| 摘要 |
A cobalt-chromium dental alloy for use in porcelain-fused-to-metal restorations consisting essentially 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 equal 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 alloys in the fabrication of porcelain-veneered fixed bridgework and crowns.
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