Details of the Researcher

PHOTO

Akio Harada
Section
Graduate School of Dentistry
Job title
Assistant Professor
Degree

  • 博士（歯学）（東北大学）

Research History 3

  • 2017/04 - Present
    Tohoku University Graduate School of Dentistry　Division of Molecular and Regenerative Prosthodontics　Assistant Professor

  • 2015/04 - 2017/03
    Tohoku University Hospital　Department of Fixed Prosthodontics　Clinical Fellow

  • 2010/04 - 2011/03
    Tohoku University Hospital　Graduate Medical Education Center　Dental Resident

Education 3

  • Tohoku University graduate school of Dentistry　Division of Molecular and Regenerative Prosthodontics

    2014/04 - 2015/03

  • Tohoku University graduate school of Dentistry　Division of Fixed Prosthodontics

    2011/04 - 2014/03

  • Tohoku University　Department of Dentistry

    2004/04 - 2010/03

Professional Memberships 3

  • THE JAPANESE SOCIETY FOR DENTAL MATERIALS AND DEVICES

  • 東北大学歯学会

  • 日本補綴歯科学会

Research Interests 6

  • dental metal allergy

  • 接着

  • 低温劣化

  • ジルコニア

  • コンポジットレジン

  • CAD/CAM

Research Areas 1

  • Life sciences / Prosthodontics /

Awards 2

  1. Arthur Frechette Award Finalist

    2015/03　International Association for Dental Research

  2. Dentsply award

    2014/05　Japan Prosthodontic Society

Papers 17

  1. Mechanism underlying ultraviolet-irradiation-induced discoloration of dental zirconia ceramics stabilized with 3 and 5 mol% yttria Peer-reviewed

    Akari Kurihara, Keisuke Nakamura, Shunichi Shishido, Ryoichi Inagaki, Akio Harada, Taro Kanno, Hiroshi Egusa

    Ceramics International　50　(7)　12136-12145　2024/04

    Publisher: Elsevier BV

    DOI： 10.1016/j.ceramint.2024.01.117 　

    ISSN： 0272-8842

  2. 歯科金属アレルギー患者への対応 検査、診断、治療方針と他科連携

    秋葉 陽介, 細木 真紀, 原田 章生, 高岡 由梨那, 渡邉 恵

    日本補綴歯科学会誌　14　(3)　250-258　2022/07

    Publisher: (公社)日本補綴歯科学会

    ISSN： 1883-4426

    eISSN： 1883-6860

  3. 歯科金属アレルギー患者への対応 検査、診断、治療方針と他科連携

    秋葉 陽介, 細木 真紀, 原田 章生, 高岡 由梨那, 渡邉 恵

    日本補綴歯科学会誌　14　(3)　250-258　2022/07

    Publisher: (公社)日本補綴歯科学会

    ISSN： 1883-4426

    eISSN： 1883-6860

  4. Potential complications of CAD/CAM-produced resin composite crowns on molars: A retrospective cohort study over four years. International-journal Peer-reviewed

    Miyu Inomata, Akio Harada, Shin Kasahara, Taro Kusama, Akane Ozaki, Yusuke Katsuda, Hiroshi Egusa

    PloS one　17　(4)　e0266358　2022

    DOI： 10.1371/journal.pone.0266358 　

    More details Close

    PURPOSE: Evaluation of the clinical performance of computer-aided design/computer-aided manufacturing-produced resin composite crowns (CAD/CAM composite crowns) on molars with a particular focus on placement location. METHODS: A retrospective cohort study was performed based on the clinical records of patients with CAD/CAM composite crowns on molars (June 2016 to March 2021). The hazard ratios (HRs) and 95% confidence intervals (95% CIs) were estimated based the Cox proportional hazard model to evaluate the effect of tooth location on complication type and occurrence. Covariates included crown location (maxilla/mandible, distalmost tooth/not distalmost tooth, and first molar/second or third molar) and endodontically treated (nonvital) or untreated (vital) tooth. RESULTS: Overall, 362 crowns were evaluated (mean follow-up: 378 days, median: 286 days), and 106 crowns (29.3%) showed complications, most frequently crown debonding. The cumulative success and survival rates were 70.9% and 93.7%, respectively, after 1 year and 49.5% and 86.5%, respectively, after 3 years. There was no significant difference in the HRs and log-rank tests in the Kaplan-Meier curves based on crown location parameters (P > 0.05). However, placement on vital teeth was associated with higher risks than on nonvital teeth (HR, 1.55; 95% CI, 1.03-2.23). In addition, the cement as a covariate yielded a high HR. CONCLUSIONS: The location of CAD/CAM composite molar crowns is unlikely a risk factor for complications; therefore, these crowns can be clinically applied to all molars. However, the application of such molar crowns to vital teeth and the use of a cement other than adhesive resin cement present risks.

