Noble metal alloy for dentistry and dental restoration using sam

Details Noble metal alloy for dentistry and dental restoration using sam Noble metal alloy for dentistry and dental restoration using sam

1978-10-25

1980-06-03

Rutledge, L. Dewayne

Specialized metallurgical processes, compositions for use therei

Processes

Free metal or alloy reductant contains magnesium

75165, 75172G, C22C 500

Patent

active

042059828

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.

REFERENCES:
patent: B483256 (1976-02-01), Tuccillo
patent: 3716356 (1973-02-01), Burnett
patent: 4123262 (1978-10-01), Cascone

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