US4645455A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Uniformly fluorescing porcelain dental restorations
Assignee: Austenal Inc
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Filing: 1983-08-19
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Granted: 1987-02-24
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Expires: 2003-08-19
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
2026-10-27 10:44
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
123 words
A porcelain veneered dental restoration having a substructure and an overlaying opaque layer, a body layer and an incisal layer, each of said layers containing an effective amount of a UV fluorescing agent, wherein said UV fluorescing agent is 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, gadolinium 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
123 words
A porcelain veneered dental restoration having a substructure and an overlaying opaque layer, a body layer and an incisal layer, each of said layers containing an effective amount of a UV fluorescing agent, wherein said UV fluorescing agent is 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, gadolinium 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
115 words
A porcelain veneered dental restoration having a substructure and an overlaying opaque layer, a body layer and an incisal layer, each of said layers containing an effective amount of a UV fluorescing agent, wherein said UV fluorescing agent is an inorganic pigment of the approximate composition (Y 0 .97 Ce 0 .01 Tb 0 .02 Mn 0 .002) 2 O 3 .SiO 2 , wherein Y=yttrium, Ce=cerium, Tb=terbium, and Mn=manganese, 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
115 words
A porcelain veneered dental restoration having a substructure and an overlaying opaque layer, a body layer and an incisal layer, each of said layers containing an effective amount of a UV fluorescing agent, wherein said UV fluorescing agent is an inorganic pigment of the approximate composition (Y 0 .97 Ce 0 .01 Tb 0 .02 Mn 0 .002) 2 O 3 .SiO 2 , wherein Y=yttrium, Ce=cerium, Tb=terbium, and Mn=manganese, 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) | 1990-02-23 | 1990-08-25 | 1991-02-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-02-23 | 1994-08-25 | 1995-02-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-02-23 | 1998-08-25 | 1999-02-24 | $7700.00 | Window Closed / Lapsed |