EP0036272A2
Expired / Lapsed
EP
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Permanent dental restorative compositions and methods of using them
Assignee: Rohm and Haas Co
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Filing: 1981-03-05
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Granted: —
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Expires: 2001-03-05
Abstract
Abstract Permanent dental restoration compositions comprise (a) from 25 to 80 parts by weight of liquid monomer system comprising methyl methacrylate and from 15 to 50%, by weight of the system, of at least one polyethylenically unsaturated monomer; (b) from 20 to 75 parts by weight of (1) organic polymeric particulate substance and (2) inorganic particulate substance, (1) and (2) being insoluble in the monomer system, and (c) redox initiator. The compositions may be used to form crowns, bridges or fillings or for dental repair in general. Crowns, for example, may be prepared by mixing a composition comprising (a) and reducing agent with a composition comprising (b) and oxidising agent, filling a mould with the mixture, applying the mould to a tooth stump to set, removing the set crown for polishing and finishing, filling it with cement and applying it to the stump.
Inventors
- 👤 Robert Paul Fellman
- 👤 Robert Marshall Myers
- 👤 Marvin Joseph Hurwitz
- 👤 Gerald Frederick Slack
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-26 09:50
CPC Classifications
A; A61; A61K; A61K6/00; A61K6/80; A61K6/884; A61K6/887
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
92 words
A composition, suitable for preparing permanent dental restorations having high compressive strength and wear resistance, comprising (a) from 25 to 80 parts by weight of a liquid monomer system comprising methyl methacrylate and from 15 to 50% by weight, based on liquid monomer system, of at least one polyethylenically unsaturated crosslinking monomer; (b) from 20 to 75 parts by weight of a mixture of (1) organic polymeric particulate substance insoluble in said liquid monomer system, and (2) inorganic particulate substance insoluble in said liquid monomer system; and (c) a redox initiator system.
Claim 2
Dependent Claim
92 words
A composition, suitable for preparing permanent dental restorations having high compressive strength and wear resistance, comprising (a) from 25 to 80 parts by weight of a liquid monomer system comprising methyl methacrylate and from 15 to 50% by weight, based on liquid monomer system, of at least one polyethylenically unsaturated crosslinking monomer; (b) from 20 to 75 parts by weight of a mixture of (1) organic polymeric particulate substance insoluble in said liquid monomer system, and (2) inorganic particulate substance insoluble in said liquid monomer system; and (c) a redox initiator system.
Claim 3
Dependent Claim
22 words
A composition as claimed in Claim 1 which, when cured, has a compressive strength of at least 0.2068 G Pa (30,000 psi).
Claim 4
Dependent Claim
25 words
A composition as claimed in Claim 1 or 2 which, when cured, has a rotary wear of at least 20 hours/ 25.4 µm (20 hours/mil).
Claim 5
Dependent Claim
40 words
A composition as claimed in any of claims 1 to 3 in the form of two packages, one comprising component (a) and the reducing agent of component (c), the other comprising component (b) and the oxidising agent of component (c).
Claim 6
Dependent Claim
25 words
A composition as claimed in any of claims 1 to 4 containing 30 to 50 parts by weight of said mixture of (1) and (2).
Claim 7
Dependent Claim
26 words
A composition as claimed in any of claims 1 to 5 wherein the particle size of said inorganic particulate substance is from 0.075 to 90 microns.
Claim 8
Dependent Claim
27 words
A composition as claimed in any of claims 1 to 6 wherein the particle size of said organic polymeric particulate substance is from 25 to 75 microns.
Claim 9
Dependent Claim
29 words
A composition as claimed in any of claims 1 to 7 wherein the weight ratio of organic polymeric particulate substance to inorganic particulate substance is from 1:5 to 1:1.
Claim 10
Dependent Claim
30 words
A composition as claimed in any of claims 1 to 8 wherein said organic polymeric particulate substance comprises at least one of poly (ethylene-co-chlorotrifluoroethylene), poly (vinylidene fluoride), nylon, and polyacetal.
Claim 11
Dependent Claim
38 words
A composition as claimed in any of claims 1 to 9 wherein said inorganic particulate substance comprises at least one of hydroxyapatite, calcium carbonate, stearate-coated calcium carbonate, glass beads, quartz, silica, talc, clay, calcium sulfate and glass fiber.
Claim 12
Dependent Claim
28 words
A composition as claimed in any of claims 1 to 10 wherein the polyethylenically unsaturated monomer comprises from 20 to 50% by weight of the liquid monomer system.
