both lack the N-terminal 84 residues of GTF-I. While GTF-I' still contains four of the six C-terminal repeats characteristic of streptococcal glucosyltransferases, GS lacks all of them, Electron microscopy of negatively stained samples indicated a double-domain structure for GTF-I', consisting of a spherical head with a smaller spherical tail, which was occasionally seen as a long extension. GS was seen just as the head portion of GTF-I', In the absence of dextran, both fragments simply hydrolyzed sucrose with similar K-m and k(cat) values at low concentrations (&lt;5 mM), At higher sucrose concentrations (&gt;10 mM), however, GTF-I' exhibited glucosyl transfer activity to form insoluble alpha-1,3-glucans. So did GS, but less efficiently. Dextran increased the rate and efficiency of the glucosyl transfer by GTF-I'. On removal of the C-terminal repeats of GTF-I' by mild trypsin treatment, this dextran-stimulated transfer was completely lost and the dextran-independent transfer became less efficient. These results indicate that the N-terminal two-thirds of the GTF-I sequence are organized as a structurally and functionally independent domain to catalyze not only sucrose hydrolysis but also glucosyl transfer to form alpha-1,3-glucan chains, although not efficiently; the C-terminal repeat increases the efficiency of the intrinsic glucosyl transfer by the N-terminal domain as well as rendering the whole molecule primer-dependent for far more efficient insoluble glucan synthesis.

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  • Structure and enzymatic properties of genetically truncated forms of the water-insoluble glucan-synthesizing glucosyltransferase from Streptococcus sobrinus

    Norifumi Konishi, Yasuhiro Torii, Tatsuo Yamamoto, Atsushi Miyagi, Hiroyuki Ohta, Kazuhiro Fukui, Satoshi Hanamoto, Hideki Matsuno, Hideyuki Komatsu, Takao Kodama, Eisaku Katayama

    Journal of Biochemistry   126 ( 2 )   287 - 295   1999

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    Language:English   Publisher:Japanese Biochemical Society  

    Glucosyltransferase-I (GTF-I: 175 kDa) of a cariogenic bacterium, Streptococcus sobrinus 6715, mediates the conversion of water-soluble dextran (α-1,6-glucan) into a water-insoluble form by making numerous α-1,3-glucan branches along the dextran chains with sucrose as the glucosyl donor. The structures and catalytic properties were compared for two GTF-I fragments, GTF-I' (138 kDa) and GS (110 kDa). Both lack the N-terminal 84 residues of GTF-I. While GTF-I' still contains four of the six C-terminal repeats characteristic of streptococcal glucosyltransferases, GS lacks all of them. Electron microscopy of negatively stained samples indicated a double-domain structure for GTF-I', consisting of a spherical head with a smaller spherical tail, which was occasionally seen as a long extension. GS was seen just as the head portion of GTF-I'. In the absence of dextran, both fragments simply hydrolyzed sucrose with similar K(m) and k(cat) values at low concentrations (&lt
    5 mM). At higher sucrose concentrations (&gt
    10 mM), however, GTF-I' exhibited glucosyl transfer activity to form insoluble α-1,3-glucans. So did GS, but less efficiently. Dextran increased the rate and efficiency of the glucosyl transfer by GTF-I'. On removal of the C-terminal repeats of GTF-I' by mild trypsin treatment, this dextran-stimulated transfer was completely lost and the dextran-independent transfer became less efficient. These results indicate that the N-terminal two-thirds of the GTF-I sequence are organized as a structurally and functionally independent domain to catalyze not only sucrose hydrolysis but also glucosyl transfer to form α-1,3-glucan chains, although not efficiently
    the C-terminal repeat increases the efficiency of the intrinsic glucosyl transfer by the N-terminal domain as well as rendering the whole molecule primer-dependent for far more efficient insoluble glucan synthesis.

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  • Release and Recharge of Fluoride by Restorative Materials

    Toshiyuki Itota, Mimiko Okamoto, Kohei Sato, Satoshi Nakabo, Michihiro Nagamine, Yasuhiro Torii, Kiyoshi Inoue

    Dental Materials Journal   18 ( 4 )   347 - 353   1999

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    Language:English   Publisher:Japanese Society for Dental Materials and Devices  

    This study investigated the release and recharge of fluoride by restorative materials. Resin-modified glass ionomers (RGIs), polyacid-modified composite resins (PMCRs) and resin composite containing fluoride were used for comparison of fluoride release. Non-fluoride-releasing resin composite was used as a control. The amounts of fluoride release from RGIs and PMCRs remarkably increased in the citrate-phosphate acid buffer compared with distilled water. The amounts of fluoride recharged in RGIs increased with the concentration of NaF solution, but those of PMCRs exposed to all concentrations of NaF solutions were less than 1.5 ppm. Neither resin composite containing fluoride and non-fluoride-releasing resin composite gave any evidence of recharge. RGIs and PMCRs affected by acid buffer solution could not recharge much fluoride even if they were immersed in the 1000 ppmF NaF solution. The results suggested that the matrix of RGIs and PMCRs functioned as a reservoir of fluoride, but the functions were lost by acid attack.

    DOI: 10.4012/dmj.18.347

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  • 精神科病院入院患者における修復処置の臨床評価

    永峰道博, 太田佳宏, 石崎貴志, 伊澤俊次, 小山 力, 小西法文, 鳥井康弘, 井上 清

    岡山歯学会雑誌   1999

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  • CAD/CAMセラミックインレーの臨床成績(第3報)6年経過観察

    鳥井康弘, 伊東孝介, 糸田俊之, 伊澤俊次, 今濱俊博, 濱 和洋, 小西法文, 永峰道博, 井上 清

    日本歯科保存学雑誌   1999

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  • Influence of Filler Content and Gap Dimension on Wear Resistance of Resin Composite Luting Cements around a CAD/CAM Ceramic Inlay Restoration

    Yasuhiro Torii, Kousuke Itou, Toshiyuki Itota, Kazuhiro Hama, Norifumi Konishi, Michihiro Nagamine, Kiyoshi Inoue

    Dental Materials Journal   18 ( 4 )   453 - 461   1999

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    We investigated the influence of filler content and gap dimension on the wear resistance of composite luting cement around CAD/CAM ceramic inlay restorations. Experimental hybrid dual- cured composite luting cements containing 60, 70, 72, 74 and 80 wt% of silanated barium-silica fillers were used for cementing CAD/CAM ceramic inlay into the cavity. The specimens involving inlay-cement-tooth interfaces were subjected to a three-body wear test. The relation between the interfacial gap dimension and wear loss was also investigated using 60, 70 and 80 wt% filled cements. The cements containing more than 70 wt% filler presented significantly higher wear resistance than 60 wt% filled cement. There was a positive linear relationship between gap dimension and wear loss, and the inclination of the regression line decreased with increasing filler content. These results indicated that the higher filler content of the cement increased the wear resistance and this desirable influence appeared more remarkably in the wider horizontal gap dimension.

