Corrosion-resistant dental alloy
AssigneeEngelhard Minerals & Chemicals Corporation
InventorsJoseph Aliotta, Louis F. Alcuri, Jr.
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Abstract
A corrosion-resistant dental alloy is disclosed which has improved handling characteristics during the filling of a dental cavity. The alloy is a substantially uniform blend of two types of particles having the same chemical components, but differing in morphology and, optionally, in proportions of components. One type of particle is spherical or spheroidal in form and the second type of particle is a randomly-shaped microcrystalline form. Handling characteristics of an amalgam prepared from such alloys can be adjusted to suit the requirements of the user by varying the relative proportions of the two types of particles while still retaining the corrosion resistance of the particles.
Claims13
A corrosion-resistant dental alloy mixture for use as a filling for dental cavities after amalgamation with mercury consisting essentially of a substantially uniform mixture of particles of a first dental alloy and a second dental alloy, both of said dental alloys comprising a mixture of silver, tin and copper, said first alloy comprising spherical particles having a mean particle size of from about 20 to 26.5 microns, and further having a particle size distribution such that substantially all of said particles fall within a particle size range of from about 1 to 75 microns, said particles having a surface area of about 0.21 m.sup.2 /gm, and said second alloy comprising particles having a mean particle size of between about 20 and 26.5 microns, and further having a particle size distribution such that substantially all said particles fall within a particle size range of from about 1 to 75 microns, said particles having a surface area of from about 0.23 m.sup.2 /gm to 0.26 m.sup.2 /gm.
A corrosion-resistant dental alloy mixture for use as a filling for dental cavities after amalgamation with mercury consisting essentially of a substantially uniform mixture of particles of a first dental alloy and a second dental alloy, both of said alloys comprising a mixture of silver, tin and copper, said first dental alloy comprising spherical particles having a mean particle size of between about 20 and 26.5 microns, and further having a particle size distribution such that substantially all of said particles fall within the particle size range of from about 1 to 75 microns, said spherical particles having a surface area of about 0.21 m.sup.2 /gm, and said second alloy comprising randomly shaped particles having a surface area at least about 20 percent greater than the surface area of said spherical particles but less than 0.33 m.sup.2 /gm, said randomly shaped particle having approximately the same particle size distribution as said spherical particles.
Dependencies are inferred from the claim text.