发明名称 |
Tarnish-resistant gold color alloy and dental restorations employing same |
摘要 |
A tarnish-resistant gold color alloy comprises 30-50 percent by weight gold; 20-50 percent copper; 5-15 percent silver; 2-20 percent zinc; 1.5-15 percent palladium; up to 4.0 percent by weight platinum; and up to 1.0 percent by weight rhenium. The atomic ratio of copper to silver, copper to zinc and copper to palladium are respectively, 6-8:1; 2-12:1; and 5-30:1 and the weight ratios are respectively, 3.5-4.7:1; 3.0-18:1; and 1.95-11.66:1. Dental restorations comprising castings of the alloy have color values on the Hunter scale of L=80-90; a=2.5-3.5; and b=14-18. The dental restorations exhibit tarnish-resistant values of DE1 less than 13 and DE10 less than 20.
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申请公布号 |
US4266973(A) |
申请公布日期 |
1981.05.12 |
申请号 |
US19790103846 |
申请日期 |
1979.12.14 |
申请人 |
THE J. M. NEY COMPANY |
发明人 |
GUZOWSKI, MATTHEW M.;SCHAFFER, STEPHEN P.;WRIGHT, DAVID C. |
分类号 |
A61K6/04;C22C30/02;(IPC1-7):C22C5/02;C22C5/06;C22C5/00 |
主分类号 |
A61K6/04 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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