Patent US3896804A successfully refreshed from Google Patents.
US4378248A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Bonding dental porcelain
Assignee: Individual
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Filing: 1981-06-30
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Granted: 1983-03-29
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Expires: 2001-06-30
Abstract
Abstract The bonding of smooth dental porcelain using glass-ionomer cement has hitherto been difficult. The present invention incorporates particles of an ion-leachable glass, particularly a calcium fluoroaluminosilicate glass, in the dental porcelain and improves the bonding properties.
Inventors
- 👤 Jack R. Griffith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:52
CPC Classifications
C; C03; C03C; C03C4/00; C03C4/0035; A; A61; A61K; A61K6/00; A61K6/15; A61K6/17; A61K6/30; A61K6/70; A61K6/71; A61K6/77; A61K6/80; A61K6/831; A61K6/833
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
91 words
A composition useful for the preparation of a dental porcelain, said porcelain being capable of being bonded by means of a cement comprising a poly(carboxylic acid) which composition comprises a dental porcelain powder suitable for the production of dental porcelain; an ion-leachable glass in particulate form in intimate admixture with said dental porcelain powder; said ion-leachable glass in admixture with said porcelain powder being a calcium fluoroaluminosilicate glass having a particle size in the range 100-400 microns, and said ion-leachable glass particles constituting 10 to 65% by weight of said composition.
Claim 2
Dependent Claim
91 words
A composition useful for the preparation of a dental porcelain, said porcelain being capable of being bonded by means of a cement comprising a poly(carboxylic acid) which composition comprises a dental porcelain powder suitable for the production of dental porcelain; an ion-leachable glass in particulate form in intimate admixture with said dental porcelain powder; said ion-leachable glass in admixture with said porcelain powder being a calcium fluoroaluminosilicate glass having a particle size in the range 100-400 microns, and said ion-leachable glass particles constituting 10 to 65% by weight of said composition.
Claim 3
Dependent Claim
68 words
A fired and shaped dental porcelain containing dental porcelain powder and having incorporated therein an ion-leachable glass in particulate form, the porcelain being capable of being bonded by means of a cement comprising a poly(carboxylic acid), wherein said ion-leachable glass is a calcium Fluoroaluminosilicate glass having a particle size in the range 100-400 microns, and said ion-leachable glass particles constitute 10 to 65% by weight of said porcelain.
Claim 4
Dependent Claim
68 words
A fired and shaped dental porcelain containing dental porcelain powder and having incorporated therein an ion-leachable glass in particulate form, the porcelain being capable of being bonded by means of a cement comprising a poly(carboxylic acid), wherein said ion-leachable glass is a calcium Fluoroaluminosilicate glass having a particle size in the range 100-400 microns, and said ion-leachable glass particles constitute 10 to 65% by weight of said porcelain.
Claim 5
Dependent Claim
29 words
A dental porcelain according to claim 2 wherein the glass particles are concentrated at a region of said porcelain adjacent a surface thereof to be bonded by said cement.
Claim 6
Dependent Claim
33 words
A dental porcelain according to either of claims 2 or 3 wherein a surface of said porcelain to be bonded by said cement has been abraded to expose particles of said ion-leachable glass.
Claim 7
Independent Claim
92 words
A method for the preparation of a dental porcelain, said porcelain being capable of being bonded by means of a cement comprising a poly(carboxylic acid), which method comprises: (1) admixing a slurry comprising a dental porcelain powder with a particulate ion-leachable glass, said ion-leachable glass in admixture with said porcelain powder being a calcium fluoroaluminosilicate glass having a particle size in the range 100-400 microns, and said glass particles constituting 10 to 65% by weight of said admixture; (2) shaping the admixture into the desired form and (3) firing said formed admixture.
Claim 8
Independent Claim
92 words
A method for the preparation of a dental porcelain, said porcelain being capable of being bonded by means of a cement comprising a poly(carboxylic acid), which method comprises: (1) admixing a slurry comprising a dental porcelain powder with a particulate ion-leachable glass, said ion-leachable glass in admixture with said porcelain powder being a calcium fluoroaluminosilicate glass having a particle size in the range 100-400 microns, and said glass particles constituting 10 to 65% by weight of said admixture; (2) shaping the admixture into the desired form and (3) firing said formed admixture.
Claim 9
Dependent Claim
47 words
A method according to claim 5 which comprises the step of vibrating said admixture in a mould prior to firing, whereby particles of said glass settle and are concentrated in a region of said porcelain adjacent a surface thereof which is to be bonded by said cement.
References Cited (Backward Citations)
US4123416A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-03-28 | 1986-09-27 | 1987-03-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-03-28 | 1990-09-27 | 1991-03-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-03-28 | 1994-09-27 | 1995-03-29 | $7700.00 | Window Closed / Lapsed |