| Project/Area Number |
17592014
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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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 | Tohoku University |
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Principal Investigator |
TOYODA Joji Tohoku University, Hospital, Assistant, 病院, 助手 (00250796)
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| Co-Investigator(Kenkyū-buntansha) |
YODA Masanobu Tohoku University, Graduate School of Dentistry, Associate Professor, 大学院歯学研究科, 助教授 (70005073)
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| Project Period (FY) |
2005 – 2006
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| Project Status |
Completed (Fiscal Year 2006)
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| Budget Amount *help |
¥2,800,000 (Direct Cost: ¥2,800,000)
Fiscal Year 2006: ¥800,000 (Direct Cost: ¥800,000)
Fiscal Year 2005: ¥2,000,000 (Direct Cost: ¥2,000,000)
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| Keywords | wear / wear test / friction Coefficient / enamel / dental restorative material |
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| Research Abstract |
An important feature of materials used in the restoration of occlusal surface of fixed prosthodontics is resistance to wear and the lack of a negative influence on the opposite teeth. The choice of materials used for the restoration of occlusal surfaces should show mechanical resistance to de formation, including attrition. Two aspects of interest when discussing prosthetic materials used for occlusal surfaces are the resistance to abrasive wear of the prosthetic material, and the predisposition of the materials to create wear of the opposing occlusal surfaces on natural or artificial dentition. This in vitro investigation of wear evaluated the physical and tribological characteristics of 5 restorative materials and dental enamel. Three dental metals, dental porcelain, composite resin and human enamel were used. Occlusal contact wear was simulated in a sliding wear tester. Five specimens of each material were tested in a pin-on-plate design with oscillating sliding at a vertical load of 49N. The horizontal excursion of the antagonist was 3 mm. Wear was quantified by 50,000 cycles. The wear values for porcelain opposing composite resin or porcelain were significantly greater than others.
Frictional forces play a major role in the oral wear process of dental restorative materials and it would be of interest to consider how the energy from friction is dissipated at the material surface. The aim of the current investigation was to determine the relationship between the dissipation of frictional energy and the wear characteristics. Friction coefficient of 5 restorative materials and dental enamel, used by wear test were evaluated. However, the evaluation of friction coefficient and wear of dental materials in this study has identified no relationship between these two factors.
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