  5. Impact of adhesive primer and light-curing on polymerization kinetics of self-adhesive resin cement in association with free radical reaction. International-journal Peer-reviewed

    Akane Ozaki, Shunichi Shishido, Keisuke Nakamura, Akio Harada, Yusuke Katsuda, Taro Kanno, Hiroshi Egusa

    European journal of oral sciences　2021/10/21

    DOI： 10.1111/eos.12828 　

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    This study analyzed the impact of adhesive primer and light-curing on the polymerization kinetics of urethane dimethacrylate-based self-adhesive resin cement combined with free radical reaction. Specimens were prepared by mixing the cement paste with or without adhesive primer. Subsequently, specimens were light-cured or set without light-curing. The degree of conversion (DC), Vickers hardness (Hv), and free radical concentrations were repeatedly measured up to 168 h after the curing initiation. Irrespective of the curing procedures, DC, Hv, and free radical concentration rapidly increased during the initial 30 min of curing. The specimens cured with adhesive primer and/or light-curing generally showed higher values of DC, Hv, and radical concentration than those set by chemical curing alone, especially during the initial polymerization phase. Kinetic analysis using a linear mixed model revealed that the adhesive primer had a higher coefficient estimate than light-curing, indicating that the former had a higher impact on the polymerization. Additionally, the adhesive primer alleviated the Hv reduction caused by water and air during the initial polymerization phase, although light-curing hardly prevented the polymerization inhibition. Therefore, we suggest that application of adhesive primer is beneficial to achieve higher degree of conversion and better mechanical properties of self-adhesive resin cements by enhancing free radical reactions.

  6. Mechanical and microstructural properties of ultra-translucent dental zirconia ceramic stabilized with 5 mol% yttria. International-journal Peer-reviewed

    Akio Harada, Shunichi Shishido, Sargon Barkarmo, Ryoichi Inagaki, Taro Kanno, Ulf Örtengren, Hiroshi Egusa, Keisuke Nakamura

    Journal of the mechanical behavior of biomedical materials　111　103974-103974　2020/11

    DOI： 10.1016/j.jmbbm.2020.103974 　

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    Monolithic dental prostheses fabricated from 3 mol.% yttria-stabilized zirconia (3YZ) are becoming increasingly popular. Recently, 5 mol.% yttria-stabilized zirconia (5YZ) which significantly improves the translucency of 3YZ has been prepared. However, its mechanical and microstructural properties, especially those affected by low-temperature degradation (LTD), have not been fully elucidated yet. The objective of the present study was to establish the relationship between the flexural strength of 5YZ with or without autoclave-induced LTD and its microstructural properties. For this purpose, a total of 320 bar-shaped specimens were cut from 5YZ and 3YZ blocks, and half of the specimens in each group were autoclaved at 134 °C for 50 h. Their flexural strengths were determined by conducting three-point bending tests, and the obtained results were analyzed by the Weibull statistical method. Grain sizes and crystalline structures of the specimens were analyzed by scanning electron microscopy (SEM) and X-ray diffraction, respectively. Additionally, the LTD-induced phase transformation was examined by Raman microscopy and cross-sectional surface analysis. The characteristic strengths of 5YZ and 3YZ were approximately 620 and 950 MPa, respectively, and 5YZ was found to be more resistant to LTD in terms of phase transformation than 3YZ. However, a low amount of the monoclinic phase was detected even in 5YZ after 50 h of autoclaving, which significantly decreased its flexural strength and reliability. The results of SEM analysis revealed that 5YZ was composed of two distinct regions: a dominant matrix with large grains (median size: 0.8 μm) and scattered areas with small grains (median size: 0.4 μm). Phase transformation analysis and fractography data indicated that the small-grain region was strongly affected by LTD and likely represented a fracture origin. The described properties should be considered during the clinical application of monolithic 5YZ dental prostheses.

