C - Chemistry – Metallurgy – 22 – C
Patent
C - Chemistry, Metallurgy
22
C
75/114, 6/36
C22C 19/05 (2006.01) A61K 6/04 (2006.01) A61K 6/06 (2006.01)
Patent
CA 1076398
ABSTRACT OF THE DISCLOSURE The disclosure describes dental alloys composed primarily of nickel, chromium and silicon and containing on a weight percent basis about 65 to 75% nickel, about 15 to 23.5% chromium and about 3.5 to 6% silicon, to which a small amount of molybdenum and boron are added, preferably not more than 7%. These alloys have a fusion temperature within the range of 2050° to 2250°F, a tensile strength of at least 90,000 p.s.i., and a coefficient of expansion in the range of from about 13.5 x 10-6 in/in/°C to 13.8 x 10-6 in/in/°C. As casted, the alloys have a Rockwell C hardness within the range of about 25 to 33, and good bonding to porcelain. These alloys have good physical strength, corrosion resistance, workability and ability to bond porcelain. They have a base of substantially less than gold but are equal to or better than gold for many dental applications. The alloys are also useful in dental applications not requiring bonding to porcelain or plastic as in the preparation of metal inlays or onlays.
244988
Klaus Irving
Lee-You James
Sung Pei
LandOfFree
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