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Gallium and silver free, palladium based dental alloys for porcelain-fused-to-metal restorations
| Details |
Inventors: Prasad, Arun;
Assignee: Jeneric Industries, Inc. (Wallingford, CT)
Primary Examiner:
Assistant Examiner:
Attorney, Agent or Firm:
A dental alloy for porcelain-fused-to-metal restorations is provided which consists essentially of, on a weight basis, about 60-90% palladium, an effective amount of ruthenium up to about 2% for the purpose of grain-refining the alloy, an effective amount of copper up to about 30% for the purpose of lowering the melting point and raising the thermal expansion, up to about 15% indium, up to about 16% tin, up to about 12% zinc, up to about 5% gold, and from about 0.05 to about 0.25% boron or calcium boride, the total of said constituents being 100%, wherein the sum of the copper, indium, tin and zinc concentrations is greater than about 18%, the sum of the indium, tin and zinc concentrations is greater than about 10%, and the sum of the indium and zinc concentrations is greater than about 5%, such that said alloy exhibits a melting point between about 1100.degree. C. and 1400.degree. C. and a coefficient of thermal expansion of about 0.66 to 0.72 at 500.degree. C. To ensure essentially bubble-free restorations, the alloy is preferably made in a ceramic, rather than a carbon-containing, crucible and in a protective environment. |
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DETAILED DESCRIPTION I claim: 1.
A dental alloy for porcelain-fused-to-metal restorations consisting essentially of, on a weight basis, about 60-90% palladium, an effective amount of ruthenium up to about 2% for the purpose of grain-refining the alloy, an effective amount of copper up to about 30% for the purpose of lowering the melting point and raising the thermal expansion, up to about 15% indium, up to about 16% tin, up to about 12% zinc, up to about 5% gold, and from about 0.
05 to about 0.
25% boron or calcium boride, the total of the named constituents being 100%, wherein the sum of the copper, indium, tin and zinc concentrations is greater than about 18%, the sum of the indium, tin and zinc concentrations is greater than about 10%, and the sum of the indium and zinc concentrations is greater than about 5%, such that said alloy exhibits a melting point between about 1100.
degree.
C.
and 1400.
degree.
C.
and a coefficient of thermal expansion of about 0.
66 to 0.
72 at 500.
degree.
C.
2.
The alloy of claim 1 wherein the palladium concentration is between about 65 and 75%, the copper concentration is between about 8 and 16%, the indium concentration is between about 3.
5 and 6%, the tin concentration is between about 2 and 6%, the ruthenium concentration is between about 0.
5 and 1.
0%, the zinc concentration is between about 2 and 5.
5%, the gold concentration is between about 0.
5 and 3.
0%, and the boron concentration is between about 0.
05 and 0.
15%.
3.
The alloy of claim 2 wherein the palladium concentration is about 70.
625%, the copper concentration is about 14.
5%, the indium concentration is about 4%, the tin concentration is about 4%, the ruthenium concentration is about 1.
0%, the zinc concentration is about 3.
75%, the gold concentration is about 2%, and the boron concentration is about 0.
125%.
4.
The alloy of claim 1 wherein the palladium concentration is between about 65 and 75%, the copper concentration is between about 8 and 16%, the indium concentration is between about 3.
5 and 6%, the tin concentration is between about 2 and 6%, the ruthenium concentration is between about 0
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Metal Working 
