| Project/Area Number |
05454531
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| Research Category |
Grant-in-Aid for General Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Research Field |
補綴理工系歯学
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| Research Institution | Nagasaki University |
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Principal Investigator |
ATSUTA Mitsuru Nagasaki University, School of Dentistry, Professor, 歯学部, 教授 (60002135)
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| Co-Investigator(Kenkyū-buntansha) |
YOSHIDA Keiichi Nagasaki University, School of Dentistry, Assistant Professor, 歯学部, 講師 (70230729)
MATSUMURA Hideo Nagasaki University, School of Dentistry, Assistant Professor, 歯学部, 講師 (40199857)
TANAKA Takuo Nagasaki University, School of Dentistry, Associate Professor, 歯学部, 助教授 (40113584)
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| Project Period (FY) |
1993 – 1995
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| Project Status |
Completed (Fiscal Year 1995)
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| Budget Amount *help |
¥6,400,000 (Direct Cost: ¥6,400,000)
Fiscal Year 1995: ¥1,100,000 (Direct Cost: ¥1,100,000)
Fiscal Year 1994: ¥2,100,000 (Direct Cost: ¥2,100,000)
Fiscal Year 1993: ¥3,200,000 (Direct Cost: ¥3,200,000)
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| Keywords | ceramic-resin composite / three-body wear-testing device / composte resin veneering material / metal primer / porcelain primer / age-hardenable gold alloy at intraoral temperature / adhesive resin cement |
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| Research Abstract |
During an observation period of the last several years, the authors have experienced fractured cases of molar restorations made of a castable ceramic material (OCC), which is trusted to be the strongest ceramic material. The new composite material therefore was applied to a buccal and a part of occlusal surfaces as a veneering agent of composite resin veneered restorations. This system requires bonding between resin or ceramic material and titanium or age-hardenable gold alloy. Hence appropriate bonding systems for the veneer-substructure combinations were ascertained using metal and ceramic primers. The results have alreaby been published in the research reports.
The distribution of occlusal forces were evaluated by means of a occlusal force determination system (Occluzer). The results indicate that there was no significant difference in distribution of occlusal forces between the base line and after six months. The composite material applied to a part of occlusal surface did not generate any problem. Further observation should be necessary for prediction of rate of clinical success. Scanning electron microscopic observation of in vivo occlusal wear through the use of replicated cast also did not show apparent difference between the two observation periods except for detection of slight wear of the resin portion. By the end of the experimental period, several improvements in computer software of the apparatus were accomplished. These version-ups enabled calculation of bonded area as well as displaying the results in situ. The system is then capable of analyzing data of numerous cases within shorter period of time as compared to the conventional system. The restorations are being continuously observed by the authors and the forthcoming results may indicate that the restorations made of our system are proved to be so called the balanced-worn or the equi-occlusal-force-distributed system.
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