    DOI: 10.4012/dmj.18.453

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  • Influence of Filler Content and Gap Dimension on Wear Resistance of Resin Composite Luting Cements around a CAD/CAM Ceramic Inlay Restoration

    Yasuhiro Torii, Kousuke Itou, Toshiyuki Itota, Kazuhiro Hama, Norifumi Konishi, Michihiro Nagamine, Kiyoshi Inoue

    Dental Materials Journal   18 ( 4 )   453 - 461   1999

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    Language:English   Publisher:Japanese Society for Dental Materials and Devices  

    We investigated the influence of filler content and gap dimension on the wear resistance of composite luting cement around CAD/CAM ceramic inlay restorations. Experimental hybrid dual- cured composite luting cements containing 60, 70, 72, 74 and 80 wt% of silanated barium-silica fillers were used for cementing CAD/CAM ceramic inlay into the cavity. The specimens involving inlay-cement-tooth interfaces were subjected to a three-body wear test. The relation between the interfacial gap dimension and wear loss was also investigated using 60, 70 and 80 wt% filled cements. The cements containing more than 70 wt% filler presented significantly higher wear resistance than 60 wt% filled cement. There was a positive linear relationship between gap dimension and wear loss, and the inclination of the regression line decreased with increasing filler content. These results indicated that the higher filler content of the cement increased the wear resistance and this desirable influence appeared more remarkably in the wider horizontal gap dimension.

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  • Influence of Filler Content and Gap Dimension on Wear Resistance of Resin Composite Luting Cements around a CAD/CAM Ceramic Inlay Restoration

    Yasuhiro Torii, Kousuke Itou, Toshiyuki Itota, Kazuhiro Hama, Norifumi Konishi, Michihiro Nagamine, Kiyoshi Inoue

    Dental Materials Journal   18 ( 4 )   453 - 461   1999

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    Language:English   Publisher:Japanese Society for Dental Materials and Devices  

    We investigated the influence of filler content and gap dimension on the wear resistance of composite luting cement around CAD/CAM ceramic inlay restorations. Experimental hybrid dual- cured composite luting cements containing 60, 70, 72, 74 and 80 wt% of silanated barium-silica fillers were used for cementing CAD/CAM ceramic inlay into the cavity. The specimens involving inlay-cement-tooth interfaces were subjected to a three-body wear test. The relation between the interfacial gap dimension and wear loss was also investigated using 60, 70 and 80 wt% filled cements. The cements containing more than 70 wt% filler presented significantly higher wear resistance than 60 wt% filled cement. There was a positive linear relationship between gap dimension and wear loss, and the inclination of the regression line decreased with increasing filler content. These results indicated that the higher filler content of the cement increased the wear resistance and this desirable influence appeared more remarkably in the wider horizontal gap dimension.

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  • Influence of Filler Content and Gap Dimension on Wear Resistance of Resin Composite Luting Cements around a CAD/CAM Ceramic Inlay Restoration

    Yasuhiro Torii, Kousuke Itou, Toshiyuki Itota, Kazuhiro Hama, Norifumi Konishi, Michihiro Nagamine, Kiyoshi Inoue

    Dental Materials Journal   18 ( 4 )   453 - 461   1999

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    Language:English   Publisher:Japanese Society for Dental Materials and Devices  

    We investigated the influence of filler content and gap dimension on the wear resistance of composite luting cement around CAD/CAM ceramic inlay restorations. Experimental hybrid dual- cured composite luting cements containing 60, 70, 72, 74 and 80 wt% of silanated barium-silica fillers were used for cementing CAD/CAM ceramic inlay into the cavity. The specimens involving inlay-cement-tooth interfaces were subjected to a three-body wear test. The relation between the interfacial gap dimension and wear loss was also investigated using 60, 70 and 80 wt% filled cements. The cements containing more than 70 wt% filler presented significantly higher wear resistance than 60 wt% filled cement. There was a positive linear relationship between gap dimension and wear loss, and the inclination of the regression line decreased with increasing filler content. These results indicated that the higher filler content of the cement increased the wear resistance and this desirable influence appeared more remarkably in the wider horizontal gap dimension.

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  • Osteocalcin-immunoreactive primary sensory neurons in the rat spinal and trigeminal nervous systems

    Ichikawa, H, Itota, T, Torii, Y, Inoue, K, Sugimoto, T

    Brain Research   1999

  • 修復材料からのフッ素徐放と臨床的意義

    鳥井康弘, 糸田俊之

    歯界展望   93・4・795〜801   1999

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  • Structure and enzymatic properties of genetically truncated forms of the water-insoluble glucan-synthesizing glucosyltransferase from Streptococcus sobrinus

    Norifumi Konishi, Yasuhiro Torii, Tatsuo Yamamoto, Atsushi Miyagi, Hiroyuki Ohta, Kazuhiro Fukui, Satoshi Hanamoto, Hideki Matsuno, Hideyuki Komatsu, Takao Kodama, Eisaku Katayama

    Journal of Biochemistry   126 ( 2 )   287 - 295   1999

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    Language:English   Publisher:Japanese Biochemical Society  

    Glucosyltransferase-I (GTF-I: 175 kDa) of a cariogenic bacterium, Streptococcus sobrinus 6715, mediates the conversion of water-soluble dextran (α-1,6-glucan) into a water-insoluble form by making numerous α-1,3-glucan branches along the dextran chains with sucrose as the glucosyl donor. The structures and catalytic properties were compared for two GTF-I fragments, GTF-I' (138 kDa) and GS (110 kDa). Both lack the N-terminal 84 residues of GTF-I. While GTF-I' still contains four of the six C-terminal repeats characteristic of streptococcal glucosyltransferases, GS lacks all of them. Electron microscopy of negatively stained samples indicated a double-domain structure for GTF-I', consisting of a spherical head with a smaller spherical tail, which was occasionally seen as a long extension. GS was seen just as the head portion of GTF-I'. In the absence of dextran, both fragments simply hydrolyzed sucrose with similar K(m) and k(cat) values at low concentrations (&lt
    5 mM). At higher sucrose concentrations (&gt
    10 mM), however, GTF-I' exhibited glucosyl transfer activity to form insoluble α-1,3-glucans. So did GS, but less efficiently. Dextran increased the rate and efficiency of the glucosyl transfer by GTF-I'. On removal of the C-terminal repeats of GTF-I' by mild trypsin treatment, this dextran-stimulated transfer was completely lost and the dextran-independent transfer became less efficient. These results indicate that the N-terminal two-thirds of the GTF-I sequence are organized as a structurally and functionally independent domain to catalyze not only sucrose hydrolysis but also glucosyl transfer to form α-1,3-glucan chains, although not efficiently
    the C-terminal repeat increases the efficiency of the intrinsic glucosyl transfer by the N-terminal domain as well as rendering the whole molecule primer-dependent for far more efficient insoluble glucan synthesis.

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  • Inhibition of Carious Lesions in vitro around Gallium Alloy Restorations by Fluoride Releasing Resin-ionomer Cement

    Michihiro Nagamine, Nasman Nur Alim, Toshiyuki Itota, Yasuhiro Torii, Michal Staninec, Kiyoshi Inoue

    Dental Materials Journal   18 ( 1 )   42 - 53   1999

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    A new fluoride releasing resin-ionomer cement was used for bonding of gallium alloy restorations in vitro. Etching, priming, and fluoride releasing resin-ionomer cement were used in the experimental group (ARG), prior to placement of the gallium alloy restorations. Three different controls were used: gallium alloy only (G), no etching, fluoride releasing resin-ionomer cement, gallium alloy (RG), etching, priming, non-fluoride cement and gallium alloy (ACG). The mean shear bond strengths of ARG group to enamel and dentin were higher than those of the three control groups. Artificial secondary caries lesions around the restorations in the experimental group and the control groups were produced, using a strep. mutans culture. The microradiographs were examined for presence of a caries inhibition zone near the restoration. Caries inhibition zones were clearly detected around RG and ARG, but not around G and ACG. The results indicate that the fluoride releasing resin-ionomer cement provided good adhesion and caries inhibition in enamel and dentin.

