Dental alloys

Details Dental alloys Dental alloys

1976-09-13

1981-05-19

Dean, R.

Specialized metallurgical processes, compositions for use therei

Processes

Free metal or alloy reductant contains magnesium

C22C 1905

Patent

active

042683084

ABSTRACT:
The metal cores of the dental construction are 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. The molybdenum is present within the range of 3 to 5% and boron within the range of 0.2 to 2% by weight of the total alloy composition. The alloys have excellent physical properties for dental applications having a fusion temperature with the range of about 2050.degree. to 2350.degree. F., a coefficient of expansion of from about 13.6.times.10.sup.-6 in/in/.degree.C. to about 13.8.times.10.sup.-6 in/in/.degree.C., good corrosion resistance when compared with similarly cast gold or other commercial nonprecious metal dental alloys and good oxidation resistance. They also have as casted, a tensile strength of at least 90,000 p.s.i., an elongation of about 0.5 to 5.0%, a Rockwell C hardness within the range of about 25 to 33, and good bonding to porcelain.

REFERENCES:
patent: 2864696 (1958-12-01), Foreman
patent: 2936229 (1960-05-01), Shepard

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