C - Chemistry – Metallurgy – 22 – C
Patent
C - Chemistry, Metallurgy
22
C
75/114, 83/25, 6
C22C 19/05 (2006.01) A61K 6/04 (2006.01)
Patent
CA 1151446
ABSTRACT OF THE DISCLOSURE The instant invention relates to dental constructions such as bridges, crowns and the like which utilize a novel dental alloy as a metal core and porcelain or other tooth simulating material bonded thereto. The instant dental alloys are composed primarily of nickel, and chromium and contain on a weight percent basis, about 65 to 80% nickel, about 12.0 to 20.0% chromium, and in addition, about 3.5 to 5.0% silicon, about 3.0 to 6.0% molybdenum, and about 0.2 to 0.6% boron. More preferably the alloys consist essentially of 71 to 74.3% nickel, 17.5 to 19.5% chromium, 3.9 to 4.5% silicon, about 3.9 to 4.5% molybdenum and 0.3 to 0.5% boron. The alloys have excellent physical properties for dental applications having a fusion temperature with the range of about 2300 to 2450°F, a coefficient of expansion of from about 13.6 x 10-6 in/in/°C to about 14.5 x 10-6 in/in/°C, good corrosion resistance when compared with similarly cast gold or other commercial non-precious metal alloys and good oxidation resistance. They also have as cast, a tensile strength of at least 80,000 p.s.i., an elongation of about 2.0 to 5.0%, a Rockwell B hardness within the range of about 90 to 100, and good bonding to porcelain.
324506
Johnson & Johnson
Swabey Ogilvy Renault
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