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  • Inhibition of Carious Lesions in vitro around Gallium Alloy Restorations by Fluoride Releasing Resin-ionomer Cement

    Michihiro Nagamine, Nasman Nur Alim, Toshiyuki Itota, Yasuhiro Torii, Michal Staninec, Kiyoshi Inoue

    Dental Materials Journal   18 ( 1 )   42 - 53   1999

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    Language:English   Publisher:Japanese Society for Dental Materials and Devices  

    A new fluoride releasing resin-ionomer cement was used for bonding of gallium alloy restorations in vitro. Etching, priming, and fluoride releasing resin-ionomer cement were used in the experimental group (ARG), prior to placement of the gallium alloy restorations. Three different controls were used: gallium alloy only (G), no etching, fluoride releasing resin-ionomer cement, gallium alloy (RG), etching, priming, non-fluoride cement and gallium alloy (ACG). The mean shear bond strengths of ARG group to enamel and dentin were higher than those of the three control groups. Artificial secondary caries lesions around the restorations in the experimental group and the control groups were produced, using a strep. mutans culture. The microradiographs were examined for presence of a caries inhibition zone near the restoration. Caries inhibition zones were clearly detected around RG and ARG, but not around G and ACG. The results indicate that the fluoride releasing resin-ionomer cement provided good adhesion and caries inhibition in enamel and dentin.

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  • Release and Recharge of Fluoride by Restorative Materials

    Toshiyuki Itota, Mimiko Okamoto, Kohei Sato, Satoshi Nakabo, Michihiro Nagamine, Yasuhiro Torii, Kiyoshi Inoue

    Dental Materials Journal   18 ( 4 )   347 - 353   1999

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    Language:English   Publisher:Japanese Society for Dental Materials and Devices  

    This study investigated the release and recharge of fluoride by restorative materials. Resin-modified glass ionomers (RGIs), polyacid-modified composite resins (PMCRs) and resin composite containing fluoride were used for comparison of fluoride release. Non-fluoride-releasing resin composite was used as a control. The amounts of fluoride release from RGIs and PMCRs remarkably increased in the citrate-phosphate acid buffer compared with distilled water. The amounts of fluoride recharged in RGIs increased with the concentration of NaF solution, but those of PMCRs exposed to all concentrations of NaF solutions were less than 1.5 ppm. Neither resin composite containing fluoride and non-fluoride-releasing resin composite gave any evidence of recharge. RGIs and PMCRs affected by acid buffer solution could not recharge much fluoride even if they were immersed in the 1000 ppmF NaF solution. The results suggested that the matrix of RGIs and PMCRs functioned as a reservoir of fluoride, but the functions were lost by acid attack.

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  • Release and Recharge of Fluoride by Restorative Materials

    Toshiyuki Itota, Mimiko Okamoto, Kohei Sato, Satoshi Nakabo, Michihiro Nagamine, Yasuhiro Torii, Kiyoshi Inoue

    Dental Materials Journal   18 ( 4 )   347 - 353   1999

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    Language:English   Publisher:Japanese Society for Dental Materials and Devices  

    This study investigated the release and recharge of fluoride by restorative materials. Resin-modified glass ionomers (RGIs), polyacid-modified composite resins (PMCRs) and resin composite containing fluoride were used for comparison of fluoride release. Non-fluoride-releasing resin composite was used as a control. The amounts of fluoride release from RGIs and PMCRs remarkably increased in the citrate-phosphate acid buffer compared with distilled water. The amounts of fluoride recharged in RGIs increased with the concentration of NaF solution, but those of PMCRs exposed to all concentrations of NaF solutions were less than 1.5 ppm. Neither resin composite containing fluoride and non-fluoride-releasing resin composite gave any evidence of recharge. RGIs and PMCRs affected by acid buffer solution could not recharge much fluoride even if they were immersed in the 1000 ppmF NaF solution. The results suggested that the matrix of RGIs and PMCRs functioned as a reservoir of fluoride, but the functions were lost by acid attack.

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  • Cytotoxicity of a Trial Resin Composite Liner Containing TiK2F6 on Rat Dental Pulp Cells

    Toshiyuki Itota, Yasuhiro Torii, Norio Sogawa, Chiharu Sogawa, Kiyoshi Inoue

    Dental Materials Journal   18 ( 3 )   271 - 277   1999

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    The aim of this study was to assess the toxicological responses of a resin composite containing TiK2F6 and NaF in rat dental pulp cells. Trial resin composite liners were made, containing 3 wt% fluorides (TiK2F6 or NaF). These specimens were immersed in 5 ml of cell culture medium supplemented at 37°C for 24 hours. The eluates were used for the experiments. We judged the cytotoxicity of the samples by the cell viability. The original elute solution was serially diluted and then the medium was exchanged for the dilute medium. The cell viability at 1, 2 or 5 days after commencement of re-culturing was calculated. The viability of cells in the eluate from the resin composite liners containing TiK2F6 and NaF decreased with time. The cytotoxicity of TiK2F6 was weaker than that of NaF at all times.

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  • Cytotoxicity of a trial resin composite liner containing TiK2F6 on rat dental pulp cells

    Itota, T, Torii, Y, Sogawa, N, Sogawa, C, Inoue, K

    Dental Materials Journal   1999

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  • Inhibition of Carious Lesions in vitro around Gallium Alloy Restorations by Fluoride Releasing Resin-ionomer Cement

    Michihiro Nagamine, Nasman Nur Alim, Toshiyuki Itota, Yasuhiro Torii, Michal Staninec, Kiyoshi Inoue

    Dental Materials Journal   18 ( 1 )   42 - 53   1999

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    Language:English   Publisher:Japanese Society for Dental Materials and Devices  

    A new fluoride releasing resin-ionomer cement was used for bonding of gallium alloy restorations in vitro. Etching, priming, and fluoride releasing resin-ionomer cement were used in the experimental group (ARG), prior to placement of the gallium alloy restorations. Three different controls were used: gallium alloy only (G), no etching, fluoride releasing resin-ionomer cement, gallium alloy (RG), etching, priming, non-fluoride cement and gallium alloy (ACG). The mean shear bond strengths of ARG group to enamel and dentin were higher than those of the three control groups. Artificial secondary caries lesions around the restorations in the experimental group and the control groups were produced, using a strep. mutans culture. The microradiographs were examined for presence of a caries inhibition zone near the restoration. Caries inhibition zones were clearly detected around RG and ARG, but not around G and ACG. The results indicate that the fluoride releasing resin-ionomer cement provided good adhesion and caries inhibition in enamel and dentin.

