| Project/Area Number |
14571856
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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 | Health Sciences University of Hokkaido |
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Principal Investigator |
ENDO Kazuhiko Health Sciences University of Hokkaido, School of Dentistry, Associate Professor, 歯学部, 助教授 (70168821)
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| Co-Investigator(Kenkyū-buntansha) |
OHNO Hiroki Health Sciences University of Hokkaido, School of Dentistry, Professor, 歯学部, 教授 (70018430)
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| Project Period (FY) |
2002 – 2004
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| Project Status |
Completed (Fiscal Year 2004)
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| Budget Amount *help |
¥2,900,000 (Direct Cost: ¥2,900,000)
Fiscal Year 2004: ¥500,000 (Direct Cost: ¥500,000)
Fiscal Year 2003: ¥600,000 (Direct Cost: ¥600,000)
Fiscal Year 2002: ¥1,800,000 (Direct Cost: ¥1,800,000)
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| Keywords | Ag-based alloy / Corrosion resistance / Tarnish resistance / Palladium / 貴金属合金 / パラジウム / 銀合金 / 耐変色性 / X線回析 / 腐食速度 / アノード / Ag-In-Au合金 / 交流インピーダンス法 / 原子吸光法 / X線光電子分光法 / 歯科鋳造用Ag合金 / 分極曲線 |
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| Research Abstract |
The corrosion behaviors of twenty five experimental Ag-Pd-Cu-Au alloys and five Ag-In-Au alloys were examined in 0.9% NaCl and 0.1% Na_2S solutions to develop a high corrosion resistant dental casting alloy with low Pd content. The corrosion resistance was evaluated by electrochemical techniques and the analysis of released metal ions by atomic absorption spectrophotometry. The surface of the alloy was analyzed by X-ray photoelectron spectroscopy (XPS).
It was found that the 15 mass % of Pd was required for the Ag-Pd-Cu-Au alloys to maintain sufficient corrosion resistance in simulated oral environments. The Ag-15Pd-15Au-(10-20)Cu alloys can be alternatives to the Ag-20Pd-(10-20)Cu-12Au alloy that is currently used for inlays, crowns and bridges.
For Ag-In-Au alloy system, small amount of Au (1-3 mass%) drastically improve corrosion resistance of the Ag-20In alloy both in 0.9% NaCl solution and 0.1% Na_2S solution. The Ag-20In-(1-3)Au alloy is can be used as a Pd-free dental casting alloy that possesses high corrosion resistance. These alloys are suitable for inlays and crowns.
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