Cobalt-chromium dental alloys containing ruthenium and aluminum

Details Cobalt-chromium dental alloys containing ruthenium and aluminum Cobalt-chromium dental alloys containing ruthenium and aluminum

C - Chemistry, Metallurgy

22

C

75/16

C22C 19/07 (2006.01) A61K 6/04 (2006.01)

Patent

CA 1193114

ABSTRACT OF THE DISCLOSURE A cobalt-chromium dental alloy for use in por- celain-fused-to-metal restorations consisting essential- ly of about: Element Weight Percent Cobalt 40-60 Chromium 20-30 Ruthenium 5-15 Aluminum 1-4 Yttrium 0-0.15 Tungsten 0-15 Molybdenum 0-6.5 Niobium 0-3.0 Zirconium 0-0.25 Manganese 0-1.5 wherein the sum of the constituents equals 100% and the sum of the tungsten and molybdenum constituents minus the sum of the ruthenium, niobium and zirconium constituents is less than about 5%. These alloys exhibit outstanding physical and chemical properties, including the formation of a tenacious bond with porcelain without the need for a separate bonding agent, and can be used advantageously as a substitute for alloys having a high proportion of precious metals as well as for nickel-chromium-based al- loys in the fabrication of porcelain-veneered fixed bridgework and crowns.

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