Language：English   Publishing type：Research paper (scientific journal)  

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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Language：English   Publishing type：Research paper (scientific journal)  

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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Language：English   Publishing type：Research paper (scientific journal)  

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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Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：岡山歯学会  

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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Language：English   Publishing type：Research paper (scientific journal)  

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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Language：English   Publishing type：Research paper (scientific journal)   Publisher：JAPANESE SOC DENTAL MATERIALS DEVICES  

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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Language：Japanese   Publishing type：Research paper (scientific journal)  

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：Public Library of Science ({PLoS})  

DOI： 10.1371/journal.pone.0176453

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：The Company of Biologists  

DOI： 10.1242/jcs.196907

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：ELSEVIER SCIENCE BV  

Introduction: Salivary gland hypofunction, also known as xerostomia, occurs as a result of radiotherapy for head and neck cancer, autoimmune diseases, or aging. Xerostomia leads to oral health problems and thus affects the quality of life. Biological salivary gland tissue generated in vitro would provide an alternative mode of treatment for this disease.
Methods: To develop a novel method for modulating salivary gland tissue growth in vitro, we prepared a KP24 peptide-immobilized hydrogel sheet, wherein the peptide comprised repeating proline and lysine sequences, and evaluated the effect of this peptide on salivary gland tissue growth.
Results: We found that the KP24 peptide has the potential to enhance glandular tissue growth in vitro. This enhancement is associated with neurite outgrowth and increasing neural innervation.
Conclusion: KP24 peptide modified material would be a promising material for the modulation of salivary gland tissue growth in vitro. (C) 2016, The Japanese Society for Regenerative Medicine. Production and hosting by Elsevier B.V.

DOI： 10.1016/j.reth.2016.02.006

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Language：Japanese   Publisher：Japanese Dental Education Association  

<p> Abstract Okayama University Dental School implemented an outpatient escort practicum as a form of early clinical exposure. It is useful to clarify how students perceived the practicum after they finished their clinical training to inform improvements. The purpose of this study was to evaluate an outpatient escort practicum implemented with first-grade students from the perspective of those students after they had completed clinical training.</p><p> The evaluation was performed twice, with the same students completing the questionnaires. The first evaluation was conducted immediately after the outpatient escort practicum in the students' first grade, and the second after they had completed their clinical training (sixth grade). The participants were 82 dental students who completed both questionnaires about the outpatient escort practicum.</p><p> Overall, the second evaluation was significantly lower than the first evaluation. Students who positively evaluated the practicum in their first grade but gave a negative evaluation in their sixth grade reported less appreciation for the practicum in terms of understanding the patients' perspectives and understanding the communication skills required by future healthcare professionals. Students who positively evaluated the practicum both times highlighted that the practicum helped them to understand the communication skills required by future dentists. The study findings indicated that the practicum was more positively evaluated by students immediately after they had completed it than by the same students 5 years later. However, the practicum was positively evaluated by the participating students after they had completed clinical training to some extent.</p>

DOI： 10.24744/jdea.32.2_84

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Language：Japanese   Publisher：岡山歯学会  

平成18年〜25年度に当院で歯科医師臨床研修を受けた女性188名に対して平成26年1月〜3月にWebアンケートを行い、「結婚の有無」「子供の有無」「就労の有無」「勤務形態(常勤・非常勤)」「非常勤の理由」「休職経験の有無」「休職の理由」などについて調査した。114名から有効回答が得られた。回答を分析した結果、「結婚の有無」と「子供の有無」は「就労の有無」に有意な影響を与えていたが、「勤務形態」には有意な影響を与えていなかった。休職の理由は「出産・育児」が最も多かった。これらの結果から、女性歯科医師の就労継続には特に「子供の有無」が大きな影響を与えていると考えられた。

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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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Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.1089/3dp.2014.0023

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Publishing type：Research paper (international conference proceedings)   Publisher：IEEE  

DOI： 10.1109/MHS.2015.7438259

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Language：English   Publisher：The Biophysical Society of Japan General Incorporated Association  

DOI： 10.2142/biophys.54.S170_2

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Language：Japanese   Publisher：岡山歯学会  

過去5年間に岡山大学歯科医師卒後臨床研修プログラムを選択した研修歯科医師280名を対象に、研修開始時と終了時に30項目の臨床経験の有無についてアンケート調査を行った。その結果、概ね経験できている項目は研修開始時6項目、終了時16項目であった。経験者率は終了時の方がほぼ全項目で高く、23項目は有意に高かった。単独型プログラムと複合型プログラムの終了時の経験者率の比較では、単独型プログラムの方が高かったのは1項目、複合型の方が高かったのは4項目であった。岡山大学出身者と他大学出身者との比較では、研修開始時、終了時共に岡山大学出身者の方が経験者率が高かった。以上より、研修開始時は研修歯科医の臨床経験の差が大きく、臨床研修終了時には全ての検討項目で経験率が上昇した。卒前教育での経験の差は卒後臨床経験に影響することが示唆され、卒前教育と卒後臨床経験の連携の重要性が再認識された。

