| Project/Area Number |
08557109
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| Research Category |
Grant-in-Aid for Scientific Research (A)
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| Allocation Type | Single-year Grants |
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| Section | 展開研究 |
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| Research Field |
補綴理工系歯学
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| Research Institution | HIROSHIMA UNIVERSITY |
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Principal Investigator |
WADAMOTO Masayoshi Hiroshima Univ.School of Dentistry, Assistant Professor, 歯学部・附属病院, 講師 (70231040)
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| Co-Investigator(Kenkyū-buntansha) |
TANIMOTO Keiji Hiroshima Univ.School of Dentistry, Professor, 歯学部, 教授 (10116626)
KOMURA Ikuhiro Hiroshima Univ.School of Dentistry, Research Assistant, 歯学部・附属病院, 助手 (70284213)
KUBO Takayasu Hiroshima Univ.School of Dentistry, Research Assistant, 歯学部, 助手 (60240876)
SATO Yuuji Hiroshima Univ.School of Dentistry, Associate Professor, 歯学部, 助教授 (70187251)
AKAGAWA Yasumasa Hiroshima Univ.School of Dentistry, Professor, 歯学部, 教授 (00127599)
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| Project Period (FY) |
1996 – 1997
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| Project Status |
Completed (Fiscal Year 1997)
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| Budget Amount *help |
¥18,600,000 (Direct Cost: ¥18,600,000)
Fiscal Year 1997: ¥600,000 (Direct Cost: ¥600,000)
Fiscal Year 1996: ¥18,000,000 (Direct Cost: ¥18,000,000)
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| Keywords | pQCT / implant / monkey / bone quality / three-dimentional / bone mineral density / 骨接触率 / pQCT / 三次元構築 / CT |
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| Research Abstract |
we measured bone mineral density in the mandibular edentulous jaw (M_1P_2P_1|P_1P_2M_1) of four monkeys, with an image analysis system (peripheral Quantitative Computed Tomography (pQCT) apparatus) for the bone volume evaluation. Three of four monkeys were measured bone mineral density immediately before implant insertion after three months of extraction, one of them were done after one, two and three months of post-extraction.
Although the mean of 2.55% of photography errors was occurred by pQCT apparatus, the reappearance accuracy as much as conventional specification computed tomography was obtained. Significant correlation was recognized with coefficient of correlation r=0.78 between the bone quality classification (Lekholm et al.) by operation findings and bone mineral density of implant sites (P<0.01).
It is recognized significant correlation with coefficient of correlation r=0.64, as the contrast between bone mineral density and the three-dimensional histologic evaluation of implant placement site by three-dimensional jaw bone examination are carried out (P<0.05). In other words, it is obvious that when bone mineral density of the cancellous bone is 400-600 mg/cm^3, the bone contact ratio is around 50%, when the bone mineral density is more than 800 mg/cm^3, the bone contact ratio be over 60%.
The development of three-dimensional jaw bone examination and evaluation systems that give such suggestion that selects an optimum implant corresponding to the bone quality, by changing loading conditions after the insertion of implant or implant design from now on, is produced.
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