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Fatigue analysis of resin-based composite molar crowns fabricated via CAD/CAM technique

Research Project

Project/Area Number 16K11583
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Research Field Prosthodontics/ Dental materials science and
Research InstitutionTohoku University

Principal Investigator

Ryoichi Inagaki  東北大学, 歯学研究科, 講師 (60260444)

Co-Investigator(Kenkyū-buntansha) 中村 圭祐  東北大学, 歯学研究科, 准教授 (30431589)
Project Period (FY) 2016-04-01 – 2019-03-31
Project Status Completed (Fiscal Year 2018)
Budget Amount *help
¥4,680,000 (Direct Cost: ¥3,600,000、Indirect Cost: ¥1,080,000)
Fiscal Year 2018: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2017: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2016: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000)
KeywordsCAD/CAM / 硬質レジンクラウン / セラミッククラウン / 強度 / 疲労 / 脱離 / レジン / クラウン / 熱膨張 / 冠橋義歯補綴学 / デジタル歯科
Outline of Final Research Achievements

In the present research project, strength, fatigue resistance, and crown retentive strenght of CAD/CAM-generated resin-based composite crowns were evaluated. Fatigue treatments, such as thermal cycling and mechanical cycling designed in relation to the clinical service of crowns in the oral cavity, were performed. The fatigue did not significantly affect the strength of the crown material (resin-based composite) and the crown fracture resistance. However, the fatigue decreased the crown retentive strength, increasing the risk of loss of retention. Thus, it is suggeted that future research and development should focus on prevention of crown loosening of CAD/CAM-generated resin-based composite crowns to achieve better clinical results.

Academic Significance and Societal Importance of the Research Achievements

歯科用CAD/CAM技術の発展に伴い、樹脂製のクラウンの臨床応用が進んでいる。しかしながら、それらのクラウンの長期的な安定性に関する評価が不足しているのが現状である。そこで、本研究では、口腔内でクラウンが機能することを想定した疲労試験を行い、強度、耐疲労性、接着性に関する長期安定性のデータを集積することを目的とした。結果としては、CAD/CAMで製作した樹脂製クラウンは強度および耐疲労性に関して問題がないことが分かった。しかしながら、疲労によりクラウンの脱離が生じるリスクが増加するため、今後も継続して樹脂製クラウン脱離防止に関する研究を継続していく必要性が示唆された。

Report

(4 results)
  • 2018 Annual Research Report   Final Research Report ( PDF )
  • 2017 Research-status Report
  • 2016 Research-status Report
  • Research Products

    (6 results)

All 2018 2016 Other

All Int'l Joint Research (2 results) Journal Article (4 results) (of which Int'l Joint Research: 4 results,  Peer Reviewed: 4 results,  Open Access: 1 results)

  • [Int'l Joint Research] イエテボリ大学/マルメ大学/スウェーデン王立工科大学(スウェーデン)

    • Related Report
      2018 Annual Research Report
  • [Int'l Joint Research] イエテボリ大学(スウェーデン)

    • Related Report
      2016 Research-status Report
  • [Journal Article] Influence of microscale expansion and contraction caused by thermal and mechanical fatigue on retentive strength of CAD/CAM-generated resin-based composite crowns2018

    • Author(s)
      Ankyu S, Nakamura K, Harada A, Inagaki R, Katsuda Y, Kanno T, Niwano Y, Ortengren U, Egusa H
    • Journal Title

      J Mech Behav Biomed Mater

      Volume: 86 Pages: 89-97

    • DOI

      10.1016/j.jmbbm.2018.06.025

    • Related Report
      2018 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Surface properties of dental zirconia ceramics affected by ultrasonic scaling and low-temperature degradation2018

    • Author(s)
      Nakazawa K, Nakamura K, Harada A, Shirato M, Inagaki R, Ortengren U, Kanno T, Niwano Y, Egusa H.
    • Journal Title

      PLoS One

      Volume: 13 Issue: 9 Pages: e0203849-e0203849

    • DOI

      10.1371/journal.pone.0203849

    • Related Report
      2018 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Critical considerations on load-to-failure test for monolithic zirconia molar crowns2018

    • Author(s)
      Nakamura K, Ankyu S, Nilsson F, Kanno T, Niwano Y, Vult von Steyern P, Ortengren U
    • Journal Title

      J Mech Behav Biomed Mater

      Volume: 87 Pages: 180-189

    • DOI

      10.1016/j.jmbbm.2018.07.034

    • Related Report
      2018 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Fatigue analysis of computer-aided design/computer-aided manufacturing resin-based composite vs. lithium disilicate glass-ceramic2016

    • Author(s)
      Ankyu S, Nakamura K, Harada A, Hong G, Kanno T, Niwano Y, Ortengren U, Egusa H
    • Journal Title

      Eur J Oral Sci

      Volume: 124 Issue: 4 Pages: 387-395

    • DOI

      10.1111/eos.12278

    • Related Report
      2016 Research-status Report
    • Peer Reviewed / Int'l Joint Research

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Published: 2016-04-21   Modified: 2020-03-30  

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