Thermoplastic dental filling composition
AssigneeG-C Dental Industrial Corp.
InventorsShunichi Futami, Satoshi Terauchi
Life of this patent
Estimating the term…
Abstract
A thermoplastic dental filling composition is disclosed, comprising a polymer component containing trans-1,4-polyisoprene and an ethylene/vinyl acetate copolymer resin and an insoluble or sparingly soluble inorganic filler. The filling composition of the invention has similar softening operation properties to natural guttapercha and has a high tensile strength and, therefore, it can be suitably used as a root canal filling material. Further, a composition comprising the above-described dental filling composition having a wax-like component added thereto is used as a temporary filling material.
Claims21
A thermoplastic dental filling composition comprising from 3 to 50% by weight of a polymer component comprising trans-1,4-polyisoprene and an ethylene/vinyl acetate copolymer resin, said copolymer resin comprising from 15 to 40 wt. % vinyl acetate and having a melt index substantially from 10 to 400, and from 50 to 97% by weight of an insoluble or sparingly soluble inorganic filler, said filler having a solubility of 0.5 g or less in 100 ml water at 20.degree. C.
A thermosplastic dental filling composition comprising from 3 to 50% by weight of an organic component comprising (a) a polymer component comprising trans-1,4-polyisoprene and an ethylene/vinyl acetate copolymer resin, said copolymer resin comprising from 15 to 40 wt. % vinyl acetate and having a melt index substantially from 10 to 400, and (b) at least one thermoplastic resin selected from the group consisting of polystyrene, a styrene-based copolymer resin, low molecular weight polyethylene, low molecular weight polypropylene, an olefin-based resin, a rosin-based resin, a terpene-based resin, an alicyclic saturated hydrocarbon resin, and a coumarone resin;
- and from 50 to 97% by weight of an insoluble or sparingly soluble inorganic filler, said filler having a solubility of 0.5 g or less in 100 ml water at 20.degree. C.
A thermoplastic dental filling composition comprising from 3 to 50% by weight of an organic component comprising (a) a polymer component comprising trans-1,4-polyisoprene and an ethylene/vinyl acetate copolymer resin, said copolymer resin comprising from 15 to 40 wt. % vinyl acetate and having a melt index substantially from 10 to 400, and (b) at least one wax-like component having a melting point of 70.degree. C. or less, selected from the group consisting of a natural wax, a synthetic wax, a higher fatty acid, and a higher alcohol;
- and from 50 to 97% by weight of an insoluble or sparingly soluble inorganic filler, said filler having a solubility of 0.5 g or less in 100 ml water at 20.degree. C.
A thermoplastic dental filling composition comprising from 3 to 50% by weight of an organic component comprising (a) a polymer component comprising trans-1,4-polyisoprene and an ethylene/vinyl acetate copolymer resin, said copolymer resin comprising from 15 to 40 wt. % vinyl acetate and having a melt index substantially from 10 to 400, (b) at least one thermoplastic resin selected from the group consisting of polystyrene, a styrene-based copolymer resin, low molecular weight polyethylene, low molecular weight polypropylene, an olefin-based resin, a rosin-based resin, a terpene-based resin, an alicyclic saturated hydrocarbon resin, and a coumarone resin, and (c) at least one wax-like component having a melting point of 70.degree. C. or less, selected from the group consisting of a natural wax, a synthetic wax, a higher fatty acid, and a higher alcohol;
- and from 50 to 97% by weight of an insoluble or sparingly souble inorganic filler, said filler having a solubility of 0.5 g or less in 100 ml water at 20.degree. C.
Dependencies are inferred from the claim text.