Gold alloys for fusion to porcelain

Details Gold alloys for fusion to porcelain Gold alloys for fusion to porcelain

1978-10-20

1980-03-25

Rutledge, L. Dewayne

Specialized metallurgical processes, compositions for use therei

Processes

Free metal or alloy reductant contains magnesium

75165, 75172G, C22C 500

Patent

active

041949072

ABSTRACT:
A gold alloy for use in a dental restoration which does not cause discoloration and greening of dental porcelain after being cast and having a porcelain jacket fired thereon. The gold alloy also produces extremely clean castings. The alloy is 30-50% gold, 30-50% palladium, 5-30% silver, 0.01-5% of at least one element from silicon, boron, germanium and mixtures thereof and 0.01-1.0% of ruthenium. Other elements are included for strength.

REFERENCES:
patent: 3413723 (1968-12-01), Wagner et al.
patent: 3472653 (1969-10-01), Short
patent: 3667936 (1972-06-01), Katz
patent: 3804616 (1974-04-01), Goltsov et al.
patent: 3868249 (1975-02-01), Hufford, Jr. et al.
patent: 3961420 (1976-06-01), Tuccillo
patent: 3981723 (1976-09-01), Tuccillo
patent: 4069370 (1978-01-01), Harmsen et al.
Williams, Jr. et al., "Porcelain-to-Metal Alloy Systems," Dental Porcelain: The State of Art-1977, University of Southern California School of Dentistry, Los Angeles, California, pp. 71-77.

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