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Development of inner surface machining design as micro retentive groove to prevent debonding of CAD / CAM crown

Research Project

Project/Area Number 18K09710
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Review Section Basic Section 57050:Prosthodontics-related
Research InstitutionThe Nippon Dental University

Principal Investigator

SHINYA AKIKAZU  日本歯科大学, 生命歯学部, 教授 (60440054)

Co-Investigator(Kenkyū-buntansha) 白鳥 沙久良 (清水沙久良)  日本歯科大学, 生命歯学部, 助教 (20804074)
Project Period (FY) 2018-04-01 – 2022-03-31
Project Status Completed (Fiscal Year 2021)
Budget Amount *help
¥4,420,000 (Direct Cost: ¥3,400,000、Indirect Cost: ¥1,020,000)
Fiscal Year 2021: ¥390,000 (Direct Cost: ¥300,000、Indirect Cost: ¥90,000)
Fiscal Year 2020: ¥390,000 (Direct Cost: ¥300,000、Indirect Cost: ¥90,000)
Fiscal Year 2019: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2018: ¥2,340,000 (Direct Cost: ¥1,800,000、Indirect Cost: ¥540,000)
KeywordsCAD/CAM / CAD/CAM冠 / 機械的嵌合力 / 接着歯学 / 被着面処理 / 嵌合効力 / 接着強さ / デジタルデンティストリー / 押し出し接着強さ / 機械加工 / ミリング / 脱離 / 引抜き試験 / 接着 / CAD/CAM / クラウン
Outline of Final Research Achievements

The inner surface of the crown milled using CAD/CAM system is provided with a "groove (Micro Retentive Groove, hereafter MRG)" that provides an undercut to maximize the mechanical bonding behavior. We constructed a machining program that can be demonstrated and the crown debonding can be reduced. From the results, it was clarified that the highest adhesive strength was obtained when the depth of MRG was 100 μm, and that the effect was observed regardless of the type of luting material tested. In addition, the evaluation of the crown shape, it was clarified that it is most effective MRG design was that with 40 μm cement space, and a depth of 100 μm MRG milled in the center of the crown height on the inner surface. Three MRGs are recommended for maximum bonding effect.

Academic Significance and Societal Importance of the Research Achievements

金属価格の高騰からレジンブロックから切削加工されたCAD/CAM冠の需要が大幅に躍進している.そのCAD/CAM冠の装着にはクラウン内面に対して装着直前のアルミナブラスト処理とシラン処理が必須となっている.また,装着材料には接着性レジンセメントが推奨されていることから,装着時には多くの煩雑な前処理が必要となっている.本研究の結果から,クラウン製作時,冠内面に100μmのMRGを3本付与するだけで,クラウン内面への前処理が必要なくなり,装着術式の簡便化が可能となった.このことから,テクニカルエラーの低減も期待でき,安全な医療を国民に提供可能となったと考える.

Report

(5 results)
  • 2021 Annual Research Report   Final Research Report ( PDF )
  • 2020 Research-status Report
  • 2019 Research-status Report
  • 2018 Research-status Report
  • Research Products

    (8 results)

All 2019 2018 Other

All Int'l Joint Research (2 results) Presentation (6 results) (of which Int'l Joint Research: 1 results)

  • [Int'l Joint Research] The University of Hong Kong/Faculty of Dentistry AppliedOralSciences/Dental Materials Science(中国)

    • Related Report
      2018 Research-status Report
  • [Int'l Joint Research] University of Leuven/Department of Oral Health Sciences/Biomaterials Research group(ベルギー)

    • Related Report
      2018 Research-status Report
  • [Presentation] ジルコニア内面に付与した溝が接着強さにおよぼす影響2019

    • Author(s)
      新妻瑛紀,新谷明一,藤島伸,白鳥沙久良,黒田聡一,八田みのり,木内徹,用丸英則,五味治徳
    • Organizer
      日本補綴歯科学会第128回学術大会
    • Related Report
      2019 Research-status Report
  • [Presentation] ジルコニア内面に付与した溝の深さが押し出し接着強さにおよぼす影響2019

    • Author(s)
      新妻瑛紀,新谷明一,勝沼昌太郎,藤島 伸,白鳥沙久良,八田みのり,五味治徳
    • Organizer
      第38回日本接着歯学会学術大会
    • Related Report
      2019 Research-status Report
  • [Presentation] CAD/CAM冠に対する溝付与の位置が接着強さと破壊形態とにおよぼす影響2018

    • Author(s)
      新妻瑛紀,新谷明一,藤島 伸,白鳥沙久良,黒田聡一,八田みのり,片桐慎吾,小林茂之,五味治徳
    • Organizer
      日本補綴歯科学会第127回学術大会
    • Related Report
      2018 Research-status Report
  • [Presentation] Effect of position of Micro Retentive Groove for Bond Strength2018

    • Author(s)
      A Niitsuma,A Shinya,S Shiratori,M Hatta,H Gomi
    • Organizer
      96th IADR General Session and Exhibition
    • Related Report
      2018 Research-status Report
    • Int'l Joint Research
  • [Presentation] CAD/CAMレジン冠内面に付与した溝の本数が接着強さにおよぼす影響2018

    • Author(s)
      新妻瑛紀,新谷明一,藤島 伸,白鳥沙久良,五味治徳
    • Organizer
      第37回日本接着歯学会学術大会
    • Related Report
      2018 Research-status Report
  • [Presentation] CAD/CAMレジンクラウン内面に付与した溝の数が接着強さにおよぼす影響2018

    • Author(s)
      新妻瑛紀,新谷明一,藤島 伸,白鳥沙久良,黒田聡一,八田みのり,長田博史,五味治徳
    • Organizer
      日本補綴歯科学会平成30年度東京支部総会・第22回学術大会
    • Related Report
      2018 Research-status Report

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Published: 2018-04-23   Modified: 2023-01-30  

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