Method for producing semi-finished prosthetic dental preforms

Claim 1

A method for producing semi-finished prosthetic dental preforms consisting essentially of repulverizing a dental porcelain mixture including a suitable binder material which also serves as a plasticizer and lubricant by spray drying such dental porcelain mixture, molding the repulverized dental porcelain mixture in a mold member having a cavity with a form generally complementary to that desired for the molded product, removing the molded product from the mold; and applying an outer coating of incisal or occlusal dental porcelain to selected exterior surfaces of the molded product and heating and baking the molded product until said binder is completely burned out and until the molded product becomes a hard concretious material, said binder comprising between about 14 to 18% by weight of the dental porcelain mixture and including about between 10.5% to 8.5% EVA resin, 5.3% to 3.9% mineral seal oil and about 2.2% to 1.6% stearic acid.

Claim 2

A method for producing semi-finished prosthetic dental preforms consisting essentially of repulverizing a dental porcelain mixture including a suitable binder material which also serves as a plasticizer and lubricant by spray drying such dental porcelain mixture, molding the repulverized dental porcelain mixture in a mold member having a cavity with a form generally complementary to that desired for the molded product, removing the molded product from the mold; and applying an outer coating of incisal or occlusal dental porcelain to selected exterior surfaces of the molded product and heating and baking the molded product until said binder is completely burned out and until the molded product becomes a hard concretious material, said binder comprising between about 14 to 18% by weight of the dental porcelain mixture and including about between 10.5% to 8.5% EVA resin, 5.3% to 3.9% mineral seal oil and about 2.2% to 1.6% stearic acid.

Claim 4

A method for producing semi-finished prosthetic dental preforms consisting essentially of repulverizing occlusal or incisal dental porcelain including a suitable binder material which also serves as a plasticizer and lubricant by spray drying such dental porcelain, molding the repulverized dental porcelain mixture in a mold member having a cavity with a form generally complementary to that desired for the molded product, removing the molded product from the mold, and heating and baking the molded product until said binder is completely burned out and until the molded product becomes a hard concretious material, said binder comprising between about 14 to 18% by weight of the dental porcelain mixture and including about between 10.5% to 8.5% EVA resin, 5.3% to 3.9% mineral seal oil and about 2.2% to 1.6% stearic acid.

Claim 5

A method for producing semi-finished prosthetic dental preforms consisting essentially of repulverizing occlusal or incisal dental porcelain including a suitable binder material which also serves as a plasticizer and lubricant by spray drying such dental porcelain, molding the repulverized dental porcelain mixture in a mold member having a cavity with a form generally complementary to that desired for the molded product, removing the molded product from the mold, and heating and baking the molded product until said binder is completely burned out and until the molded product becomes a hard concretious material, said binder comprising between about 14 to 18% by weight of the dental porcelain mixture and including about between 10.5% to 8.5% EVA resin, 5.3% to 3.9% mineral seal oil and about 2.2% to 1.6% stearic acid.