US3620778A — Method of making dental impression and dental sto…

Claim 1

Independent Claim 230 words

In processes for producing dental compositions for use in making dental impressions and for casts and models by preparing dental compositions containing calcium sulfate and an alginate dispersed in water as essential active ingredients and which contains in addition dispersed in said water a substantially water insoluble inert inorganic filler, said composition having the property of setting up after being formed, the improvement which consists of dispersing in said dental compositions a polymeric organic substance in the form of an aqueous suspension of the same and of the class having elastomeric and plastic properties is selected from the group of alkyd polyester and cellulosic plastics consisting essentially of a phthalic acid-glycerol-linoleic acid condensate, a maleic anhydride (adduct)-glycerol-linoleic acid condensate, cellulose acetate, cellulose acetate butyrate, and cellulose acetate propionate, and from the group of fluorocarbons and silicones consisting essentially of polytetrafluoroethylene, copolymer of polytetrafluoroethylene with hexafluoropropylene, and a viscous polydimethylsiloxane, which are added to the said dental compositions in the form of an aqueous suspension of the same in amounts sUfficient to produce about 0.5 to about 5.0 percent by weight of said polymeric organic substance based on the combined weight of the dry material and the water in said composition, and which have the property of improving the surfaces of the impressions and casts and models made therefrom and rendering the latter more precise with smoother and substantially nonchalky surfaces.

Claim 2

Dependent Claim 173 words

In processes for producing dental compositions for use in making dental impressions and for casts and models by preparing dental compositions containing calcium sulfate and an alginate dispersed in water as essential active ingredients and which contains in addition dispersed in said water a substantially water insoluble inert inorganic filler, said composition having the property of setting up after being formed the improvement which consists of dispersing in said dental compositions a polymeric organic substance in the form of an aqueous suspension of the same which consists of a natural rubber latex which is added to the said dental compositions in the form of an aqueous suspension of the same in amounts sufficient to produce about 0.5 to about 5.0 percent by weight of said polymeric organic substance based on the combined weight of the dry material and the water to be added, and which have the property of improving the surfaces of the impressions and casts and models made therefrom and rendering the latter more precise with smoother and substantially nonchalky surfaces.

Claim 3

Dependent Claim 201 words

In processes for producing dental compositions for use in making dental impressions and for casts and models by preparing dental compositions containing calcium sulfate and an alginate dispersed in water as essential active ingredients and which contains in addition dispersed in said water a substantially water insoluble inert inorganic filler, said composition having the property of setting up after being formed, the improvement which consists of dispersing in said dental compositions an organic substance in the form of an aqueous suspension of the same which consists of a wax having plastic properties selected from the group consisting of paraffin wax, candallila wax, carnauba wax, bayberry wax, beeswax, spermaceti, Chinese and Japan wax, and semisolid to solid high molecular weight synthetic waxes, which are added to the said dental compositions in the form of an aqueous suspension of the same in amounts sufficient to produce about 0.5 to about 5.0 percent by weight of said organic substance based on the combined weight of the dry material and the water in said composition, and which have the property of improving the surfaces of the impressions and casts and models made therefrom and rendering the latter more precise with smoother and substantially nonchalky surfaces.

Claim 4

Dependent Claim 21 words

The process for producing a composition defined in claim 15 wherein the finely divided suspension of organic substance consists of polyvinylacetate.

Claim 5

Dependent Claim 197 words

In processes for producing dental compositions for use in making dental impressions and for casts and models by preparing dental compositions containing calcium sulfate and an alginate dispersed in water as essential active ingredients and which contains in addition dispersed in said water a substantially water insoluble inert inorganic filler, said composition having the property of setting up after being formed, the improvement which consists of dispersing in said dental compositions a polymeric organic substance in the form of an aqueous suspension of the same and of the class having elastomeric and plastic properties selected from the group of substances having plastic properties consisting essentially of a polyacrylic ester, a polymethacrylic ester and copolymer vinylchlorideacrylic ester, which are added to the said dental compositions in the form of an aqueous suspension of the same in amounts sufficient to produce about 0.5 to about 5.0 percent by weight of said polymeric organic substance based on the combined weight of the dry material and the water in said composition, and which have the property of improving the surfaces of the impressions and casts and models made therefrom and rendering the latter more precise with smoother and substantially nonchalky surfaces.

Claim 6

Dependent Claim 223 words

In processes for producing dental stone compositions for use in making casts and models from dental impressions by preparing dental compositions containing calcium sulfate dispersed in water as an essential ingredient and having the property of setting up after being formed, the improvement which consists of dispersing in said dental compositions of polymeric organic substance in the form of an aqueous suspension of the same and of the class having elastomeric and plastic properties selected from the group of elastomers consisting essentially of polyisoprene, polyacrylonitrile copolymer of styrene-butadiene, copolymer of butadiene-acrylonitrile, polybutadiene, polyethylene, and polyisobutylene, and from the group of plastic substances consisting essentially of polyvinyl acetate, polyvinylchloride, copolymer vinylacetate-vinylchloride, copolymer vinylchloride-vinylidene chloride, polyvinylidene chloride and polyvinyl butyral, which are added to the said dental compositions in the form of a suspension of the same in an aqueous medium in amounts sufficient to produce about 0.5 to about 5.0 percent by weight of said polymeric organic substance based on the combined weight of the dry material and the water in said composition and which have the property of improving the surfaces of the casts and models made therefrom and rendering the latter more precise with smoother and substantially nonchalky surfaces, and said dental compositions being further characterized by the said calcium sulphate being present in amounts of about 72 to about 80 percent.