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Language：Japanese   Publisher：岡山歯学会  

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：MOSBY-ELSEVIER  

Introduction: Our aims in this study were to determine the anteroposterior facial relationship that is regarded as most attractive by Japanese laypersons in a questionnaire survey and to evaluate which analysis of the soft-tissue profile is most suitable for Japanese people. Methods: We showed 262 Japanese laypersons (121 male, 141 female) 9 morphed profile images with Point B and menton anteriorly or distally moved by software and asked them to number them sequentially according to their attractiveness. To examine which analysis best reflects facial attractiveness as judged by laypersons, we made 5 types of analyses of the facial profile with 11 variables in the 9 images. Results: The normal face was judged favorably; however, an attractive profile might be different for each subject. The 3 highest ranking profiles (normal face and moderate mandibular retrusions) were often favorites, and 2 profiles (severe mandibular protrusions) were liked the least for most subjects. However, the other images showed a wide range of distribution. Mandibular retrusion was generally more favored than mandibular protrusion and bimaxillary protrusion (severe chin retrusion) had a high attractiveness ranking and was well accepted in the Japanese population. Conclusions: To evaluate the profiles of Japanese subjects, it is important to evaluate not only the esthetic line defined by the nose and chin, but also the balance of the upper and lower lips defined by the posterior reference line-ie, Burstone&apos;s Sn-Pog&apos; line. (Am J Orthod Dentofacial Orthop 2009; 135: 73-8)

DOI： 10.1016/j.ajodo.2006.12.021

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Language：Japanese   Publisher：(一社)日本歯科理工学会  

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Language：Japanese   Publisher：(NPO)日本歯科保存学会  

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Language：Japanese   Publisher：(NPO)日本歯科保存学会  

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Event date： 2022.11.10 - 2022.11.11

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Event date： 2022.11.10 - 2022.11.11

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Event date： 2022.11.5 - 2022.11.6

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Event date： 2022.6.16 - 2022.6.29

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Event date： 2021.10.29 - 2021.11.6

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Event date： 2021.10.28 - 2021.11.10

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Event date： 2021.10.28 - 2021.11.10

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Event date： 2021.10.16 - 2021.10.17

Language：Japanese   Presentation type：Poster presentation  

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Event date： 2021.6.10 - 2021.6.30

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Event date： 2021.6.10 - 2021.6.30

Language：Japanese   Presentation type：Poster presentation  

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Event date： 2021.4.10 - 2021.4.11

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Event date： 2020.11.16 - 2020.11.30

Language：Japanese   Presentation type：Poster presentation  

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Event date： 2020.11.16 - 2020.11.30

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Event date： 2020.11.16 - 2020.11.30

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Event date： 2020.11.7 - 2020.11.8

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Event date： 2020.10.31 - 2020.11.3

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Event date： 2020.10.31 - 2020.11.3

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Event date： 2020.6.11 - 2020.6.12

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Event date： 2020.4.18 - 2020.4.19

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Event date： 2019.11.7 - 2019.11.8

Language：Japanese   Presentation type：Poster presentation  

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Event date： 2019.11.2 - 2019.11.3

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Event date： 2019.11.2 - 2019.11.3

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Event date： 2019.11.2 - 2019.11.3

Language：Japanese   Presentation type：Poster presentation  

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Event date： 2019.8.24 - 2019.8.28

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Event date： 2019.7.19 - 2019.7.20

Language：Japanese   Presentation type：Poster presentation  

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Event date： 2019.6.27 - 2019.6.28

Language：Japanese   Presentation type：Poster presentation  

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Event date： 2019.4.20 - 2019.4.21

Presentation type：Oral presentation (general)  

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Event date： 2019.2.16 - 2019.2.17

Language：Japanese   Presentation type：Poster presentation  

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Event date： 2018.11.1 - 2018.11.2

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Event date： 2018.10.27 - 2018.10.28

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Event date： 2018.10.27 - 2018.10.28

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Event date： 2018.10.27 - 2018.10.28

Language：Japanese   Presentation type：Oral presentation (general)  

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Event date： 2018.10.21

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：岡山  

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Event date： 2018.10.6 - 2018.10.7

