| Project/Area Number |
61570925
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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 | Tokyo Medical and Dental University |
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Principal Investigator |
ICHINOSE Sizuko Department of Dental Technology, Faculty of Dentistry, Tokyo Medical and Dental University, 歯学部, 技官 (60014156)
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| Project Period (FY) |
1986 – 1988
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| Project Status |
Completed (Fiscal Year 1988)
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| Budget Amount *help |
¥1,800,000 (Direct Cost: ¥1,800,000)
Fiscal Year 1988: ¥100,000 (Direct Cost: ¥100,000)
Fiscal Year 1987: ¥100,000 (Direct Cost: ¥100,000)
Fiscal Year 1986: ¥1,600,000 (Direct Cost: ¥1,600,000)
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| Keywords | dental Ag-Pd-Cu-Au alloy / body fluids / 血清 / 溶出挙動 / 表面状態 / 溶出量 / 組織構造 |
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| Research Abstract |
Problems arise regarding toxicity, corrosion behavior and tarnish of dental restorative and implant metals, since metal ions release into the body fluids. Corrosion behavior and surface appearance of dental alloys in fluids containing amino acid and protein were studied. 1% NaCl solution and artificial saliva were also investigated for comparison.
Electrochemical behavior Dental Ag-Pd-Cu-Au alloy was immersed in 1% NaCl solution, artificial saliva and human saliva, and an electrochemical measurements were performed on the alloy. It was found that the rest-potential of the alloy in the 1% NaCl solution was rather noble than in the artificial saliva and human saliva, and that arising point of an anodic polarization curve shifted into higher potential side in human saliva. In all soultions examined, AgCl precipitated on the surface of the specimen.
Surface appearance and Dissolution After dental Ag-Pd-Cu-Au alloy and dental base alloys were immersed in the 1% NaCl solution, human saliva and calf serum, they were observed electromicroscopixally and metal ion releases were measured. It was found that in the human saliva and calf serum, HAP precipitated on the surface of the specimen and that in the human saliva, structural features of the alloy affected Cu release.
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