US4381918A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of producing a composite resin, preferably for use as a dental material
Assignee: AUSTENAL INTERNATIONAL Inc A CORP OF
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Filing: 1981-09-17
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Granted: 1983-05-03
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Expires: 2001-09-17
Abstract
Abstract A method of producing a composite of organic resin and inorganic porous particles, preferably for use as a dental restoration material, which comprises impregnating porous inorganic particles with an at least partially hardenable resin material, compressing or otherwise applying pressure in such a way that the particles contact each other and the pressure in the resin is equalized by viscous flow of excess resin through the pores of the inorganic particles, bonding together by hardening of at least a portion of the hardenable resin material, thereby forming a resin structure including a contiguous inorganic phase.
Inventors
- 👤 Lars E. M. Ehrnford
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 20:57
CPC Classifications
A; A61; A61C; A61C13/00; A61C13/12; A61C13/14; A61K; A61K6/00; A61K6/30; A61K6/70; A61K6/71; A61K6/77; A61K6/80; A61K6/884; A61K6/887; A61L; A61L27/00; A61L27/40; A61L27/44; A61L27/446
Claims Analysis
Total Claims: 38
Claim 1
Independent Claim
138 words
A method of producing a dental restoration composite containing an organic resin and inorganic porous particles which comprises impregnating open porous inorganic particles with an at least partially hardenable resin material, compressing in such a way that the particles contact each other and the pressure in the resin is equalized by viscous flow of excess resin through the pores of the inorganic particles, bonding together by hardening of at least a portion of the hardenable resin material thereby forming a resin structure including a polymer impregnated contiguous inorganic phase wherein the porous inorganic particles comprise a rigid three-dimensional network of inorganic fibers fused together by heating at a temperature sufficient to cause melting and complete fusing together of substantially all individual fibers at their points of contact into a network where the porosity is continuous throughout the network.
Claim 2
Independent Claim
138 words
A method of producing a dental restoration composite containing an organic resin and inorganic porous particles which comprises impregnating open porous inorganic particles with an at least partially hardenable resin material, compressing in such a way that the particles contact each other and the pressure in the resin is equalized by viscous flow of excess resin through the pores of the inorganic particles, bonding together by hardening of at least a portion of the hardenable resin material thereby forming a resin structure including a polymer impregnated contiguous inorganic phase wherein the porous inorganic particles comprise a rigid three-dimensional network of inorganic fibers fused together by heating at a temperature sufficient to cause melting and complete fusing together of substantially all individual fibers at their points of contact into a network where the porosity is continuous throughout the network.
Claim 3
Dependent Claim
39 words
A method as claimed in claim 1, wherein the porous inorganic particles are brought into contact with each other such that the major part of their interface contact each other and there is mechanical interlocking of the inorganic particles.
Claim 4
Dependent Claim
30 words
The method as claimed in claim 2, characterized in that the porous inorganic particles are brought in contact with each other such that they obtain intimate contact by surface crushing.
Claim 5
Dependent Claim
30 words
The method as claimed in claim 3, wherein the particle crushing is such that the particles conform to each other to an extent that practically no interparticle spaces are left.
Claim 6
Dependent Claim
25 words
The method as claimed in claim 1, wherein the porous inorganic particles are impregnated with resin material such that excess of resin material is formed.
Claim 7
Dependent Claim
20 words
The method as claimed in claim 1, wherein the porous inorganic particles have a diameter of less than 500 microns.
Claim 8
Dependent Claim
20 words
The method as claimed in claim 6, wherein the porous inorganic particles have a diameter of less than 300 microns.
Claim 9
Dependent Claim
29 words
The method as claimed in claim 7, wherein 10-90% by weight of the porous inorganic particles have a diameter of at least 10 microns but less than 100 microns.
Claim 10
Dependent Claim
29 words
The method as claimed in claim 8, wherein 10-40% by weight of the porous inorganic particles have a diameter of at least 10 microns but less than 100 microns.
Claim 11
Dependent Claim
16 words
The method as claimed in claim 1, wherein the fibres are made of a ceramic material.
Claim 12
Dependent Claim
11 words
The method of claim 10 wherein the ceramic material is glass.
Claim 13
Dependent Claim
18 words
The method as claimed in claim 11, wherein the glass has a high density as determined by X-rays.
Claim 14
Dependent Claim
21 words
The method as claimed in claim 12, wherein the fibres in the networks have a diameter of less than 100 microns.
Claim 15
Dependent Claim
18 words
The method as claimed in claim 13, wherein the fibres have a diameter of less than 10 microns.
