US4267097A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Material for dental purposes
Assignee: Perdent GmbH
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Filing: 1975-01-23
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Granted: 1981-05-12
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Expires: 1995-01-23
Abstract
Abstract Polymerizable dental materials are provided containing at least one polymerizable monomer and/or polymer and a finely divided inorganic filler, said filler being present in an amount of about 10 to 90% based on the weight of the material and having a particle size within the range of 10 to 400 mμ, said material when polymerized having an extremely high compressive strength, excellent transparency and a very smooth homogeneous surface.
Inventors
- 👤 Rudy Michl
- 👤 Peter Wollwage
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 23:39
CPC Classifications
A; A61; A61K; A61K6/00; A61K6/80; A61K6/884; A61K6/887
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
171 words
A composition for dental uses, such as prostheses, filing materials or the like, comprising: a first component comprising a monomeric binding material selected from a member of the group consisting of (a) long chain monomer esters of bisphenol A and glycidyl methacrylates, (b) adducts of diisocyanates and hydroxymethylacrylates, (c) difunctional esters of acrylic and methacrylic acids, and (d) mixtures of two, or of three of (a), (b) and (c), and a second component comprising a micro-fine inorganic filler being present in an amount of about 50 to 90% based on the weight of said composition and having a particle size within the range of about 10 to 400 millimicrons and a BET surface area of less than about 200 m 2 /g, wherein at least 50% of the filler particles have a particle size within the range of 10 to 40 millimicrons, in admixture with at least one bead or chip polymer of the group consisting of polyvinylchloride and copolymers thereof, polystyrene and copolymers thereof, polyamides, polymeric acrylates and polymeric methacrylates.
Claim 2
Dependent Claim
171 words
A composition for dental uses, such as prostheses, filing materials or the like, comprising: a first component comprising a monomeric binding material selected from a member of the group consisting of (a) long chain monomer esters of bisphenol A and glycidyl methacrylates, (b) adducts of diisocyanates and hydroxymethylacrylates, (c) difunctional esters of acrylic and methacrylic acids, and (d) mixtures of two, or of three of (a), (b) and (c), and a second component comprising a micro-fine inorganic filler being present in an amount of about 50 to 90% based on the weight of said composition and having a particle size within the range of about 10 to 400 millimicrons and a BET surface area of less than about 200 m 2 /g, wherein at least 50% of the filler particles have a particle size within the range of 10 to 40 millimicrons, in admixture with at least one bead or chip polymer of the group consisting of polyvinylchloride and copolymers thereof, polystyrene and copolymers thereof, polyamides, polymeric acrylates and polymeric methacrylates.
Claim 3
Dependent Claim
29 words
The composition according to claim 1, wherein the filler of the second component is present in an amount of 50 to 75% based on the weight of the composition.
Claim 4
Dependent Claim
30 words
The composition according to claim 1, characterized by the fact that the micro-fine inorganic filler is a member selected from the group consisting of silicondioxide, aluminum oxide and silicate glass.
Claim 5
Dependent Claim
22 words
The composition according to claim 3, characterized by the fact that the micro-fine inorganic filler is silanized before mixing with said polymer.
Claim 6
Dependent Claim
31 words
The composition according to claim 1, wherein the monomeric binding material is selected from a member of the group consisting of long chain monomer esters of bisphenol A and glycidyl methacrylates.
Claim 7
Dependent Claim
26 words
The composition according to claim 1, wherein the monomeric binding material is selected from a member of the group consisting of adducts of diisocyanates and hydroxymethylacrylates.
Claim 8
Dependent Claim
28 words
The composition according to claim 1, wherein the monomeric binding material is selected from a member of the group consisting of difunctional esters of acrylic and methacrylic acids.
Claim 9
Dependent Claim
12 words
The composition according to claim 1, wherein the polymer comprises a polymethylmethacrylate.
Claim 10
Dependent Claim
18 words
The composition according to claim 1, wherein the surface area is between 30 and 80 m 2 /g.
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) | 1984-05-11 | 1984-11-10 | 1985-05-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-05-11 | 1988-11-10 | 1989-05-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-05-11 | 1992-11-10 | 1993-05-12 | $7700.00 | Window Closed / Lapsed |