    DOI: 10.4012/dmj.18.42

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  • Structure and enzymatic properties of genetically truncated forms of the water-insoluble glucan-synthesizing glucosyltransferase from Streptococcus sobrinus

    Norifumi Konishi, Yasuhiro Torii, Tatsuo Yamamoto, Atsushi Miyagi, Hiroyuki Ohta, Kazuhiro Fukui, Satoshi Hanamoto, Hideki Matsuno, Hideyuki Komatsu, Takao Kodama, Eisaku Katayama

    Journal of Biochemistry   126 ( 2 )   287 - 295   1999

     More details

    Language:English   Publisher:Japanese Biochemical Society  

    Glucosyltransferase-I (GTF-I: 175 kDa) of a cariogenic bacterium, Streptococcus sobrinus 6715, mediates the conversion of water-soluble dextran (α-1,6-glucan) into a water-insoluble form by making numerous α-1,3-glucan branches along the dextran chains with sucrose as the glucosyl donor. The structures and catalytic properties were compared for two GTF-I fragments, GTF-I' (138 kDa) and GS (110 kDa). Both lack the N-terminal 84 residues of GTF-I. While GTF-I' still contains four of the six C-terminal repeats characteristic of streptococcal glucosyltransferases, GS lacks all of them. Electron microscopy of negatively stained samples indicated a double-domain structure for GTF-I', consisting of a spherical head with a smaller spherical tail, which was occasionally seen as a long extension. GS was seen just as the head portion of GTF-I'. In the absence of dextran, both fragments simply hydrolyzed sucrose with similar K(m) and k(cat) values at low concentrations (&lt
    5 mM). At higher sucrose concentrations (&gt
    10 mM), however, GTF-I' exhibited glucosyl transfer activity to form insoluble α-1,3-glucans. So did GS, but less efficiently. Dextran increased the rate and efficiency of the glucosyl transfer by GTF-I'. On removal of the C-terminal repeats of GTF-I' by mild trypsin treatment, this dextran-stimulated transfer was completely lost and the dextran-independent transfer became less efficient. These results indicate that the N-terminal two-thirds of the GTF-I sequence are organized as a structurally and functionally independent domain to catalyze not only sucrose hydrolysis but also glucosyl transfer to form α-1,3-glucan chains, although not efficiently
    the C-terminal repeat increases the efficiency of the intrinsic glucosyl transfer by the N-terminal domain as well as rendering the whole molecule primer-dependent for far more efficient insoluble glucan synthesis.

    DOI: 10.1093/oxfordjournals.jbchem.a022447

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  • Effect of resin-modified glass ionomer cements on secondary caries

    Michihiro Nagamine, Toshiyuki Itota, Yasuhiro Torii, Masao Irie, Michal Staninec, Kiyoshi Inoue

    American Journal of Dentistry   10 ( 4 )   173 - 178   1997

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    Purpose: To evaluate the in vitro secondary caries inhibitory effect of two resin-modified glass ionomer cements (R-GICs). Materials and Methods: Class V cavities were prepared at the cementoenamel junction on facial and lingual surfaces of 32 extracted upper premolars. The facial cavities were restored with a conventional glass ionomer cement (GIC) (Fuji II), while the lingual cavities were restored with either one of the R-GICs (Fuji II LC, Photac Fil, Vitremer), or a resin composite (Z-100). The margins of the restorations were subjected to a 20-day in vitro cariogenic challenge and the degree of demineralization was analyzed by microradiography. The amounts of fluoride released into distilled water from disc specimens of the materials tested were also measured for immersion time up to 161 days. Results: The R-GICs and GIC's released similar cumulative amounts of fluoride over 161 days. Photac-Fil showed significantly higher amounts of fluoride release over the same period. The depth of the outer lesion and the thickness of the acid-resistant layer showed no significant difference among the R-GICs and GIC's. Moreover, the residual fluoride and calcium in the dentin adjacent to the R-GICs and GIC's were correlated with the thickness of acid-resistant layers in the dentin adjacent to the R-GICs and GIC's by electron probe microanalysis. However, the inhibitory effect of the R- GICs was not directly related to the fluoride concentrations eluted from them.

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Presentations

  • 研修歯科医師の共感性に対する多面的評価―自己評価と他者評価の関連性―

    第9回日本総合歯科学会 総会・学術大会  2016 

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  • 外傷を原因とする置換性歯根吸収歯に対応した2症例

    日本歯科保存学会2016年度春季学術大会(第144回)  2016 

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  • サルコイドーシス患者の歯科治療に携わった一症例

    第9回日本総合歯科学会 総会・学術大会  2016 

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  • 主訴の原因歯の特定が困難であった一症例

    第9回日本総合歯科学会 総会・学術大会  2016 

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  • 実習用顎模型を使用した形成練習に関するアンケート調査

    第37回岡山歯学会総会・学術大会  2016 

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  • 岡山大学病院歯科医師臨床研修における在宅歯科医療研修の改善に向けて

    第35回日本歯科医学教育学会総会および学術大会  2016 

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  • 歯学臨床教育において疑似体験動画から効率的に学習し得る項目についての検討

    第35回日本歯科医学教育学会総会および学術大会  2016 

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  • 初期研修における研修歯科医の共感性の変化

    第35回日本歯科医学教育学会総会および学術大会  2016 

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  • 岡山大学病院で臨床研修を行った女性歯科医師へのアンケート調査:理想の歯科医師像について

    第9回日本総合歯科学会 総会・学術大会  2016 

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  • 岡山大学病院歯科医師臨床研修におけるe-learning講義の導入について

    第9回日本総合歯科学会 総会・学術大会  2016 

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  • 岡山大学病院歯科医師臨床研修における歯科保存治療の経験症例の分析

    日本歯科保存学会2016年度秋季学術大会(第145回)  2016 

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  • 知識データベースが歯科医師臨床研修に与える影響‐歯周治療に関する日報の分析‐

    日本歯科保存学会2016年度秋季学術大会(第145回)  2016 

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  • 周術期管理チームの一員としてチーム医療に参加した症例

    第9回日本総合歯科学会 総会・学術大会  2016 

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  • Analysis of Communication Characteristics Between Dentist and a Worried Patient.

    93th International Association for Dental Research General Session & Exhibition  2015 

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  • 充填用グラスアイオノマーセメント:1級窩洞適合性と接着強さ

    第66回 日本歯科理工学会  2015 

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  • 知識データベースを用いた歯科医師臨床研修における教育の試み

    第36回岡山歯学会総会・学術大会  2015 

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  • 臨床研修での自験診療経験は研修歯科医の初診時医療面接コミュニケーション能力にどのように影響するのか

    第34回日本歯科医学教育学会総会および学術大会  2015 

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  • 岡山大学病院で臨床研修を行った女性歯科医師の現況について-第二報 勤務形態と仕事への満足度-

    第34回日本歯科医学教育学会総会および学術大会  2015 

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  • 可撤性義歯の使用に嫌悪感を持つ患者に対して義歯を作製した一症例

    第8 回 日本総合歯科学会総会・学術大会  2015 

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  • 歯科恐怖症患者に脱感作を用いて行った歯科治療

    第8 回 日本総合歯科学会総会・学術大会  2015 

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  • 歯科治療における聴覚障害者との医療コミュニケーションについて

    第8 回 日本総合歯科学会総会・学術大会  2015 

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  • 女性歯科医師の将来展望―結婚・子供・仕事に対する設計と就労継続のための制度や環境への要望―