  7. グラスファイバー補強高強度コンポジットレジンブリッジ治療のケースシリーズ研究 Peer-reviewed

    原田 章生, 江草 宏

    東北大学歯学雑誌　37/38/39　(2/1-2/1)　17-25　2020/06

    Publisher: 東北大学歯学会

    ISSN： 0287-3915

  8. A possible risk of CAD/CAM-produced composite resin premolar crowns on a removable partial denture abutment tooth: a 3-year retrospective cohort study Peer-reviewed

    Miura S, Kasahara S, Yamauchi S, Katsuda Y, Harada A, Aida J, Egusa H

    Journal of Prosthodontic Research　63　(1)　78-84　2019/01

    DOI： 10.1016/j.jpor.2018.08.005 　

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    PURPOSE: To evaluate the early performance of computer-aided design/computer-aided manufacturing (CAD/CAM)-produced composite resin crown (CAD/CAM composite crown) treatment on premolars, specifically, placement on a removable partial denture (RPD) abutment tooth, and the distalmost tooth in the dental arch, as possible clinical risk factors. METHODS: A retrospective cohort study (April 2014 to July 2017) was performed utilizing the clinical records of patients who received a premolar CAD/CAM composite crown treatment. The variables of time of treatment for (1) successful crowns (complication event-free) and (2) surviving crowns (clinically functional including re-luted) were estimated using Kaplan-Meier analysis. Survival distributions regarding "RPD abutment tooth" and "distalmost tooth" were analyzed with the log-rank test. Multilevel survival analyses were used to identify hazard ratios and associated risk factors. RESULTS: Five hundred and forty-seven crowns were evaluated (mean follow-up time 1.3±0.9years) in 327 patients. A total of 87 crowns had at least one complication, with loss of crown retention being the most common (70 crowns). Estimated success and survival rates at 3 years were 71.7% and 96.4%, respectively. The risk of complications was significantly higher for an RPD abutment tooth than for a non-RPD abutment tooth. There was no significant difference between the distalmost tooth and non-distalmost tooth in the dental arch. CONCLUSIONS: The demonstrated complication rate for CAD/CAM composite crowns placed on premolars was 15.9% over a period of up to 3 years. There was a substantial risk of complications with placement of such a crown on an RPD abutment tooth.

  9. Influence of microscale expansion and contraction caused by thermal and mechanical fatigue on retentive strength of CAD/CAM-generated resin-based composite crowns. International-journal Peer-reviewed

    Shuhei Ankyu, Keisuke Nakamura, Akio Harada, Ryoichi Inagaki, Yusuke Katsuda, Taro Kanno, Yoshimi Niwano, Ulf Örtengren, Hiroshi Egusa

