Patent US3509782A successfully refreshed from Google Patents.
Patent US4740245A successfully refreshed from Google Patents.
US4740245A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Thermoplastic dental filling composition
Assignee: GC Corp
•
Filing: 1986-08-21
•
Granted: 1988-04-26
•
Expires: 2006-08-21
Abstract
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.
Inventors
- 👤 Shunichi Futami
- 👤 Satoshi Terauchi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 13:17
CPC Classifications
C; C08; C08L; C08L9/00; A; A61; A61K; A61K6/00; A61K6/80; A61K6/849; A61K6/853; A61K6/876; A61K6/878; C08K; C08K3/00; C08K3/01; C08K3/013; C08L23/00; C08L23/02; C08L23/04; C08L23/08; C08L23/0846; C08L23/0853; C08L25/00; C08L25/02; C08L25/04; C08L91/00; C08L91/06; C08L93/00; C08L93/04
Claims Analysis
Total Claims: 25
Claim 1
Independent Claim
78 words
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° C.
Claim 2
Dependent Claim
78 words
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° C.
Claim 3
Dependent Claim
40 words
A thermoplastic dental filling composition as claimed in claim 1, wherein the amount of said ethylene/vinyl acetate copolymer resin in said polymer component is from 5 to 100 parts by weight based on 100 parts by weight of said trans-1,4-polyisoprene.
Claim 4
Dependent Claim
51 words
A thermoplastic dental filling composition as claimed in claim 1, wherein said inorganic filler is selected from the group consisting of a silicon compound, an alkaline earth metal sulfate, an alkaline earth metal carbonate, a polyvalent metal silicate, a polyvalent metal oxide, a polyvalent metal hydroxide, a clay mineral, and lithopone.
Claim 5
Dependent Claim
127 words
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° C.
Claim 6
Dependent Claim
127 words
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° C.
Claim 7
Dependent Claim
40 words
A thermoplastic dental filling composition as claimed in claim 4, wherein the amount of said ethylene/vinyl acetate copolymer resin in said polymer component is from 5 to 100 parts by weight based on 100 parts by weight of said trans-1,4-polyisoprene.
Claim 8
Dependent Claim
51 words
A thermoplastic dental filling composition as claimed in claim 4, wherein said inorganic filler is selected from the group consisting of a silicon compound, an alkaline earth metal sulfate, an alkaline earth metal carbonate, a polyvalent metal silicate, a polyvalent metal oxide, a polyvalent metal hydroxide, a clay mineral, and lithopone.
Claim 9
Dependent Claim
24 words
A thermoplastic dental filling composition as claimed in claim 4, wherein said thermoplastic resin has a softening point of from 60° to 110° C.
Claim 10
Dependent Claim
33 words
A thermoplastic dental filling composition as claimed in claim 4, wherein said thermoplastic resin is added in an amount of up to 8% by weight with respect to said thermoplastic dental filling composition.
Claim 11
Dependent Claim
119 words
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° 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° C.
Claim 12
Dependent Claim
119 words
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° 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° C.
Claim 13
Dependent Claim
40 words
A thermoplastic dental filling composition as claimed in claim 9, wherein the amount of said ethylene/vinyl acetate copolymer resin in said polymer component is from 5 to 100 parts by weight based on 100 parts by weight of said trans-1,4-polyisoprene.
Claim 14
Dependent Claim
30 words
A thermoplastic dental filling composition as claimed in claim 9, wherein said inorganic filler has a solubility of 0.5 g or less in 100 ml of water at 20° C.
Claim 15
Dependent Claim
51 words
A thermoplastic dental filling composition as claimed in claim 9, wherein said inorganic filler is selected from the group consisting of a silicon compound, an alkaline earth metal sulfate, an alkaline earth metal carbonate, a polyvalent metal silicate, a polyvalent metal oxide, a polyvalent metal hydroxide, a clay mineral, and lithopone.
Claim 16
Dependent Claim
24 words
A thermoplastic dental filling composition as claimed in claim 9, wherein said wax-like component has a melting point of from 37° to 70° C.
Claim 17
Dependent Claim
33 words
A thermoplastic dental filling composition as claimed in claim 9, wherein said wax-like component is added in an amount of up to 20% by weight with respect to said thermoplastic dental filling composition.
Claim 18
Dependent Claim
162 words
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° 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° C.
Claim 19
Dependent Claim
162 words
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° 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° C.
Claim 20
Dependent Claim
40 words
A thermoplastic dental filling composition as claimed in claim 15, wherein the amount of said ethylene/vinyl acetate copolymer resin in said polymer component is from 5 to 100 parts by weight based on 100 parts by weight of said trans-1,4-polyisoprene.
Claim 21
Dependent Claim
51 words
A thermoplastic dental filling composition as claimed in claim 15, wherein said inorganic filler is selected from the group consisting of a silicon compound, an alkaline earth metal sulfate, as alkaline earth metal carbonate, a polyvalent metal silicate, a polyvalent metal oxide, a polyvalent metal hydroxide, a clay mineral, and lithopone.
Claim 22
Dependent Claim
24 words
A thermoplastic dental filling composition as claimed in claim 15, wherein said thermoplastic resin has a softening point of from 60° to 110° C.
Claim 23
Dependent Claim
33 words
A thermoplastic dental filling composition as claimed in claim 15, wherein said thermoplastic resin is added in an amount of up to 8% by weight with respect to said thermoplastic dental filling composition.
Claim 24
Dependent Claim
24 words
A thermoplastic dental filling composition as claimed in claim 15, wherein said wax-like component has a melting point of from 37° to 70° C.
Claim 25
Dependent Claim
33 words
A thermoplastic dental filling composition as claimed in claim 15, wherein said wax-like component is added in an amount of up to 20% by weight with respect to said thermoplastic dental filling composition.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-04-26 | 1991-10-26 | 1992-04-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-04-26 | 1995-10-26 | 1996-04-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-04-26 | 1999-10-26 | 2000-04-26 | $7700.00 | Window Closed / Lapsed |