    第8 回 日本総合歯科学会総会・学術大会  2015 

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  • 歯科用チェアーからの転落インシデントを防止する方策について

    第8 回 日本総合歯科学会総会・学術大会  2015 

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  • 解剖学的理由から義歯使用が困難な下顎両側遊離端義歯の一症例

    第8 回 日本総合歯科学会総会・学術大会  2015 

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  • 岡山大学病院歯科医師臨床研修における多職種連携診療及び在宅歯科医療研修の現状

    第34回日本歯科医学教育学会総会および学術大会  2015 

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  • 一液性処理剤の歯質接着強さ:処理時間の影響

    第142回 日本歯科保存学会  2015 

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  • 岡山大学病院で臨床研修を行った女性歯科医師の現況について-第一報-

    第33回日本歯科医学教育学会総会および学術大会  2014 

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  • 早期見学実習の一環として実施した外来エスコート実習の追跡評価

    第33回日本歯科医学教育学会総会および学術大会  2014 

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  • 歯科医師臨床研修開始時と修了時の初診時医療面接における歯科医-患者間コミュニケーションの変化

    第33回日本歯科医学教育学会総会および学術大会  2014 

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  • レジンセメントの象牙質接着性 Dual-cure vs.Self-cure

    第140回日本歯科保存学会2014年度春季学術大会  2014 

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  • 市販ワンステップボンディング材における活性ラジカル発生挙動と接着性-乾燥時間の違いによる変化-

    第141回日本歯科保存学会2014年度秋季学術大会  2014 

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  • 岡山大学病院で臨床研修を行った女性歯科医師の現況について-第二報-

    第35回岡山歯学会総会・学術大会  2014 

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  • 臨床研修経験による患者―歯科医間のコミュニケーションの変化

    第6回日本ヘルスコミュニケーション学会学術集会  2014 

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  • 岡山大学医学部1年次生に対する歯学部早期体験実習の試み

    第33回日本歯科医学教育学会総会および学術大会  2014 

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  • 胃の全摘を行った患者の治療経過 -有病高齢患者の歯科治療で目指すもの-

    第7回日本総合歯科学会総会・学術大会  2014 

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  • 咬合崩壊をきたした強い運動症状を有するパーキンソン病患者の歯科治療

    第7回日本総合歯科学会総会・学術大会  2014 

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  • 裏層材の象牙質窩洞適合性 テフロンモールドに生じる間隙と接着強さの影響

    第141回日本歯科保存学会2014年度秋季学術大会  2014 

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  • 歯肉の内縁上皮におけるタイトジャンクション構成タンパクの局在

    第141回日本歯科保存学会2014年度秋季学術大会  2014 

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  • 岡山大学病院における研修歯科医を対象とした医療安全研修プログラム開発の試み

    第7回日本総合歯科学会総会・学術大会  2014 

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  • 総合的歯科治療計画の変更で理解した良好な患者‐歯科医師関係構築の重要性

    第7回日本総合歯科学会総会・学術大会  2014 

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  • 義歯安定剤を常用している患者に対して義歯の新製を行った一症例

    第7回日本総合歯科学会総会・学術大会  2014 

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  • かかりつけ歯科医の役割とは:生活の変化により口腔内状況の悪化を来たした1症例

    第4回総合歯科協議会総会・学術大会  2011 

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  • 電子スピン共鳴法(ESR)によるワンステップボンディング材のラジカル発生挙動の測定

    第135回日本歯科保存学会2011年度秋季学術大会  2011 

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  • 岡山大学病院における歯科研修医を対象とした摂食・嚥下リハビリテーション研修プログラム

    第30回日本歯科医学教育学会総会・学術大会および記念大会  2011 

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  • 岡山大学病院における歯科医師臨床研修前後での臨床経験に関するアンケート調査

    第30回日本歯科医学教育学会総会・学術大会および記念大会  2011 

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  • 臨床研修の前後における理想の歯科医師像の変化

    第4回総合歯科協議会総会・学術大会  2011 

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  • 岡山大学病院における歯科研修医を対象とした医療支援歯科研修プログラム

    第4回総合歯科協議会総会・学術大会  2011 

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  • 岡山大学病院歯科医師臨床研修における経験内容について―アンケート調査による分析―

    第31回岡山歯学会総会・学術大会  2011 

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  • 歯科研修医に対する周術期管理チーム医療教育の意義~岡山大学病院医療支援歯科研修プログラム~

    第31回岡山歯学会総会・学術大会  2011 

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  • 市販ワンステップボンディング材のラジカル発生挙動の測定

    第4回総合歯科協議会総会・学術大会  2011 

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  • 根管治療と開窓術により病巣の縮小をはかった歯根嚢胞の1症例

    第4回総合歯科協議会総会・学術大会  2011 

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  • 岡山大学病院における地域歯科保健研修プログラム-研修歯科医からのアンケート分析-

    第28回日本歯科医学教育学会総会および学術大会  2009 

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  • 歯科医師卒後臨床研修における過去3年間の研修内容分析―研修ノートからの分析-

    第30回岡山歯学会総会・学術大会  2009 

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  • 岡山大学病院歯科医師臨床研修における歯科保存領域研修について-平成18年度と19年度における研修の分析-

    日本歯科保存学会2009年度春季学術大会(第130回)  2009 

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  • 歯科治療におけるコンプライアンスからアドヒアランスへの移行-総合的な歯科治療を行った一症例について-

    総合歯科医療に関する学術研究セミナー2009  2009 

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  • 岡山大学病院総合歯科における過去3年間の診療療内容分析

    総合歯科医療に関する学術研究セミナー2009  2009 

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  • 岡山大学病院における歯科研修医を対象としたICLS講習会の開催

    総合歯科医療に関する学術研究セミナー2009  2009 

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  • 歯学臨床教育における教育支援システムの活用―歯科医師臨床研修教育のための電子ポートフォリオ―

    総合歯科医療に関する学術研究セミナー2009  2009 

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  • 模擬患者参加型教育支援ツールの開発

    第28回日本歯科医学教育学会総会および学術大会  2009 

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  • 過去3年間の岡山大学病院総合歯科における研修状況

    第28回日本歯科医学教育学会総会および学術大会  2009 

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  • H18年度におけるWeb電子ポートフォリオシステム(DailyReport)の評価

    岡山歯学会  2008 

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  • 岡山大学病院総合歯科における領域別診療内容分析

    総合歯科医療に関する学術研究セミナー2008  2008 

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  • 岡山大学病院の歯科医師臨床研修における環境評価〜臨床研修必修化以降2年間の分析〜

    総合歯科医療に関する学術研究セミナー2008  2008 

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  • Webを用いた電子ポートフォリオシステムの評価

    日本歯科医学教育学会  2008 

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  • 岡山大学病院における歯科医師卒後臨床研修必修化前後の研修状況の比較 ―研修歯科医アンケートによる分析―

    日本歯科医学教育学会  2008 

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  • 歯科医師卒後研修における電子ポートフォリオシステムの活用 -本院での経験症例数およびアンケートによる内容評価-

    第28回岡山歯学会  2007 

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  • 歯科医師卒後臨床研修における電子ポートフォリオシステムの活用

    第26回日本歯科医学教育学会  2007 

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  • 歯学部学生への総合歯科学教育

    第26回日本歯科医学教育学会  2007 

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  • 歯科医師卒後臨床研修における臨床研修支援システムの構築