Presentation type：Poster presentation  

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Event date： 2018.9.1 - 2018.9.4

Language：English   Presentation type：Poster presentation  

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Event date： 2018.7.27 - 2018.7.28

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Event date： 2018.7.27 - 2018.7.28

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Event date： 2018.7.27 - 2018.7.28

Language：Japanese   Presentation type：Poster presentation  

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Event date： 2018.6.14 - 2018.6.15

Language：Japanese   Presentation type：Poster presentation  

Venue：横浜  

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Event date： 2017.11.30 - 2017.12.1

Language：English   Presentation type：Poster presentation  

Venue：岡山  

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Event date： 2017.11.4 - 2017.11.5

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：新潟  

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Event date： 2017.11.4 - 2017.11.5

Language：Japanese   Presentation type：Poster presentation  

Venue：新潟  

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Event date： 2017.10.26 - 2017.10.27

Language：Japanese   Presentation type：Poster presentation  

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Event date： 2017.10.26 - 2017.10.27

Language：Japanese   Presentation type：Poster presentation  

Venue：大阪  

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Event date： 2017.10.14 - 2017.10.15

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：新潟  

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Event date： 2017.10.1

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：岡山  

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Event date： 2017.8.18 - 2017.8.19

Language：Japanese   Presentation type：Poster presentation  

Venue：札幌  

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Event date： 2017.7.28 - 2017.7.29

Language：Japanese   Presentation type：Poster presentation  

Venue：松本  

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Event date： 2017.7.28 - 2017.7.29

Language：Japanese   Presentation type：Poster presentation  

Venue：松本  

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Event date： 2017.6.8 - 2017.6.9

Language：Japanese   Presentation type：Poster presentation  

Venue：東京  

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Event date： 2017.6.8 - 2017.6.9

Language：Japanese   Presentation type：Poster presentation  

Venue：青森  

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Event date： 2016.11.21 - 2016.11.22

Language：English   Presentation type：Oral presentation (general)  

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Event date： 2016.11.19 - 2016.11.20

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：岡山  

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Event date： 2016.11.19 - 2016.11.20

Language：Japanese   Presentation type：Poster presentation  

Venue：岡山  

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Event date： 2016.11.4 - 2016.11.6

Language：English   Presentation type：Poster presentation  

Venue：Bali, Indonesia  

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Event date： 2016.11.4 - 2016.11.6

Language：English   Presentation type：Poster presentation  

Venue：Bali, Indonesia  

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Event date： 2016.10.27 - 2016.10.28

Language：Japanese   Presentation type：Poster presentation  

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Event date： 2016.10.27 - 2016.10.28

Language：Japanese   Presentation type：Poster presentation  

Venue：松本  

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Event date： 2016.10.27 - 2016.10.28

Language：Japanese   Presentation type：Poster presentation  

Venue：松本  

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Event date： 2016.10.16

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：岡山  

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Event date： 2016.7.1 - 2016.7.2

Language：Japanese   Presentation type：Poster presentation  

Venue：大阪  

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Event date： 2016.7.1 - 2016.7.2

Language：Japanese   Presentation type：Poster presentation  

Venue：大阪  

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Event date： 2016.2.16

Presentation type：Oral presentation (general)  

Venue：徳島  

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Event date： 2015.11.20 - 2015.11.22

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：東京  

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Event date： 2015.11.20 - 2015.11.22

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：東京  

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Event date： 2015.9.27

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：岡山  

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Event date： 2015.7.10 - 2015.7.11

Language：Japanese   Presentation type：Poster presentation  

Venue：鹿児島  

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Event date： 2015.7.10 - 2015.7.11

Language：Japanese   Presentation type：Poster presentation  

Venue：鹿児島  

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Event date： 2015.7.10 - 2015.7.11

Language：Japanese   Presentation type：Poster presentation  

Venue：鹿児島  

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Event date： 2014.11.28 - 2014.11.30

Language：Japanese   Presentation type：Poster presentation  

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Event date： 2014.11.28 - 2014.11.30

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Event date： 2014.11.28 - 2014.11.30

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Event date： 2014.10.30 - 2014.10.31

Language：Japanese   Presentation type：Poster presentation  

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Event date： 2014.10.30 - 2014.10.31

Language：Japanese   Presentation type：Poster presentation  

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Event date： 2014.10.26

Language：Japanese   Presentation type：Oral presentation (general)  

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Event date： 2013.10.19 - 2013.10.20

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Event date： 2012.4.14 - 2012.4.15

Presentation type：Poster presentation  

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Event date： 2010.9.26

Presentation type：Oral presentation (general)  

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