Patent US4585667A successfully refreshed from Google Patents.
US4585667A
Expired / Lapsed
US
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Process for producing plaster models for use in dentistry
Assignee: SIH Stiftung and Co Industrie Holding KG
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Filing: 1984-12-28
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Granted: 1986-04-29
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Expires: 2004-12-28
Abstract
Abstract The physical properties, especially resistance to abrasion, to bending and to pressure, of plaster models for use in dentistry are improved in that a plaster model obtained in a manner known in the art is impregnated with (a) at least one photopolymerizable ester of acrylic and/or methacrylic acid, (b) at least one photopolymerization initiator, and (c) optionally at least one photopolymerization activator--(a), (b) and (c) being present in liquid or dissolved state--and the impregnated plaster model is irradiated with light suitable to initiate photopolymerization by the photoinitiator.
Inventors
- 👤 Heijo Hubner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 23:23
CPC Classifications
A; A61; A61K; A61K6/00; A61K6/80; A61K6/884; A61K6/887
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
61 words
A process for producing plaster models for use in dentistry which possess an improved resistance to abrasion, bending and pressure which comprises impregnating a plaster model with (a) at least one photopolymerizable ester of acrylic and/or methacrylic acid and (b) at least one photopolymerization initiator and irradiating the impregnated plaster model with light suited for initiating the photopolymerization by the photoinitiator.
Claim 2
Dependent Claim
61 words
A process for producing plaster models for use in dentistry which possess an improved resistance to abrasion, bending and pressure which comprises impregnating a plaster model with (a) at least one photopolymerizable ester of acrylic and/or methacrylic acid and (b) at least one photopolymerization initiator and irradiating the impregnated plaster model with light suited for initiating the photopolymerization by the photoinitiator.
Claim 3
Dependent Claim
19 words
The process of claim 1 wherein the plaster model is additionally impregnated with (c) at least one photopolymerization activator.
Claim 4
Dependent Claim
18 words
The process of claim 1 wherein components (a) and (b) are present in a liquid or dissolved state.
Claim 5
Dependent Claim
19 words
The process of claim 2 wherein components (a), (b) and (c) are present in a liquid or dissolved state.
Claim 6
Dependent Claim
24 words
The process of claim 1 wherein component (b) and at least a portion of component (a) are employed in the form of a mixture.
Claim 7
Dependent Claim
25 words
The process of claim 2 wherein components (b), (c) and at least a portion of component (a) are employed in the form of a mixture.
Claim 8
Dependent Claim
26 words
The process of claim 2 wherein the components (a), (b) and (c) and mixtures and solutions thereof have a viscosity of up to about 5 poises.
Claim 9
Dependent Claim
13 words
The process of claim 1 wherein component (a) includes urethane acrylates and methacrylates.
Claim 10
Dependent Claim
22 words
The process of claim 1 wherein component (a) is selected from the group consisting of mono-, di-, and polyfunctional acrylates and methacrylates.
Claim 11
Dependent Claim
15 words
The process of claim 1 wherein the monofunctional derivatives are methyl methacrylate and hydroxyethyl methacrylate.
Claim 12
Dependent Claim
29 words
The process of claim 1 wherein the photopolymerization initiator is selected from the group consisting of aromatic monoketones, aromatic and aliphatic 1,2-diketones,thioxanthones, benzoine ethers, benzil ketals and mixtures thereof.
Claim 13
Dependent Claim
25 words
The process of claim 11 wherein the photopolymerization initiator is present in an amount of about 0.01 to 3% by weight, based on component (a).
Claim 14
Dependent Claim
22 words
The process of claim 2 wherein the photoactivator is selected from the group consisting of tertiary amines, cyclic 1,3-diketones and organic phosphites.
Claim 15
Dependent Claim
27 words
The process of claim 1 further including the addition of (d) an organic peroxide or hydroperoxide and (e) aromatic amines or thiourea derivatives as an activator therefor.
Claim 16
Dependent Claim
89 words
A process for producing a plaster model for use in dentistry which possesses an improved resistance to abrasion, bending and pressure which comprises impregnating a plaster model with (a) at least one photopolymerizable ester of acrylic and/or methacrylic acid and (b) at least one photopolymerization initiator, said impregnation being conducted for a period of time sufficient to provide a penetration depth of component (a) into the plaster model of at least 0.1 mm, and irradiating the impregnated plaster model with light suited for initiating the photopolymerization by the photoinitiator.
Claim 17
Dependent Claim
89 words
A process for producing a plaster model for use in dentistry which possesses an improved resistance to abrasion, bending and pressure which comprises impregnating a plaster model with (a) at least one photopolymerizable ester of acrylic and/or methacrylic acid and (b) at least one photopolymerization initiator, said impregnation being conducted for a period of time sufficient to provide a penetration depth of component (a) into the plaster model of at least 0.1 mm, and irradiating the impregnated plaster model with light suited for initiating the photopolymerization by the photoinitiator.
Claim 18
Dependent Claim
18 words
A process according to claim 15, wherein said penetration depth of component (a) is at least 0.5 mm.
References Cited (Backward Citations)
EP0073995A1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-04-28 | 1989-10-28 | 1990-04-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-04-28 | 1993-10-28 | 1994-04-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-04-28 | 1997-10-28 | 1998-04-29 | $7700.00 | Window Closed / Lapsed |