    第26回日本歯科医学教育学会  2007 

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  • 歯科医師卒後臨床研修における研修支援システムの構築

    第28回岡山歯学会  2007 

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  • 歯学臨床教育の現状と将来

    岡山歯学会  2006 

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  • 歯科医師卒後臨床研修における電子ポートフォリオシステムの活用

    第27回岡山歯学会総会  2006 

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  • 岡山大学医学部・歯学部附属病院における新歯科医師卒後臨床研修プログラム -研修ノートおよびResidentの記載内容に基づいた研修目標達成度について-

    第27回岡山歯学会総会  2006 

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  • 岡山大学医学部・歯学部附属病院における過去3年間の歯科医師卒後臨床研修の現状と問題点

    第25回日本歯科医学教育学会総会・学術大会  2006 

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  • 歯科医師卒後臨床研修における電子ポートフォリオシステムの構築

    第25回日本歯科医学教育学会総会・学術大会  2006 

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  • 岡山大学病院歯科医師卒後臨床研修における保存領域診療研修の現状 -電子ポートフォリオシステム「Resident」を用いての集計-

    日本歯科保存学会2006年度秋季学術大会(第125回)  2006 

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  • 歯科医師卒後臨床研修必修化に向けて ―過去2年間における総合歯科での研修目標到達度と今後の展望―

    第25回岡山歯学会  2005 

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  • 岡山大学医学部・歯学部附属病院における新歯科医師卒後臨床研修プログラム -旧プログラムからの改善点と改善理由について-

    第26回岡山歯学会  2005 

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  • 岡山大学医学部・歯学部附属病院における歯科医師卒後臨床研修プログラムの現状と課題

    第24回日本歯科医学教育学会学術大会  2005 

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  • 岡山大学医学部・歯学部附属病院における歯科医師卒後臨床研修

    第23回日本歯科医学教育学会学術大会  2004 

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  • HEMA/1,2-propanediol含有溶液による前処理が齲蝕象牙質への接着に及ぼす影響

    第120回日本歯科保存学会  2004 

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  • 審美修復材料の表面改質によるin vitroでの細菌付着

    第121回日本歯科保存学会  2004 

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  • 歯学臨床教育におけるリフレクション

    第23回日本歯科医学教育学会学術大会  2004 

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  • 岡山大学医学部・歯学部附属病院における歯科医師卒後臨床研修プログラム 2.プログラムの策定と研修状況について

    第24回岡山歯学会  2003 

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  • 岡山大学医学部・歯学部附属病院における歯科医師卒後臨床研修プログラム 1.アンケートに基づいた研修目標の到達度の実態調査

    第24回岡山歯学会  2003 

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  • フッ素作用時期のエナメル質耐酸性に及ぼす影響

    第119回日本歯科保存学会  2003 

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  • アルコキシシランの応用による審美修復材料の表面改質

    第119回日本歯科保存学会  2003 

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  • Estimation system of Japanese dental education (CBT, OSCE)

    International Dental Science Symposium in Seoul National University and Okayama University(第1回日韓歯学国際シンポジウム)  2003 

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  • Immunocytochemical localization of dopamine receptors in rat area postrema

    Japanese Association for Dental Research 51th annual meeting  2003 

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  • pH応答型フッ素徐放性レジンの開発

    第42回日本歯科理工学会  2003 

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  • Effect of remineralization accelerating solution to dentin bonding

    FDI Annual World Dental Congress  2003 

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  • OSCEにおけるコミュニケーション能力の評価について

    第22回日本歯科医学教育学会  2003 

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  • Single component self-etching adhesiveの象牙質接着 ―第一報 健全及びう蝕影響象牙質への初期接着性―

    第118回日本歯科保存学会  2003 

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  • ウェットボンディングシステムを応用したレジンセメントの接着性能について

    第41回日本歯科理工学会  2003 

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  • 酸処理象牙質の収縮動態について(第2報)接触および非接触型プローブによる測定

    第41回日本歯科理工学会  2003 

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  • 新しい根管充填材の開発 ―最新の接着システムを応用した根管治療後の象牙質接着性―

    第21回日本接着歯学会  2003 

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  • モディファイド・シールド・レストレーションに関する細菌学的研究 ―光重合型ボンディング材で封じ込められた細菌の生存性―

    第117回日本歯科保存学会  2002 

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  • フルオロアパタイト析出能を有する接着修復法の開発―試作再石灰化溶液(RE-02)の象牙質接着に及ぼす影響―

    第117回日本歯科保存学会  2002 

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  • 接着システムがフッ素徐放性修復材料の二次齲蝕抑制効果に及ぼす影響

    第117回日本歯科保存学会  2002 

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  • コンポジットレジンへの細菌付着メカニズムの解明―共焦点レーザー顕微鏡による分析―

    第23回岡山歯学会  2002 

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  • Controlled release of fluoride ion from the resin containing NaF coated with tertiary amine-TEGDMA copolymer

    Fourth International Congress on Dental Materials  2002 

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  • Effect of Ultrasonic Caries Excavation on Dentin Bonding Promoted by Two Self-Etching Primer Systems

    Fourth International Congress on Dental Materials  2002 

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  • Effect of HEMA pretreatment on the bonding of the self-etching adhesive system to artificial demineralized dentin

    Fourth International Congress on Dental Materials  2002 

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  • Influence of dentin conditioning using amino acid monomer on morphological structure of collagen and adhesion

    The first International Congress on Adhesive Dentistry  2002 

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  • レジンセメントの象牙質接着強さの時間的推移について

    第39回日本歯科理工学会  2002 

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  • Effects of testing speed and gripping on bond strength

    The 80th General Session and Exhibition of the International Association for Dental Research  2002 

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  • フッ素徐放性修復材料のエナメル質耐酸性向上効果に及ぼすagingの影響

    第38回日本歯科理工学会学術講演会  2002 

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  • リン酸処理時間が象牙質の脱灰コラーゲン層収縮および膨潤に及ぼす影響

    第40回日本歯科理工学会  2002 

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  • フッ素徐放性を付与した試作ワン・ステップ・レジンシステムの象牙質接着性の検討

    第116回日本歯科保存学会  2002 

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  • Micro-tensile bond strength of self-etching adhesive systems to coronal caries-dentin

    The first International Congress on Adhesive Dentistry  2002 

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  • 高分子被覆フッ化物配合によるレジンからの徐放制御

    第22回岡山歯学会  2001 

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  • 齲蝕病巣下のDentin/Pulp Complexにおける病理組織学的検討

    第115回日本歯科保存学会  2001 

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  • All-in-one adhesive systemの象牙質接着における各種conditioning法の効果

    第115回日本歯科保存学会  2001 

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  • GIOMER(リアクトマー)の象牙質接着性と短期経過

    第114回日本歯科保存学会  2001 

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  • 各種接着システムの象牙質接着性に及ぼすEDTA処理の影響

    第114回日本歯科保存学会  2001 

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  • う蝕象牙質へのレジン浸透性-in vitroモデル解析-

    第37回日本歯科理工学会  2001 

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  • 新規ウェットボンディングシステムの歯質接着性

    第19回日本接着歯学会  2001 

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  • Effect of fluoride-releasing liner on decalcified dentin

