C - Chemistry – Metallurgy – 22 – C
Patent
C - Chemistry, Metallurgy
22
C
75/1, 6/36
C22C 5/06 (2006.01) A61K 6/05 (2006.01)
Patent
CA 1068129
ABSTRACT OF THE DISCLOSURE An improved composition is adapted for amalgamation with mercury to form a dental amalgam and comprises a substantially uniform blend of a major proportion by weight (preferably 55 to 90% by weight) of a first alloy and a minor proportion by weight (preferably 10 to 45% by weight) of a second alloy. The first alloy is in the form of spheroidal particles having a particle size distribution in the range of about 1 to about 100 microns and consists essentially of about 47% to 70% by weight silver, about 20% to 32% by weight tin, and about 7% to 27% by weight copper. Each of the spheroidal particles of the first alloy has a gradient composition from the surface to the center thereof. The second alloy is 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 40% to 70% by weight silver, about 10% to 30% by weight tin, and about 20% to 40% by weight copper.
267699
Alcuri Louis F.
Aliotta Joseph
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