    Journal of the mechanical behavior of biomedical materials　86　89-97　2018/10

    DOI： 10.1016/j.jmbbm.2018.06.025 　

    ISSN： 1751-6161

    More details Close

    CAD/CAM-generated resin-based composite crowns have been proposed as an inexpensive alternative to conventional crowns. However, concerns have been raised about crown loosening in clinical use. Therefore, the present in vitro study aimed to evaluate the influence of thermal and mechanical cycling (TC and MC) on retentive strength of CAD/CAM resin-based crowns in relation to microscale expansion and contraction caused by fatigue. Eighty standardized dies were produced using a resin-based composite material. Crowns were milled from resin-based composite (n = 40) and glass-ceramic blocks (n = 40; control) using a dental CAD/CAM system. The crowns bonded to the dies were subjected to TC (temperature: 5 and 55 °C, cycles: 50,000) and MC (load: 200 N, cycles: 1.2 million). After fatigue treatment, retentive strength of the crowns was evaluated by a crown pull-off test at a crosshead speed of 1 mm/min. Coefficient of thermal expansion (CTE) and modulus of elasticity (E-modulus) of each material were also analyzed to estimate the microscale expansion and contraction during TC and MC. TC and MC significantly reduced the retentive strength of the CAD/CAM resin-based crowns whereas that of the CAD/CAM ceramic crowns was only affected by TC. In addition, the resin-based crowns showed a higher number of crown loosening during TC than the ceramic crowns. Analyses of CTE and E-modulus indicated that the resin-based crowns would be more deformed during TC and MC than the ceramic crowns. The present study demonstrated that the resistance of crowns to microscale expansion and contraction caused by thermal and mechanical fatigue would play an important role in maintaining retentive strength.

  10. Surface properties of dental zirconia ceramics affected by ultrasonic scaling and low-temperature degradation. International-journal Peer-reviewed

    Kosuke Nakazawa, Keisuke Nakamura, Akio Harada, Midori Shirato, Ryoichi Inagaki, Ulf Örtengren, Taro Kanno, Yoshimi Niwano, Hiroshi Egusa

    PloS one　13　(9)　e0203849　2018

    DOI： 10.1371/journal.pone.0203849 　

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    Zirconia (3Y-TZP) dental prostheses are widely used in clinical dentistry. However, the effect of ultrasonic scaling performed as a part of professional tooth cleaning on 3Y-TZP dental prostheses, especially in conjunction with low-temperature degradation (LTD), has not been fully investigated. The present study aimed to evaluate the influence of ultrasonic scaling and LTD on the surface properties of 3Y-TZP in relation to bacterial adhesion on the treated surface. 3Y-TZP specimens (4 × 4 × 2 mm) were polished and then subjected to autoclaving at 134°C for 100 h to induce LTD, followed by 10 rounds of ultrasonic scaling using a steel scaler tip for 1 min each. Surface roughness, crystalline structure, wettability, and hardness were analyzed by optical interferometry, X-ray diffraction analysis, contact angle measurement, and nano-indentation technique, respectively. Subsequently, bacterial adhesion onto the treated 3Y-TZP surface was evaluated using Streptococcus mitis and S. oralis. The results demonstrated that the combination of ultrasonic scaling and LTD significantly increased the Sa value (surface roughness parameter) of the polished 3Y-TZP surface from 1.6 nm to 117 nm. LTD affected the crystalline structure, causing phase transformation from the tetragonal to the monoclinic phase, and decreased both the contact angle and surface hardness. However, bacterial adhesion was not influenced by these changes in surface properties. The present study suggests that ultrasonic scaling may be acceptable for debridement of 3Y-TZP dental prostheses because it did not facilitate bacterial adhesion even in the combination with LTD, although it did cause slight roughening of the surface.

  11. Fatigue analysis of computer-aided design/computer-aided manufacturing resin-based composite vs. lithium disilicate glass-ceramic Peer-reviewed

    Shuhei Ankyu, Keisuke Nakamura, Akio Harada, Guang Hong, Taro Kanno, Yoshimi Niwano, Ulf Ortengren, Hiroshi Egusa

    EUROPEAN JOURNAL OF ORAL SCIENCES　124　(4)　387-395　2016/08

    DOI： 10.1111/eos.12278 　

    ISSN： 0909-8836

    eISSN： 1600-0722

  12. Effect of low-temperature degradation on the mechanical and microstructural properties of tooth-colored 3Y-TZP ceramics Peer-reviewed

    K. Nakamura, A. Harada, M. Ono, H. Shibasaki, T. Kanno, Y. Niwano, E. Adolfsson, R. Milleding, U. Ortengren

    JOURNAL OF THE MECHANICAL BEHAVIOR OF BIOMEDICAL MATERIALS　53　301-311　2016/01

    DOI： 10.1016/j.jmbbm.2015.08.031 　

    ISSN： 1751-6161

    eISSN： 1878-0180

  13. Cutting efficiency of diamond burs operated with electric high-speed dental handpiece on zirconia Peer-reviewed

    Keisuke Nakamura, Yusuke Katsuda, Shuhei Ankyu, Akio Harada, Taichi Tenkumo, Taro Kanno, Yoshimi Niwano, Hiroshi Egusa, Percy Milleding, Ulf Ortengren