    The 79th General Session and Exhibition of the International Association for Dental Research  2001 

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  • Effect of EDTA conditioning on dentin adhesion by self-etching primer

    The 79th General Session and Exhibition of the International Association for Dental Research  2001 

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  • Confocal laser-scanning microscope analysis of Actinomyces viscosus adherence to composites

    The 79th General Session and Exhibition of the International Association for Dental Research  2001 

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  • Adehesion of oral streptococci to esthetic restorative materials in vitro

    The 79th General Session and Exhibition of the International Association for Dental Research  2001 

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  • Distribution of calbindin D-28k and osteonectin in human carious teeth

    The International Conference on Dentin/Pulp Complex 2001  2001 

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  • 根面う蝕修復の新しい流れ-フロアブルレジンの接着性-

    第19回日本接着歯学会  2001 

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  • N-acryloyl amino acids with mno- and di-carboxyl groups as conditioner/primer

    The 78th General Session of the International Association for Dental Research  2000 

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  • Effect of self-etching primer containing N-acryloyl aspartic acid on dentin adhesion

    6th World Biomaterials Congress  2000 

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  • 臨床経過からみた審美インレー修復の現状と将来

    第112回日本歯科保存学会シンポジウム2. 21世紀の臼歯修復  2000 

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  • フッ素徐放性歯面処理剤による人工二次齲蝕の抑制

    第112回日本歯科保存学会  2000 

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  • エナメル質およびレジン表面に形成されたプラーク中のmutans streptococci比率の経時的変化

    第112回日本歯科保存学会  2000 

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  • 抗菌性およびフッ素徐放能を有する試作ボンディングシステムの歯質接着性について

    第113回日本歯科保存学会  2000 

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  • MDPB配合試作接着システムの齲蝕象牙質中の嫌気性菌に対する効果

    第113回日本歯科保存学会  2000 

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  • 象牙質接着界面に生成する樹脂含浸層におけるN,O-diacryloxy tyrosineとN-acryloxy phenylalanineの効果

    第36回日本歯科理工学会学術講演会  2000 

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  • シラン処理フッ化物を配合した長期フッ素徐放性レジンがエナメル質の脱灰抵抗性に及ぼす影響

    第36回日本歯科理工学会学術講演会  2000 

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  • A comparison of bacterial communities in carious dentine and plaque

    The 48th Annual meeting of the Japanese Association for Dental Research  2000 

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  • フッ素徐放歯面処理材による脱灰象牙質の再石灰化

    第113回日本歯科保存学会  2000 

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  • Effect of compomer restoration with various adhesives on secondary caries

    The 78th General Session of the International Association for Dental Research  2000 

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  • One-step bonding systemの歯質接着性

    第112回日本歯科保存学会  2000 

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  • セルフエッチングプライマーによる歯質の脱灰挙動について

    第112回日本歯科保存学会  2000 

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  • フッ素徐放性レジンセメントに関する研究(第1報)フッ素徐放性によるエナメル質耐酸性の向上

    第110回日本歯科保存学会  1999 

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  • Simplified-step Bonding System の歯質接着性に及ぼすコンディショニング時間の影響

    第111回日本歯科保存学会  1999 

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  • フッ化物配合レジンからのフッ素徐放制御に関する研究−フッ化物のシラン処理とシラン処理濃度のフッ素徐放性への影響−

    第34回日本歯科理工学会  1999 

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  • アミノ酸誘導体から成るプライマーの象牙質被着面処理効果

    第34回日本歯科理工学会  1999 

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  • フッ素徐放性レジンセメントに関する研究 第3報 フッ化物含有量が物性へ及ぼす影響

    第111回日本歯科保存学会  1999 

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  • フッ素徐放性レジンセメントに関する研究 第2報 フッ化物含有量が耐摩耗性に及ぼす影響

    第111回日本歯科保存学会  1999 

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  • 分子系統学的手法による齲蝕細菌叢の分析

    第111回日本歯科保存学会  1999 

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  • 歯質とレジンとの接着N-acryloyl Aspartic Acid 含有プライマーの組成の検討

    第17回日本接着歯学会  1999 

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  • CAD/CAMセラミックインレーの臨床成績 −6年経過観察−

    第110回日本歯科保存学会  1999 

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  • フッ化物配合レジンからのフッ素徐放制御に関する研究 −フッ化物のシラン処理によるフッ素徐放性への影響−

    第110回日本歯科保存学会  1999 

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  • In situ adherence of streptococci to conventional and resin-modified glassionomers.

    The 77th General Session and Exhibition of the International Association for Dental Research  1999 

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  • Effect of primer containing calcium phosphate on hybrid layer formation

    The 77th General Session and Exhibition of the International Association for Dental Research  1999 

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  • Immunolocalization of calbindin D-28k in odontoblasts of human carious teeth.

    The 47th Annual meeting of the Japanese Association for Dental Research  1999 

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  • 象牙質知覚過敏処理剤で処理した象牙質に対する細菌の初期付着性について

    第110回日本歯科保存学会  1999 

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  • 光硬化型フッ素徐放性修復材料による人工二次齲蝕の抑制

    第110回日本歯科保存学会  1999 

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Research Projects

  • 要介護高齢者歯科医療での実践知の修得を促進させるシミュレーション教育モデルの開発

    Grant number:18K09879  2018.04 - 2021.03

    日本学術振興会  科学研究費助成事業 基盤研究(C)  基盤研究(C)

    鳥井 康弘, 白井 肇, 吉田 登志子, 武田 宏明, 河野 隆幸

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    Grant amount:\4550000 ( Direct expense: \3500000 、 Indirect expense:\1050000 )

    本年度は,昨年度の研究で得られた結果から何よりもまず基本的な治療技能の修得が必須で,シミュレーターを使用した頻回の基本的歯科治療トレーニングと要介護高齢者歯科治療のトレーニングを同時並行で行うことが必要であると考えられたため,研修歯科医43人を対象に,まず基本的な歯科治療を想定したシミュレーショントレーニング,すなわち窩洞・歯冠形成,歯内療法,相互実習での歯周基本治療,印象採得トレーニングを企画・実施し,アンケート分析を行った.次いで,高齢者歯科医療で重要となる摂食嚥下トレーニング,ポータブルユニットの使用方法,車椅子からあるいはそこへの移乗介助および体位変換のトレーニングおよび口腔ケアトレーニング,さらに外部の協力施設に依頼して研修歯科医に実際に在宅訪問診療を経験してもらい,それぞれの項目でアンケートをとって要介護高齢者歯科治療のシミュレーショントレーニングの効果を分析・検討した.
    その結果,まず基礎的トレーニングでは,臨床で役立ったという点について半数以上が窩洞・歯冠形成と歯内療法で非常に役立った,おおむね役立ったと評価し,相互実習ではおおむね役立ったと比較的高い評価が得られ,学生臨床実習での経験不足を反映していると思われた.高齢者シミュレーターを使用しての車椅子への移乗介助および体位変換トレーニングでは75%以上が主体的に参加し研修で経験しておくべきとし,摂食嚥下トレーニングでは見学・アシスタントが主体で相互実習は25%程度でしか経験できなかったものの,90%以上の者が臨床で役立つと回答するなど研修内容に関する評価は高く,積極的な姿勢でトレーニングを受けていることが伺えた.最後に訪問診療の実地研修においては,ほぼ全員がこの経験は将来の自分自身の歯科医療に役立つと評価し,また事前のシミュレーショントレーニングの必要性を認識しているという結果であった.

