Dental restorations using castings of non-precious metals

Details Dental restorations using castings of non-precious metals Dental restorations using castings of non-precious metals

1978-11-20

1980-07-01

Rutledge, L. Dewayne

Specialized metallurgical processes, compositions for use therei

Processes

Free metal or alloy reductant contains magnesium

427 2, 433207, C22C 1905

Patent

active

042104475

ABSTRACT:
A method and material for making dental restorations by using a porcelain-covered body of a non-precious metal alloy. The alloy preferably includes about 58-68% nickel, 18-23% chromium, 6-10% molybdenum, up to 5% of at least one rare-earth element, up to 4% columbium plus tantalum, up to 2% iron, and lesser quantities of carbon, aluminum, titanium, silicon and manganese. The alloy is resistant to corrosion by mouth fluids, is easy to finish and polish, and is closely matched to the thermal-expansion properties of commercially available dental porcelains. The alloy does not contaminate alloy-melting crucibles, exhibits excellent bonding characteristics to dental porcelains, is easy to melt and cast, and has sufficient ductility to enable margin burnishing of dental-restoration castings of the alloy.

REFERENCES:
patent: 3160500 (1964-12-01), Eiselstein et al.
patent: 3716418 (1973-02-01), Kochavi
patent: 3761728 (1973-09-01), Kochavi
patent: 3841868 (1974-10-01), Dudek et al.
patent: 3843359 (1974-10-01), Fiene et al.
patent: 3914867 (1975-10-01), Manning et al.
patent: 4053308 (1977-10-01), Tesk et al.
patent: 4118223 (1978-10-01), Acuncius et al.
Moon et al, "The Burnishability of Dental . . . Alloys" J. Prosthet. Dent, Oct. 1976, vol. 36, p. 404.

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