| Project/Area Number |
13470411
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
補綴理工系歯学
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| Research Institution | Tokyo Medical and Dental University |
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Principal Investigator |
TAKAHASHI Hidekazu Tokyo Medical & Dental Univ., Associate Professor, 大学院・医歯学総合研究科, 助教授 (90175430)
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| Co-Investigator(Kenkyū-buntansha) |
NISHIKAWA Izuru Osaka Institute of Technology, Professor, 大工学部, 教授 (90189267)
TAKAHIRO Sato Tokyo Medical & Dental Univ., Research Associate, 大学院・医歯学総合研究科, 助手 (70178747)
KUROSAKI Norimasa Tokyo Medical & Dental Univ., Professor, 大学院・医歯学総合研究科, 教授 (40014154)
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| Project Period (FY) |
2001 – 2003
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| Project Status |
Completed (Fiscal Year 2003)
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| Budget Amount *help |
¥13,600,000 (Direct Cost: ¥13,600,000)
Fiscal Year 2003: ¥800,000 (Direct Cost: ¥800,000)
Fiscal Year 2002: ¥2,500,000 (Direct Cost: ¥2,500,000)
Fiscal Year 2001: ¥10,300,000 (Direct Cost: ¥10,300,000)
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| Keywords | Dental ceramics / Fatigue properties / Oral cavity silumation / Cyclic fatigue / Static fatigue / Crack propagete paremeter / Biaxial flexiral strength / Dentin / 歯冠修復用セラミック / 口腔内疑似環境保管 / 2軸曲げ試験 / ステアケース法 / 亀裂成長進展パラメータ |
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| Research Abstract |
In this study, fatigue properties of dental restorative ceramics after oral cavity simulated environment, fracture analysis of clinical case and relationship between basic fatigue behavior and clinical failure of dental ceramics were evaluated. Storage in dilled water at 37 degrees Celsius was selected as oral cavity simulated environment and the biaxial flexural test was employed for evaluating fatigue behavior. Static and cyclic fatigue of two dental restorative ceramics were measured before and after one year storage in oral cavity simulated environment. A castable ceramics exhibited decreases of static and cyclic fatigue properties, while a heat pressable ceramics showed increases of static and cyclic fatigue properties. These phenomena might be due to reaction of surface texture of ceramics with water, but more detailed investigations are required. Effects of longer storage are now continuously investigated.
Moreover, the effect of immersion solutions on bovine dentin on fatigue strength was evaluated and the effects of solutions were considered not significant.
Regarding clinical case of dental ceramics fracture, number of collected fracture cases were a very few. It was necessary to collect more fracture cases for evaluating relationship between the fatigue properties and clinical fracture.
A part of these results were already presented several international scientific meeting such as IADR and preparing for publication.
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