DETAILED DESCRIPTION What is claimed is: 1.
A copper free dental gold alloy consisting essentially of 25 to 40% silver, 40 to 60% gold, 5 to 20% palladium, 0.
05 to 0.
5% iridium, 0 to 6% indium 0 to 6% tin and 0 to 2% zinc, with the proviso that the named non-noble metals are present in a total amount of at least 2%.
2.
The alloy of claim 1 consisting essentially of 28 to 35% silver, 50 to 58% gold, 5 to 10% palladium, 0.
05 to 0.
15% iridium, 2 to 5% indium, 0 to 3% tin and 0 to 1% zinc, with the proviso that the named non-noble metals are present in a total amount of at least 4%.
3.
The alloy of claim 1 consisting essentially of 35.
0% Ag, 55.
0% Au, 5.
0% In, 0.
1% Ir, and 4.
9% Pd.
4.
The alloy of claim 1 consisting essentially of 30.
0% Ag, 58.
0% Au, 3.
0% In, 0.
1% Ir, 6.
4% Pd, 2.
0% Sn and 0.
5% Zn.
5.
The alloy of claim 1 consisting essentially of 29.
5% Ag, 58.
0% Au, 3.
0% In, 0.
1% Ir, 6.
4% Pd, 2.
0% Sn and 1.
0% Zn.
6.
The alloy of claim 1 consisting essentially of 30.
5% Ag, 55.
0% Au, 3.
0% In, 0.
1% Ir, 8.
4% Pd, 2.
0% Sn and 1.
0% Zn.
7.
The alloy of claim 1 consisting essentially of 30.
0% Ag, 55% Au, 2.
5% In, 0.
1% Ir, 9.
9% Pd and 2.
5% Sn.
8.
The alloy of claim 1 consisting essentially of 29.
0% Ag, 55.
0% Au, 4.
0% In, 0.
1% Ir, 9.
9% Pd, 1.
0% Sn and 1.
0% Zn.
9.
The alloy of claim 1 consisting essentially of 28.
0% Ag, 55.
0% Au, 5.
0% In, 0.
1% Ir, 9.
9% Pd, 1.
0% Sn and 1.
0% Zn.
Description:
The invention is directed to a copper free dental gold alloy based on silver-gold-palladium containing a relatively low gold content.
For dental purposes, for example for the production of crowns and bridges, there have been used gold alloys for a long period of time.
Such alloys originally were formed only of gold, silver and copper.
Beginning at about the start of the 20th century there were developed alloys in which a part of the gold was first replaced by platinum and later also by other metals of the platinum group, especially palladium.
Alloys of this type with various physical properties are listed for example in the "Specification No
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Metal Working 
