US4351853A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for producing prosthetic dental appliances by photopolymerizing a shapeable mass
Assignee: THERA-PATENT GmbH and Co KG
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Filing: 1981-01-15
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Granted: 1982-09-28
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Expires: 2001-01-15
Abstract
Abstract PCT No. PCT/DE81/00014 Sec. 371 Date Sep. 11, 1981 Sec. 102(e) Date Sep. 11, 1981 PCT Filed Jan. 15, 1981 PCT Pub. No. WO81/01959 PCT Pub. Date Jul. 23, 1981.Prosthetic dental appliances of stable color and good mechanical properties can be produced by photopolymerization of one-component preparations which are stable during the storage, on the basis of ethylenically unsaturated monomers as well as fillers and dyes when using bicyclo-[2.2.1]-heptane-dione-2,3 compounds, if necessary together with amines, as photoinitiators for achieving sufficient penetration of the polymerization and whose inherent yellow color after short primary irradiation with visible light is bleached out for fixation permanently by intensive postirradiation with visible light.
Inventors
- 👤 Peter Jochum
- 👤 Oswald Gasser
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:41
CPC Classifications
A; A61; A61K; A61K6/00; A61K6/80; A61K6/884; A61K6/887
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
62 words
Method for production of prosthetic dental appliances by photopolymerizing of a deformable mass, comprising ethylenically unsaturated polymerizable monomer compounds and as photoinitiators, 1,2-diketones, as well as possibly fillers, dyes and inhibitors, characterized in that the mass containing a bicyclo-[2.2.1]-heptane-dione-2,3 compound as 1,2-diketone is polymerized by irradiation and then in the obtained prosthetic dental appliance the photoinitiator is bleached out through further irradiation.
Claim 2
Dependent Claim
62 words
Method for production of prosthetic dental appliances by photopolymerizing of a deformable mass, comprising ethylenically unsaturated polymerizable monomer compounds and as photoinitiators, 1,2-diketones, as well as possibly fillers, dyes and inhibitors, characterized in that the mass containing a bicyclo-[2.2.1]-heptane-dione-2,3 compound as 1,2-diketone is polymerized by irradiation and then in the obtained prosthetic dental appliance the photoinitiator is bleached out through further irradiation.
Claim 3
Dependent Claim
25 words
Method as defined in claim 1, characterized in that the mass contains 0.01 to 1 percent by weight, preferably 0.05-0.5 percent by weight bicyclo-[2.2.1]-heptane-dione-2,3 compound.
Claim 4
Dependent Claim
18 words
Method as defined in claims 1 and 2, characterized in that the mass contains an amine as activator.
Claim 5
Dependent Claim
24 words
Method as defined in claim 3, characterized in that the amine is a tertiary amine, carrying preferably three substituted hydrocarbon residues at the nitrogen.
Claim 6
Dependent Claim
54 words
Method as defined in claims 1 to 4, characterized in that the deformable mass is applied on a base by layers, each layer being polymerized by irradiation and cured before applying the next layer whereupon the photoinitiator is bleached out through further irradiation after the curing of the last layer in the obtained appliance.
Claim 7
Dependent Claim
18 words
Method as defined in claims 1 to 5, characterized in that camphor quinone is used as bicyclo-[2.2.1]-heptanedione-2,3 compound.
Claim 8
Dependent Claim
27 words
Method as defined in claims 1 to 6, characterized in that the bleaching is performed by an irradiation within the wave-length range between 400 and 500 nm.
Claim 9
Dependent Claim
18 words
Method as defined in claims 1 to 7, characterized in that pyrogenic silicic acid is used as filler.
Claim 10
Dependent Claim
20 words
Method as defined in claims 1 to 8, characterized in that calcium fluoride is used as filler and/or white pigment.
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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) | 1985-09-27 | 1986-03-29 | 1986-09-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-09-27 | 1990-03-29 | 1990-09-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-09-27 | 1994-03-29 | 1994-09-28 | $7700.00 | Window Closed / Lapsed |