    EUROPEAN JOURNAL OF ORAL SCIENCES　123　(5)　375-380　2015/10

    DOI： 10.1111/eos.12211 　

    ISSN： 0909-8836

    eISSN： 1600-0722

  14. The influence of low-temperature degradation and cyclic loading on the fracture resistance of monolithic zirconia molar crowns Peer-reviewed

    K. Nakamura, A. Harada, T. Kanno, R. Inagaki, Y. Niwano, P. Milleding, U. Ortengren

    JOURNAL OF THE MECHANICAL BEHAVIOR OF BIOMEDICAL MATERIALS　47　49-56　2015/07

    DOI： 10.1016/j.jmbbm.2015.03.007 　

    ISSN： 1751-6161

    eISSN： 1878-0180

  15. Fracture resistance of computer-aided design/computer-aided manufacturing generated composite resin-based molar crowns Peer-reviewed

    Akio Harada, Keisuke Nakamura, Taro Kanno, Ryoichi Inagaki, Ulf Ortengren, Yoshimi Niwano, Keiichi Sasaki, Hiroshi Egusa

    EUROPEAN JOURNAL OF ORAL SCIENCES　123　(2)　122-129　2015/04

    DOI： 10.1111/eos.12173 　

    ISSN： 0909-8836

    eISSN： 1600-0722

  16. Fracture resistance of monolithic zirconia molar crowns with reduced thickness Peer-reviewed

    Keisuke Nakamura, Akio Harada, Ryoichi Inagaki, Taro Kanno, Yoshimi Niwano, Percy Milleding, Ulf Ortengren

    ACTA ODONTOLOGICA SCANDINAVICA　73　(8)　602-608　2015

    DOI： 10.3109/00016357.2015.1007479 　

    ISSN： 0001-6357

    eISSN： 1502-3850

  17. Influence of a new denture cleaning technique based on photolysis of H2O2 on the mechanical properties and color change of acrylic denture base resin Peer-reviewed

    Tatsuro Nakahara, Akio Harada, Yasutomo Yamada, Yu Odashima, Keisuke Nakamura, Ryoichi Inagaki, Taro Kanno, Keiichi Sasaki, Yoshimi Niwano

    DENTAL MATERIALS JOURNAL　32　(4)　529-536　2013/08

    DOI： 10.4012/dmj.2013-047 　

    ISSN： 0287-4547

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Misc. 15

  1. Tooth wearを伴う欠損歯列に対し固定性補綴装置で審美・咬合を回復した症例

    原田 章生

    日本補綴歯科学会誌　15　(東関東支部学術大会特別号)　28-28　2023/03

    Publisher: (公社)日本補綴歯科学会

    ISSN： 1883-4426

    eISSN： 1883-6860

  2. Treatment for dental metal allergy patient Examinations, Diagnosis, Treatment Plan and Cooperation

    秋葉陽介, 細木真紀, 原田章生, 高岡由梨那, 渡邉恵

    日本補綴歯科学会誌(Web)　14　(3)　2022

    ISSN： 1883-6860

  3. 大臼歯CAD/CAM冠治療に関する後ろ向きコホート研究

    猪股 実祐, 原田 章生, 笠原 紳, 勝田 悠介, 尾崎 茜, 木村 葉月, 江草 宏

    日本補綴歯科学会誌　12　(特別号)　175-175　2020/06

    Publisher: (公社)日本補綴歯科学会

    ISSN： 1883-4426

    eISSN： 1883-6860

  4. 小臼歯CAD/CAM冠用レジンブロックで作製した大臼歯クラウンの40症例

    峯 篤史, 大野 彩, 黒崎 陽子, 三野 卓哉, 伴 晋太朗, 腰原 輝純, 細木 真紀, 原田 章生, 江草 宏, 松香 芳三, 佐藤 亨, 窪木 拓男, 矢谷 博文