Claim 16
Dependent Claim
18 words
The method as claimed in claim 14, wherein the fibres have a diameter of less than 4 microns.
Claim 17
Dependent Claim
15 words
The method of claim 15 wherein the fibres have a diameter of from 1-3 microns.
Claim 18
Dependent Claim
16 words
The method as claimed in claim 1, wherein the hardenable resin material contains nonporous inorganic particles.
Claim 19
Dependent Claim
19 words
The method as claimed in claim 17, wherein the inorganic particles in the hardenable resin material comprise ceramic particles.
Claim 20
Dependent Claim
19 words
The method as claimed in claim 18, wherein the ceramic particles are of aluminumoxide or siliconedioxide (SiO 2 ).
Claim 21
Dependent Claim
14 words
The method as claimed in claim 19, wherein the ceramic particles are glass particles.
Claim 22
Dependent Claim
22 words
The method as claimed in claim 18, wherein the inorganic particles in the hardenable resin material have a high radiopacity to X-rays.
Claim 23
Dependent Claim
22 words
The method as claimed in claim 18, wherein the inorganic particles in the hardenable resin material have a size below 2 microns.
Claim 24
Dependent Claim
26 words
The method as claimed in claim 22, wherein the inorganic particles in the hardenable resin material are within the size range of 0.005 to 0.4 microns.
Claim 25
Dependent Claim
29 words
The method as claimed in claim 22, wherein the inorganic particles in the hardenable resin comprise 10 to 90 percent of the total weight of the particle resin mixture.
Claim 26
Dependent Claim
55 words
The method as claimed in claim 1, wherein the inorganic porous particles have been pretreated with an organofunctional silane adhesion promoting coupling agent whereby a chemical adhesion mechanism and a bonding mechanism involving physical penetration and interlocking contribute to the improved integrity and durability of the porous inorganic particles in combination with an organic resin.
Claim 27
Dependent Claim
39 words
The method as claimed in claim 25, wherein at least a portion of the silane bonding agent is incorporated in the resin in an amount of 0.05 to 10% by weight based on the weight of the total composition.
Claim 28
Dependent Claim
19 words
The method as claimed in claim 1, wherein the porous inorganic particles contain 30-80% by volume of inorganic substance.
Claim 29
Dependent Claim
20 words
The method as claimed in claim 17, wherein the size of the porous inorganic particles is less than 300 microns.
Claim 30
Dependent Claim
28 words
The method as claimed in claim 1 wherein the porous inorganic particles in their outer portions contain hardenable resin material and in their central portion hardened resin material.
Claim 31
Dependent Claim
37 words
The method according to claim 1 wherein the porous inorganic particles are impregnated with a thermoplastic resin and that the compression of the mass occurs during heating is such that the porous inorganic particles are bonded together.
Claim 32
Dependent Claim
38 words
The method as claimed in claim 1 or 17, wherein the hardenable resin material comprises substantially at least one monomer and/or polymer selected from the group consisting of acrylic resin, vinyl chloride, cellulose acetate, styrene and acrylonitrile copolymer.
Claim 33
Dependent Claim
32 words
The method as claimed in claim 31, wherein the hardenable resin is at least one acrylic monomer and/or polymer selected from the group consisting of ethyl methacrylate, ethyl acrylate, and methyl metacrylate.
Claim 34
Dependent Claim
24 words
The method as claimed in claim 31, wherein the hardenable resin material is substantially a copolymer of an acrylic monomer and another copolymerizable monomer.
Claim 35
Dependent Claim
33 words
The method as claimed in claim 31, wherein the hardenable resin is copolymer of an acrylic monomer and another copolymerizable monomer selected from the group consisting of styrene, butadiene, ethylene and acrylic acid.
Claim 36
Dependent Claim
22 words
The method as claimed in claim 31, wherein the hardenable resin material comprises substantially Bis-GMA or any other derivative of Bisphenol A.
Claim 37
Dependent Claim
21 words
The method as claimed in claim 1, wherein the hardening of the resin is achieved through photoinitiation of a polymerization reaction.
Claim 38
Dependent Claim
66 words
The method as claimed in claim 1, wherein a composite resin consisting essentially of porous inorganic particles which are completely or partially impregnated with an at least partially polymerizable monomer and/or polymer and which particles are condensed or otherwise applied in such a way that the particles contact each other and on polymerization are bonded together to form a resin structure including a contiguous inorganic phase.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-05-02 | 1986-11-01 | 1987-05-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-05-02 | 1990-11-01 | 1991-05-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-05-02 | 1994-11-01 | 1995-05-03 | $7700.00 | Window Closed / Lapsed |