Dental amalgams
AssigneeEngelhard Minerals & Chemicals Corporation
InventorsJoseph Aliotta, Louis F. Alcuri
Life of this patent
Estimating the term…
Abstract
An improved dental composition comprises an admixture in specified proportions of two powdered alloys of specified composition, one in the form of spheres, the other in the form of irregularly-shaped particles such as flakes. When the admixture is amalgamated with mercury, a corrosion-resistant dental amalgam having enhanced mechanical properties and handling characteristics is produced.
Claims7
A composition adapted for amalgamation with mercury to form a dental amalgam comprising a substantially uniform blend of:
- a. a major proportion by weight of a first alloy in the form of spheroidal particles having a particle size distribution in the range of about 1 to about 100 microns and consisting essentially of about 40% to 70% by weight silver, about 10% to 30% by weight tin, and about 20% to 40% by weight copper;
- and
- b. a minor proportion by weight of a second alloy in the form of irregularly-shaped particles having a particle size distribution in the range of about 1 to 100 microns and consisting essentially of about 55% to 75% by weight silver, about 20% to 40% by weight tin, about 0.05% to 10% by weight copper and about 0.1% to 2% by weight zinc.
A composition adapted for amalgamation with mercury to form a dental amalgam comprising a substantially uniform blend of:
- a. about 70% to about 80% by weight of a first alloy in the form of spheroidal particles having a particle size distribution in the range of about 2 to about 80 microns and consisting essentially of about 40% to 70% by weight silver, about 10% to 30% by weight tin, and about 20% to 40% by weight copper;
- and
- b. about 20% to about 30% by weight of a second alloy in the form of irregularly-shaped particles having a particle size distribution in the range of about 2 to 80 microns and consisting essentially of about 55% to 75% by weight silver, about 20% to 40% by weight tin, about 0.05% to 10% by weight copper, and about 0.1% to 2% by weight zinc.
Dependencies are inferred from the claim text.