Grain-refined gold-free dental alloys for porcelain-fused-to-met

Details Grain-refined gold-free dental alloys for porcelain-fused-to-met Grain-refined gold-free dental alloys for porcelain-fused-to-met

1984-12-26

1986-03-18

Skiff, Peter K.

Alloys or metallic compositions

Palladium base

Copper containing

420463, 433207, 4332221, C22C 504

Patent

active

045767890

ABSTRACT:
Grain refined palladium-based dental alloys contain about 70-85 weight percent palladium, 7-15 weight percent copper, 2-8 weight percent gallium, 2-15 weight percent indium, 0.2-3.0 weight percent rhenium or ruthenium and an effective amount of boron up to about 0.15% which eliminates the formation of bubbles in porcelain during the porcelain firing process. In addition, there can be an effective amount of zinc up to about 0.5 weight percent. Alternately, in lieu of zinc, the boron is added in the form of calcium boride.

REFERENCES:
patent: 4201577 (1980-05-01), Ingersoll et al.
patent: 4387072 (1983-06-01), Schaffer
patent: 4451639 (1984-05-01), Prasad

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