Title: Noble metal alloy for dentistry and dental restoration using same

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Abstract: A noble metal alloy having a solidus temperature above 1100.degree. C., a Vickers hardness of at least 150 and a coefficient of thermal expansion at 600.degree. C. of at least 0.8 percent consists essentially of 45-60 percent gold, 30-50 percent palladium and 2-7 percent tin. The alloy includes 3 to 10 percent of zinc, and mixtures thereof with indium, and up to 2 percent of rhenium, nickel, platinum and mixtures thereof. The tin to palladium ratio is 5-15:100 and the gold, palladium and platinum content must not exceed 95 percent of the composition. This alloy provides a desirable casting upon which may be fired a porcelain coating to provide a desirable dental restoration from the standpoints of hardness, inertness and aesthetics.


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