    日本補綴歯科学会誌　12　(特別号)　266-266　2020/06

    Publisher: (公社)日本補綴歯科学会

    ISSN： 1883-4426

    eISSN： 1883-6860

  5. 咀嚼および審美障害を訴える患者に対して包括的歯科治療で咬合再構成した症例

    唐木 俊英, 原田 章生, 山田 将博, 江草 宏

    日本補綴歯科学会誌　12　(特別号)　269-269　2020/06

    Publisher: (公社)日本補綴歯科学会

    ISSN： 1883-4426

    eISSN： 1883-6860

  6. CAD/CAM冠を介した光照射がデュアルキュア型レジンセメントの接着に及ぼす影響

    尾崎 茜, 原田 章生, 勝田 悠介, 木村 葉月, 江草 宏

    日本補綴歯科学会誌　11　(特別号)　233-233　2019/05

    Publisher: (公社)日本補綴歯科学会

    ISSN： 1883-4426

    eISSN： 1883-6860

  7. 低温劣化処理および超音波スケーリングがジルコニアの表面性状に与える影響

    中澤 晃介, 原田 章生, 江草 宏

    日本歯科理工学会誌　37　(Special Issue71)　39-39　2018/03

    Publisher: (一社)日本歯科理工学会

    ISSN： 1884-4421

  8. 小臼歯CAD/CAM冠の適応症に関する後ろ向きコホート研究

    三浦 賞子, 笠原 紳, 山内 しのぶ, 勝田 悠介, 原田 章生, 江草 宏

    日本補綴歯科学会誌　9　(特別号)　123-123　2017/06

    Publisher: (公社)日本補綴歯科学会

    ISSN： 1883-4426

    eISSN： 1883-6860

  9. CAD/CAM冠用コンポジットレジンの疲労動態解析

    安久 修平, 原田 章生, 菅野 太郎, 江草 宏

    日本補綴歯科学会誌　8　(特別号)　245-245　2016/07

    Publisher: (公社)日本補綴歯科学会

    ISSN： 1883-4426

    eISSN： 1883-6860

  10. 身近な臨床・これからの歯科医のための臨床講座 82 インプラント上部構造に何を選びますか?~知っておきたい歯冠修復材料の特徴~

    原田章生, 山田将博, 江草宏

    日本歯科医師会雑誌　69　(1)　41‐47,1-47,1　2016/04/10

    Publisher: 日本歯科医師会

    ISSN： 0047-1763

  11. CAD/CAM法による大臼歯硬質レジンジャケットクラウンの強度試験

    原田 章生, 菅野 太郎, 稲垣 亮一, 佐々木 啓一

    日本補綴歯科学会誌　6　(特別号)　204-204　2014/05

    Publisher: (公社)日本補綴歯科学会

    ISSN： 1883-4426

    eISSN： 1883-6860

  12. 新歯冠用硬質レジンの物理的性質に関する研究

    泉田 明男, 笠原 紳, 加藤 裕光, 稲垣 亮一, 石橋 実, 奥山 弥生, 三浦 賞子, 原田 章生, 佐々木 啓一

    日本補綴歯科学会誌　6　(特別号)　298-298　2014/05

    Publisher: (公社)日本補綴歯科学会

    ISSN： 1883-4426

    eISSN： 1883-6860

  13. 新歯冠用硬質レジンの物理的性質に関する研究

    泉田明男, 笠原紳, 加藤裕光, 稲垣亮一, 石橋実, 奥山弥生, 三浦賞子, 原田章生, 佐々木啓一

    日本補綴歯科学会学術大会プログラム・抄録集　123rd　298　2014/04/01

    ISSN： 1883-4426

  14. CAD/CAM法による大臼歯硬質レジンジャケットクラウンの強度試験

    原田章生, 菅野太郎, 稲垣亮一, 佐々木啓一

    日本補綴歯科学会学術大会プログラム・抄録集　123rd　204　2014/04/01

    ISSN： 1883-4426

  15. 過酸化水素光分解殺菌技術を応用した新規義歯先浄システムが床用レジンに及ぼす影響

    原田章生, 中原達郎, 山田康友, 小田島優, 稲垣亮一, 菅野太郎, 佐々木啓一

    日本補綴歯科学会学術大会プログラム・抄録集　122nd　178　2013/05/01

    ISSN： 1883-4426

Show all ︎Show first 5

Presentations 20

  1. A case report of aesthetic and occlusal recovery using fixed prostheses in partially edentulous arch with tooth wear

    Harada Akio

    2023/03/12

  2. 基礎研究・臨床研究から考えるCAD/CAM冠の特徴 Invited

    原田章生

    一般社団法人 日本歯科技工学会 北海道・東北支部 令和4年度学術大会　2022/11/26

  3. 市民フォーラム 正しく知ろう，保険でできる白い奥歯 「大臼歯まで適応になった保険の白い被せ物 コンピュータでつくるCAD/CAM冠のおはなし」 Invited