Claim 7

Dependent Claim 233 words

In processes for producing dental stone compositions for use in making casts and models from dental impressions by preparing dental compositions containing calcium sulfate dispersed in water as an essential ingredient and having the property of setting up after being formed, the improvement which consists of dispersing in said dental compositions a polymeric organic substance in the form of an aqueous suspension of the same and of the class having elastomeric and plastic properties selected from the group of alkyd polyester and cellulosic plastics consisting essentially of a phthalic acid-glycerol-linoleic acid condensate, a maleic anhydride (adduct)-glycerol-linoleic acid condensate, cellulose acetate, cellulose acetate butyrate, and cellulose acetate propionate, and from the group of fluorocarbons and silicones consisting essentially of polytetrafluoroethylene, copolymer of polytetrafluoroethylene with hexafluoropropylene, and a viscous polydimethylsiloxane which are added to the said dental compositions in the form of a suspension of the same in an aqueous medium in amounts sufficient to produce about 0.5 to about 5.0 percent by weight of said polymeric organic substance based on the combined weight of the dry material and the water in said composition and which have the property of improving the surfaces of the casts and models made therefrom and rendering the latter more precise with smoother and substantially nonchalky surfaces, the said dental compositions being further characterized by the said calcium sulfate being present in amounts of about 72 to about 80 percent.

Claim 8

Dependent Claim 177 words

In processes for producing dental stone compositions for use in making casts and models from dental impression by preparing dental compositions containing calcium sulfate dispersed in water as an essential ingredient and having the property of setting up after being formed, the improvement which consists of dispersing in said dental compositions of polymeric organic substance in the form of an aqueous suspension of the same which consists of a natural rubber latex which is added to the said dental compositions in the form of a suspension of the same in an aqueous medium in amounts sUfficient to produce about 0.5 to about 5.0 percent by weight of said polymeric organic substance based on the combined weight of the dry material and the water in said composition and which have the property of improving the surfaces of the casts and models made therefrom and rendering the latter more precise with smoother and substantially nonchalky surfaces, the said dental compositions being further characterized by the said calcium sulfate being present in amounts of about 72 to about 80 percent.

Claim 9

Dependent Claim 205 words

In processes for producing dental stone compositions for use in making casts and models from dental impressions by preparing dental compositions containing calcium sulfate dispersed in water as an essential ingredient and having the property of setting up after being formed, the improvement which consists of dispersing in said dental compositions an organic substance in the form of an aqueous suspension of the same which consists of a wax having plastic properties selected from the group consisting of paraffin wax, candallila wax, carnauba wax, bayberry wax, beeswax spermaceti, Chinese and Japan waxes, and semisolid to solid high molecular weight synthetic waxes, which are added to the said dental compositions in the form of a suspension of the same in an aqueous medium in amounts sufficient to produce about 0.5 to about 5.0 percent by weight of said organic substance based on the combined weight of the dry material and the water on said composition and which have the property of improving the surfaces of the casts and models made therefrom and rendering the latter more precise with smoother and substantially, nonchalky surfaces, the said dental compositions being further characterized by the said calcium sulfate being present in amounts of about 72 to about 80 percent.

Claim 10

Dependent Claim 21 words

The process for producing a composition defined in claim 7 wherein the finely divided suspension of organic substances consists of polyvinylacetate.

Claim 11

Dependent Claim 203 words

In processes for producing dental stone compositions for use in making casts and models from dental impressions by preparing dental compositions containing calcium sulfate dispersed in water as an essential ingredient and having the property of setting up after being formed, the improvement which consists of dispersing in said dental compositions a polymeric organic substance in the form of an aqueous suspension of the same and of the class having elastomeric and plastic properties is selected from the group of substances having plastic properties consisting essentially of a polyacrylic ester, a polymethacrylic ester and copolymer vinylchloride acrylic ester which are added to the said dental compositions in the form of a suspension of the same in an aqueous medium in amounts sufficient to produce about 0.5 to about 5.0 percent by weight of said polymeric organic substance based on the combined weight of the dry material and the water in said composition and which have the property of improving the surfaces of the casts and models made therefrom and rendering the latter more precise with smoother and substantially nonchalky surfaces, the said dental compositions being further characterized by the said calcium sulfate being present in amounts of about 72 to about 80 percent.

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	1974-11-15	1975-05-17	1975-11-16	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	1978-11-15	1979-05-17	1979-11-16	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	1982-11-15	1983-05-17	1983-11-16	$7700.00	Window Closed / Lapsed

Method of making dental impression and dental stones having smooth surfaces

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