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  • 臨床経験による研修歯科医の医療面接能力の変化

    Grant number:17K12047  2017.04 - 2021.03

    日本学術振興会  科学研究費助成事業 基盤研究(C)  基盤研究(C)

    吉田 登志子, 白井 肇, 鳥井 康弘, 鈴木 康司, 河野 隆幸

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    Grant amount:\4550000 ( Direct expense: \3500000 、 Indirect expense:\1050000 )

    質の高い患者中心の医療を実現するための第一歩として、患者との良好な関係を築きながら、疾患に関する情報や患者の考えを把握することが重要になる。そのためには患者への共感性や初診時医療面接が果たす役割は大きい。そこで臨床研修期間中に臨床経験を積むことによって、研修歯科医の共感性は高まるのか、また初診時医療面接における情報収集力やコミュニケーション力は向上するのかを検証するために本研究を実施した。
    当該年度は平成29年度および30年度のデータの分析を取りまとめた。計64名の研修歯科医を対象として、研修開始時と修了時において共感性を測定する全20項目から成る質問紙であるJefferson Scale of Empathy(JSE)に研修歯科医が回答し、模擬患者との初診時医療面接を行った。模擬患者は5項目、そして指導歯科医は12項目から成る評価票を用いて医療面接時の研修歯科医を評価した。また、医療面接中の会話の内容はThe Rotor Method of Interaction Process Analysis System (RIAS)とVerona Coding Definitions of Emotional Sequences (VR-CoDES)を用いて分析した。
    その結果、JSE、模擬患者評価および指導歯科医評価の合計点には研修開始時と修了時の間には有意差を認めなかった。RIASによる医療面接の会話内容の分析においては、研修修了時は開始時と比較して、研修歯科医の情緒的表現および医学的状態、心理社会的な情報収集に関する発話が有意に減少した。しかしながら、歯科医学的状態の情報収集に関する発話は有意に増加した。患者からの不安や心配を引き出す能力やその対応を分類するためのVR-CoDESによる分析は現在進行中である。

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  • Development of the odontology clinical learning support system to learn from a vicarious experience video image

    Grant number:16K11886  2016.04 - 2019.03

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (C)  Grant-in-Aid for Scientific Research (C)

    SHIRAI Hajime

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    Grant amount:\4680000 ( Direct expense: \3600000 、 Indirect expense:\1080000 )

    A training dentist always experiences an inexperienced matter and is learning newly by dental clinical education. I can think the incident a beginner experiences by basic dental technology is universal in the learning process, but every time a learner will change for an educator, great educational effort has to tell repeatedly, and is needed. A training dentist is clinical by this research, and own learning system that I'll can utilize others' experience as the experience has been developed by vicarious experience animation-izing the incident I face. Reduction in educational effort is planned for for an educator as well as a main system can expect that I contribute to safety's and relief's being able to execute odontology clinical education.

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  • Development of a dental communication guide tying basic theory and clinical practice

    Grant number:26463183  2014.04 - 2018.03

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (C)  Grant-in-Aid for Scientific Research (C)

    Yoshida Toshiko, SUZUKI Kazuyosi, ITO Takanori, HUJISAKI Kazuhiko, NADAMITSU Yoko, MATAKI Shiro, OGAWA Tetsuji, TORII Yasuhiro

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    Grant amount:\4940000 ( Direct expense: \3800000 、 Indirect expense:\1140000 )

    The purpose of this study is to create a guide for teaching health communication. We aggregated opinions by means of questionnaire and discussion from health communication interdisciplinary professionals as well as teachers in charge of dental health communication regarding contents and instructional methodologies in teaching dental health communication. The following nine major item contents in teaching were identified and included in the guide: 1) basic communication, 2) background theory of communication, 3) structure of communication, 4) interpersonal function in communication, 5) patient-center healthcare, 6) intercultural aspect in communication, 7) medical interviewing, 8) informed consent, 9) behavioral modification. Practical training, patient escort practicum, role playing with peers and simulated patients, learning system using video and portfolio were identified as instructional methodologies.

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  • Development of clinical learning support system for dentistry - Development of evaluation system in skill area -

    Grant number:26463185  2014.04 - 2017.03

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (C)  Grant-in-Aid for Scientific Research (C)

    Suzuki Koji

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    Grant amount:\4940000 ( Direct expense: \3800000 、 Indirect expense:\1140000 )

    We have built an electronic portfolio system as an active learning support system in the knowledge / attitude domain. In this research we aimed to construct a learning support system of the skill area. We created a demonstration video and released it on the electronic portfolio. We have developed a training environment using a simulator as a learning support system. We conducted a questionnaire survey for the trainee dentist and improved the environment. In addition, 13 items of evaluation in the skill area were formulated.

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  • Development of the IT learning support system using knowledge management in clinical dentistry

    Grant number:26463184  2014.04 - 2017.03

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (C)  Grant-in-Aid for Scientific Research (C)

    TORII Yasuhiro

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    Grant amount:\4940000 ( Direct expense: \3800000 、 Indirect expense:\1140000 )

    The text data of clinical records accumulated in the electronic portfolio system which we introduced into dental practice training education in Okayama University Hospital were collected and classified in every treatment. The clinical problems that dental practice beginners faced were analyzed using the text mining method. As a result, a lot of keywords related to dental procedures were listed in the item of "the impression" about contents of the treatment. On the other hand, there were many keywords related to the learning such as "study", "exercise" and "review" in the item of "the future task". Then, after sorting to reduce the quantity of the text data, they were refined and accumulated as knowledge data. An IT learning support system in clinical dentistry was produced experimentally using this knowledge database. When this system was evaluated, a relatively good evaluation was provided from trainee dentists.

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  • The establishment of knowledge databases system for postgraduate clinical training course

    Grant number:25463244  2013.04 - 2016.03

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (C)  Grant-in-Aid for Scientific Research (C)

    KONO TAKAYUKI, TORII Yasuhiro, SHIRAI Hajime, SUZUKI Koji, KUWAYAMA Kaori

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    Grant amount:\5070000 ( Direct expense: \3900000 、 Indirect expense:\1170000 )

    The aim of this study is to evaluate the efficacy of new knowledge databases system. We established knowledge databases system associated with periodontology in the 2013 academic year and educate dental residents on Postgraduate Clinical Training Course in Okayama University Hospital in the 2014 academic year. The evaluation of this system were conducted by compared the contents of portfolios between in the 2013 and 2014 academic year and by the questionnaire surveys at June and February in the 2015 academic year.
    As a result, using this system does not affect the contents of portfolios. On the other hand, the questionnaire surveys demonstrate that this system is used very often at the beginning of Postgraduate Clinical Training Course, and almost dental residents agree with positive educational effect of this system.
    We conclude that the knowledge databases system is very useful at the beginning of Postgraduate Clinical Training Course.

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  • Comprehensive Dentistry 1 (2020academic year) 1st semester  - 木3

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  • 令和3年度鹿児島大学病院歯科医師臨床研修指導歯科医講習会

    Role(s):Commentator, Lecturer

    鹿児島大学病院  2021.7.17 - 2021.7.18