| Project/Area Number |
02670881
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| Research Category |
Grant-in-Aid for General Scientific Research (C)
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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 | Asahi University |
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Principal Investigator |
ADACHI Masanori Asahi University, School of Dentistry Assistant, 歯学部, 助手 (60076057)
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| Co-Investigator(Kenkyū-buntansha) |
WAKAMATU Nobukazu Asahi University, School of Dentistry Assistant, 歯学部, 助手 (00158594)
GOTO Takayasu Asahi University, School of Dentistry Lecturer, 歯学部, 講師 (30121320)
DOI Yutaka Asahi University, School of Dentistry Associate Professor, 歯学部, 助教授 (40116067)
MORIWAKI Yutaka Asahi University, School of Dentistry Professor, 歯学部, 教授 (90028738)
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| Project Period (FY) |
1990 – 1991
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| Project Status |
Completed (Fiscal Year 1991)
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| Budget Amount *help |
¥1,000,000 (Direct Cost: ¥1,000,000)
Fiscal Year 1991: ¥1,000,000 (Direct Cost: ¥1,000,000)
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| Keywords | Hydroxyapatite / Sinter / Electron Spin Resonance (ESR) / Sintering Process / Carbonate / Complex / Fiber / Knoop Hardness / アパタイト / 骨アパタイト / 複合化 / 焼結助剤 / 電子スピン共鳴法 / 溶解性 |
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| Research Abstract |
The purpose of this study is to examine the sintering process of hydroxyapatite (HAp) in detail by using the behavior of the ESR signal intensity of Mn^<2+> naturally present in HAp as impurity and the possibility of the complex with fiber by lowering the sintering temperature.
It is evident that rearrangment of ion species including Mn^<2+> occures only on the surface layer of the HAp particles at lower temperature and diffuses inner lattice homogeneously with increasing of firing temperature. So far, sintering process of HAp was measured only indirectly by thermo mecanical analysis (TMA), but this ESR mesurement can trace the behavior of ion directly, and can elucidate the mechanism of sintering. Therefore, there pissibility that it can be applied not only in hydroxyapatite, but in other ceramics or harding process of many dental materials.
Furthermore, by IR analysis, it was proved that the present of carbonate (CO_3^<2->) including in HAp effected on lowering the sintering temperature. The physical properties of sintered bodies of HAp with lowering the sintering temperature was examined. For example, the CO_3-HAp samples containing more than 8wt% carbonate could be sintered at temperatures below 700ﾟC. The knoop hardness of 11.3wt% Co_3-HAp sintered at 650ﾟC for 2hr was about 350, which is comparable to that of enamel. Chemical and IR analysis of this samples showed that about 6wt% carbonate still remained in the HAp lattice resembling bone apatite.
The possibility of the fiber-apatite complex is examined by this method now.
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