Dental constructions and dental alloys

Details Dental constructions and dental alloys Dental constructions and dental alloys

1977-02-24

1978-12-19

Peshock, Robert

A61C 1300

Patent

active

041299442

ABSTRACT:
The invention relates to dental constructions such as bridges, crowns and the like comprising a metal core and porcelain or other tooth simulating material bonded thereto, and to dental alloys having good physical strength, corrosion resistance, workability and ability to bond to porcelain. The dental alloys have a base cost 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.
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 percent nickel, about 15 to 23.5 percent chromium and about 3.5 to 6 percent silicon, to which a small amount of molybdenum and boron are added. The molybdenum is present within the range of 3 to 5 percent and boron within the range of 0.2 to 2 percent 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 13.0 .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 psi, an elongation of about 0.5 to 5.0 percent, a Rockwell C hardness within the range of about 25 to 33, and good bonding to porcelain.

REFERENCES:
patent: 2190840 (1940-02-01), Kay
patent: 2864696 (1958-12-01), Foreman
patent: 2897595 (1959-08-01), Lee
patent: 2936229 (1960-05-01), Shepard
patent: 3834024 (1974-09-01), Kochavi
patent: 3896547 (1975-07-01), Kulwiec

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