    原田章生

    令和4年度 公益社団法人日本補綴歯科学会東北・北海道支部学術大会　2022/10/15

  4. 限られた臼歯部補綴スペースに対してインプラント治療を用いて口腔機能を回復した症例

    原田章生

    日本補綴歯科学会第131会学術大会　2022/07/17

  5. 歯科金属アレルギー患者への対応〜検査、診断、治療方針と他科連携〜 Invited

    秋葉 陽介, 細木 真紀, 原田 章生, 高岡 由梨那, 渡邉 恵

    日本補綴歯科学会第130回記念学術大会　2021/06/20

  6. 小臼歯CAD/CAM冠用レジンブロックで作製した大臼歯クラウンの40症例

    峯 篤史, 大野 彩, 黒﨑陽子, 三野卓哉, 伴晋太郎, 腰原輝純, 細木真紀, 原田章生, 江草 宏, 松香芳三, 佐藤 亨, 窪木拓男, 矢谷博文

    日本補綴歯科学会第129回学術大会　2020/06/27

  7. 咀嚼および審美障害を訴える患者に対して包括的歯科治療で咬合再構成した症例

    唐木俊英, 原田章生, 山田将博, 江草 宏

    日本補綴歯科学会第129回学術大会　2020/06/27

  8. 大臼歯CAD/CAM冠治療に関する後ろ向きコホート研究

    猪股実祐, 原田章生, 笠原 紳, 勝田悠介, 尾崎 茜, 木村葉月, 江草 宏

    日本補綴歯科学会第129回学術大会　2020/06/27

  9. 高透光性歯科用ジルコニアの微細構造評価

    宍戸駿一, 原田章生, 稲垣亮一, 菅野太郎, 江草 宏

    令和元年度 日本補綴歯科学会 東北・北海道支部学術大会　2019/10/20

  10. 酸蝕症によるTooth wearに対し全顎的に補綴処置を行った症例

    原田章生

    東北大学歯学部同窓会 第34回卒後研修会 前日プレイベント会員症例発表　2019/10/19

  11. Flare-up Reaction During Treatment of Dental Metal Allergy International-presentation

    Harada A, Yamada M, Ko N, Mine A, Yatani H, Egusa H

    International Association for Dental Research　2019/06/21

  12. CAD/CAM冠を介した光照射がデュアルキュア型レジンセメントの接着に及ぼす影響

    尾崎 茜, 原田章生, 勝田悠介, 木村葉月, 江草 宏

    日本補綴歯科学会第128回学術大会　2019/05/12

  13. 低温劣化処理および超音波スケーリングがジルコニアの表面性状に与える影響

    中澤晃介, 原田章生, 江草 宏

    日本歯科理工学会第71回春季学術講演会　2018/04/14

  14. CAD/CAM冠症例の適応症に関する後ろ向きコホート研究

    三浦賞子, 笠原 紳, 山内しのぶ, 勝田悠介, 原田章生, 江草 宏

    日本補綴歯科学会第126回学術大会　2017/07/01

  15. CAD/CAM冠用コンポジットレジンの疲労動態解析

    安久修平, 原田章生, 菅野太郎, 江草 宏

    日本補綴歯科学会第125回学術大会　2016/07/09

  16. ハイブリッドレジンCAD/CAM冠症例の短期予後調査

    三浦賞子, 笠原 紳, 山内しのぶ, 岡崎恵子, 勝田悠介, 原田章生, 江草 宏

    平成27年度公益社団法人日本補綴歯科学会東北・北海道支部 総会・学術大会　2015/10/25

  17. Fracture Strength of CAD/CAM-Generated Composite Resin Molar Crowns International-presentation

    Harada A, Nakamura K, Kanno T, Inagaki R, Ortengren U, Niwano Y, Sasaki K, Egusa H

    International Association for Dental Research　2015/03/11

  18. 新規歯冠用硬質レジンによるジャケットクラウンの破壊様相

    相澤なみき, 原田章生, 木村真也, 泉田明男, 笠原 紳, 三浦賞子, 加藤裕光

    第36回日本歯科技工士学会　2014/09/20

  19. 新歯冠用硬質レジンの物理的性質に関する研究

    泉田明男, 笠原 紳, 加藤裕光, 稲垣亮一, 石橋 実, 奥山弥生, 三浦賞子, 原田章生, 佐々木啓一

    日本補綴歯科学会第123回学術大会　2014/05/24

  20. CAD/CAM法による大臼歯硬質レジンジャケットクラウンの強度試験

    原田章生, 菅野太郎, 稲垣亮一, 佐々木啓一

    日本補綴歯科学会第123回学術大会　2014/05/24

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Research Projects 3

  1. カチオン性重合開始剤を用いた新規抗菌性ナノポリマーの開発と歯科材料への応用

    原田 章生

    Offer Organization: 日本学術振興会

    System: 科学研究費助成事業

