US4741699A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Uniformly fluorescing porcelain dental restorations
Assignee: Austenal Inc
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Filing: 1986-09-12
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Granted: 1988-05-03
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Expires: 2006-09-12
Abstract
Abstract A porcelain veneered dental restoration in which UV fluorescing agent is present in each of the opaque, body and incisal layers at a level to provide the restoration with a uniform fluorescence matching that of natural teeth.
Inventors
- 👤 Peter Kosmos
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 21:59
CPC Classifications
A; A61; A61C; A61C13/00; A61C13/08; A61C13/09; A61C5/00; A61C5/70; A61C5/73; A61C5/77; A61K; A61K6/00; A61K6/70; A61K6/78; A61C19/00; A61C19/003
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
133 words
An unfired dental porcelain formulation for imparting a level of fluorescence to match the level of a natural tooth in a dental restoration containing an opaque porcelain layer, a body porcelain layer, and an incisal porcelain layer, said formulation comprising a base porcelain powder, a stained porcelain powder, and an inorganic pigment of the formula: (X.SE+A.Ce+B.Tb+C.Mn).sub.2 O.sub.3.SiO.sub.2 wherein SE=at least one of the elements yttrium, gadolinum, and lanthanum; Ce=cerium; Tb=terbium; Mn=manganese; A=0.005 to 0.1 mole fraction; B=0.005 to 0.1 mole fraction; C=0.001 to 0.025 mole fraction; and X=1.0-(A+B+C), and wherein said inorganic pigment is present at a level of from about 1.5 to 10 weight percent in the opaque layer; from about 0.05 to 0.5 weight percent in the body layer; and from about 0.02 to 0.2 weight percent in the incisal layer.
Claim 2
Dependent Claim
133 words
An unfired dental porcelain formulation for imparting a level of fluorescence to match the level of a natural tooth in a dental restoration containing an opaque porcelain layer, a body porcelain layer, and an incisal porcelain layer, said formulation comprising a base porcelain powder, a stained porcelain powder, and an inorganic pigment of the formula: (X.SE+A.Ce+B.Tb+C.Mn).sub.2 O.sub.3.SiO.sub.2 wherein SE=at least one of the elements yttrium, gadolinum, and lanthanum; Ce=cerium; Tb=terbium; Mn=manganese; A=0.005 to 0.1 mole fraction; B=0.005 to 0.1 mole fraction; C=0.001 to 0.025 mole fraction; and X=1.0-(A+B+C), and wherein said inorganic pigment is present at a level of from about 1.5 to 10 weight percent in the opaque layer; from about 0.05 to 0.5 weight percent in the body layer; and from about 0.02 to 0.2 weight percent in the incisal layer.
Claim 3
Dependent Claim
103 words
An unfired dental porcelain formulation for imparting a level of fluorescence to match the level of a natural tooth in a dental restoration containing an opaque porcelain layer, a body porcelain layer, and an incisal porcelain layer, said formulation comprising a base porcelain, a stained porcelain, and an inorganic pigment of the formula: (Y.sub.0.97 Ce.sub.0.01 Tb.sub.0.02 Mn.sub.0.002).sub.2 O.sub.3.SiO.sub.2 and wherein said inorganic pigment is present at a level of from about 1.5 to 6 weight percent in the opaque layer; from about 0.1 to 0.2 weight percent in the body layer; and from about 0.05 to 0.10 weight percent in the incisal layer.
Claim 4
Dependent Claim
103 words
An unfired dental porcelain formulation for imparting a level of fluorescence to match the level of a natural tooth in a dental restoration containing an opaque porcelain layer, a body porcelain layer, and an incisal porcelain layer, said formulation comprising a base porcelain, a stained porcelain, and an inorganic pigment of the formula: (Y.sub.0.97 Ce.sub.0.01 Tb.sub.0.02 Mn.sub.0.002).sub.2 O.sub.3.SiO.sub.2 and wherein said inorganic pigment is present at a level of from about 1.5 to 6 weight percent in the opaque layer; from about 0.1 to 0.2 weight percent in the body layer; and from about 0.05 to 0.10 weight percent in the incisal layer.
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) | 1991-05-03 | 1991-11-02 | 1992-05-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-05-03 | 1995-11-02 | 1996-05-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-05-03 | 1999-11-02 | 2000-05-03 | $7700.00 | Window Closed / Lapsed |