Claim 13
Dependent Claim
24 words
A composition as claimed in any of claims 1 to 11 wherein said polyethylenically unsaturated monomer comprises at least one polyfunctional acrylate and/or methacrylate.
Claim 14
Dependent Claim
47 words
A composition as claimed in any of claims 1 to 11 wherein the polyethylenically unsaturated monomer comprises at least one of trimethylolpropane trimethacrylate, ethylene glycol dimethacrylate, 2,2-bis (4- [2-hydroxy-3-methacryloxypropoxy] phenyl) propane, divinylbenzene, diallyl maleate, butylene glycol dimethacrylate, 1,6-hexanediol dimethacrylate, butylene diacrylate, pentaerythritol tetraacrylate, and ethoxylated bis-phenol-A dimethacrylate.
Claim 15
Dependent Claim
35 words
A composition as claimed in any of claims 1 tol3 which further includes up to 10 percent by weight, based on liquid monomer system, of at least one monoethylenically unsaturated monomer other than methyl methacrylate.
Claim 16
Dependent Claim
34 words
A composition as claimed in claim 14 wherein said monoethylenically unsaturated monomer comprises at least one of octafluoropentyl methacrylate, hydroxyethyl methacrylate, hexafluoroisopropyl methacrylate, pentafluoropropyl acrylate, pentafluoropropyl methacrylate, heptafluorobutyl acrylate, heptafluorobutyl methacrylate and butyl methacrylate.
Claim 17
Dependent Claim
33 words
A composition as claimed in any of claims 1 to 15 wherein said redox initiator system comprises a combination of benzoyl peroxide and an aromatic amine or t-butylperoxy maleic acid and calcium hydroxide.
Claim 18
Dependent Claim
38 words
A composition as claimed in any of claims 1 to 16 which further includes one or more of thickener tinting agent, stabilizer to control polymerization rate and exotherm, stabilizer to prevent yellowing, fluorescing agent, and x-ray opacifying agent.
Claim 19
Dependent Claim
23 words
A permanent dental restoration having high compressive strength and wear resistance prepared from a composition according to any of claims 1 to 17.
Claim 20
Independent Claim
50 words
A method of making a permanent dental restoration having high compressive strength and wear resistance, which comprises filling a mould with a composition according to any of claims 1 to 17, allowing the composition to set or setting it and then to curing the composition or allowing it to cure.
Claim 21
Independent Claim
186 words
A method of making permanent dental crowns having high compressive strength and wear resistance which comprises (I) mixing (A) a first component comprising from 25 to 80 parts by weight of a liquid monomer system comprising methyl methacrylate, from 15 to 50% by weight, based on liquid monomer system, of at least one polyethylenically unsaturated crosslinking monomer; and reducing agent; with (B) a second component comprising from 20 to 75 parts by weight of a mixture of (1) organic polymeric particulate substance, and (2) inorganic particulate substance, both of said substances being insoluble in said first component, and oxidizing agent; (II) allowing the resultant mixture to achieve a suitable viscosity, (III) filling a tooth-shaped preformed mould or impression tray with the thickened mixture, and (IV) applying the filled mould or tray to the tooth-stump to which the crown is to be applied, (V) allowing the composition to set, (VI) removing the resultant set crown from the mouth and then from the mould or impression tray, (VII) finishing and polishing the crown, (VIII) filling the crown with dental cement and placing the dental crown on the stump.
Claim 22
Independent Claim
186 words
A method of making permanent dental crowns having high compressive strength and wear resistance which comprises (I) mixing (A) a first component comprising from 25 to 80 parts by weight of a liquid monomer system comprising methyl methacrylate, from 15 to 50% by weight, based on liquid monomer system, of at least one polyethylenically unsaturated crosslinking monomer; and reducing agent; with (B) a second component comprising from 20 to 75 parts by weight of a mixture of (1) organic polymeric particulate substance, and (2) inorganic particulate substance, both of said substances being insoluble in said first component, and oxidizing agent; (II) allowing the resultant mixture to achieve a suitable viscosity, (III) filling a tooth-shaped preformed mould or impression tray with the thickened mixture, and (IV) applying the filled mould or tray to the tooth-stump to which the crown is to be applied, (V) allowing the composition to set, (VI) removing the resultant set crown from the mouth and then from the mould or impression tray, (VII) finishing and polishing the crown, (VIII) filling the crown with dental cement and placing the dental crown on the stump.
Claim 23
Dependent Claim
23 words
A method as claimed in Claim 20 as applied to a composition according to any of claims 2,3 : or 5 to 17.
References Cited (Backward Citations)
No citation records indexed.
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