    Category: 基盤研究(C)

    Institution: 東北大学

    2024/04/01 - 2027/03/31

  2. Research on optimal material properties of CAD/CAM crowns focusing on deformation behavior during fatigue. Competitive

    Harada Akio

    Offer Organization: Japan Society for the Promotion of Science

    System: Grants-in-Aid for Scientific Research

    Category: Grant-in-Aid for Early-Career Scientists

    Institution: Tohoku University

    2019/04 - 2022/03

    More details Close

    The fracture strength of CAD/CAM generated composite resin crowns was evaluated to determine whether it is affected by the abutment tooth and type of luting cement. In addition to final fracture strength, initial fracture strength was evaluated by detecting acoustic emissions. Only the combination of metal abutment and composite resin cement showed significantly lower final fracture strength. On the other hand, initial fracture strength showed a different trend, with the combination of composite resin abutment and composite resin cement showing higher initial fracture strength for crowns and lower initial fracture strength for metal abutments. Considering the deformation behavior of the specimens under load, it is suggested that the combination of materials with similar modulus of elasticity might affect the initial fracture strength.

  3. 若手研究B：フルカントゥア・ジルコニア歯冠補綴装置の低温劣化の防止・抑制法の探索 Competitive

    Harada Akio, Egusa Hiroshi, Nakamura Keisuke, Nakazawa Kosuke

    Offer Organization: Japan Society for the Promotion of Science

    System: Grant-in-Aid for Scientific Research

    Category: Grant-in-Aid for Young Scientists (B)

    Institution: Tohoku University

    2016/04 - 2019/03

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    The purpose of this study was to evaluate the influence of ultrasonic scaling and low-temperature degradation (LTD) on surface properties of zirconia. Yttria-stabilized tetragonal zirconia polycrystals (3Y-TZP) were aged by autoclaving at 135℃ and 0.2 MPa for 100 hours comparable to 5 years intraoral aging, subsequently treated by ultrasonic scaler tips made of PEEK or stainless steel. X-ray diffraction analysis showed that LTD induced phase transformation whereas ultrasonic scaling did not generate monoclinic phase. Ultrasonic scaling significantly increased Sa (P <0.0001), especially when LTD-induced 3Y-TZP was subjected to ultrasonic scaling using stainless steel tip.