Study on tooth micro crack using biomechnical fatigue bending strength test

2021 Fiscal Year Final Research Report

• Project/Area Number: 19K10158
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Review Section: Basic Section 57030:Conservative dentistry-related
• Research Institution: Nihon University
• Principal Investigator: TAKAMIZAWA Toshiki 日本大学, 歯学部, 准教授 (60373007)
• Project Period (FY): 2019-04-01 – 2022-03-31
• Keywords: マイクロクラック / tooth wear / 衝突摩耗 / タッピングモーション

Outline of Final Research Achievements

Sliding and impact wear simulations were performed using bovine enamel specimens to determine wear behavior and generation of microcracks. Different chewing patterns, tapping and grinding, were simulated. Specimens were profiled using confocal laser scanning microscopy, and the mean maximum depth were measured. Scanning electron microscopy was also performed. The mean maximum depth of wear values differed according to the number of mastication cycles, with a higher number of cycles producing higher depths of wear. The facet wear depth was significantly greater with the tapping pattern than with the grinding pattern. SEM observation of the wear facets revealed that surface textures at the edges were rougher than those at the center of all facets. The results of this study indicated that the patterns and number of cycles of mastication affected the wear progression of enamel.

Free Research Field

歯科保存学

Academic Significance and Societal Importance of the Research Achievements

本研究の結果から，咬合様式の違いはエナメル質の摩耗深さに影響を及ぼすとともにマイクロクラックの発生および進展に密接に関与することが判明した。特に，タッピングパターンの咬合様式は，エナメルマイクロクラックの起点となるとともにその摩耗の進行もグライディングパターンに比較して大きいところから，Tooth wearの進行にはタッピングパターンが深く関与していることが示唆された。これらの研究結果から，エナメル質に生じるマイクロクラックの発生およびtooth wearの進行は，タッピングモーションを有するブラキサーにおいて過度に進行する可能性を示唆し，今後の予防法にエビデンスを与えるものとなった。