Dental alloys for porcelain-fused-to-metal restorations

Details Dental alloys for porcelain-fused-to-metal restorations Dental alloys for porcelain-fused-to-metal restorations

C - Chemistry, Metallurgy

22

C

75/14

C22C 5/04 (2006.01) A61K 6/04 (2006.01)

Patent

CA 1210617

ABSTRACT OF THE DISCLOSURE A dental alloy for use in porcelain-fused-to- metal restorations including palladium, cobalt, gallium, gold, aluminum, copper and ruthenium or rhenium. The cobalt controls the coefficient of thermal expansion of the alloy to permit the use of the alloy with commercially available porcelains having a variety of thermal coefficients. The ru- thenium or rhenium provides grain refining for the alloy to increase its elongation, tensile strength, and thus toughness. The alloy with ruthenium or rhenium as a grain refining agent must be made under vacuum or in an inert atmosphere to avoid the for- mation of bubbles in the porcelain during the por- celain firing process. -19-

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