US4802850A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dental-porcelain color matching system
Assignee: Individual
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Filing: 1987-04-21
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Granted: 1989-02-07
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Expires: 2007-04-21
Abstract
Abstract A dental-porcelain color matching system comprises a plurality of dental-porcelain beads arranged in a closely spaced manner on a common support so that their colors vary in an ordered manner. The beads are carried at the ends of arms which are either flexible or pivotable on a main trunk of the support so that a bead to be located against a patent's natural tooth for color comparison therewith can be moved away from other beads on the support to avoid color interference therefrom. Additional beads provided have varying translucent enamels on opaque porcelain bases to allow the color, translucency and depth of enamel of a patient's teeth to be gauged. The beads also vary in shape from that of an unworn natural incisor tooth with a ridged cutting edge to that of a worn incisor tooth with a smooth cutting edge.
Inventors
- 👤 David G. Boon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 21:19
CPC Classifications
A; A61; A61C; A61C19/00; A61C19/10
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
135 words
A set of dental porcelain beads for incorporation in a dental-porcelain color matching system, each said bead comprising an opaque dental-porcelain base in the shape of an incisor tooth with a coating of translucent enamel, at least some of said bases having the shape of the dentine layer of an unworn natural incisor tooth with a ridged cutting edge, at least some of said bases having the shape of the dentine layer of a worn incisor tooth with a smooth cutting edge, and at least some of said bases having the shape of the dentine layer in one of the successive stages between that of an unworn natural incisor tooth and a worn incisor tooth, and said enamel coatings varying in thickness so as substantially to simulate the enamel layer of the corresponding natural tooth.
Claim 2
Dependent Claim
135 words
A set of dental porcelain beads for incorporation in a dental-porcelain color matching system, each said bead comprising an opaque dental-porcelain base in the shape of an incisor tooth with a coating of translucent enamel, at least some of said bases having the shape of the dentine layer of an unworn natural incisor tooth with a ridged cutting edge, at least some of said bases having the shape of the dentine layer of a worn incisor tooth with a smooth cutting edge, and at least some of said bases having the shape of the dentine layer in one of the successive stages between that of an unworn natural incisor tooth and a worn incisor tooth, and said enamel coatings varying in thickness so as substantially to simulate the enamel layer of the corresponding natural tooth.
Claim 3
Dependent Claim
172 words
A dental-porcelain color matching system comprising a plurality of dental-porcelain beads of different colors carried on a support adapted to allow at least some of said beads to be moved apart so that each said bead can be placed individually against a patient's natural tooth for color comparison with that tooth without color interference from any other bead on said support, wherein said support comprises an elongate body part with a stepped surface and a plurality of respective pivot points, the arms projecting from a respective said pivot point in a common plane and each arm carrying a said bead at its free end, wherein each said group is pivotally attached at its pivot point to a respective step of said stepped surface such that said groups lie in planes parallel to said steps and overlap each other in a stored condition of the system so that the beads are closely spaced but all are visible, and wherein each group is pivotable in its plane into a position for said color comparison.
Claim 4
Dependent Claim
172 words
A dental-porcelain color matching system comprising a plurality of dental-porcelain beads of different colors carried on a support adapted to allow at least some of said beads to be moved apart so that each said bead can be placed individually against a patient's natural tooth for color comparison with that tooth without color interference from any other bead on said support, wherein said support comprises an elongate body part with a stepped surface and a plurality of respective pivot points, the arms projecting from a respective said pivot point in a common plane and each arm carrying a said bead at its free end, wherein each said group is pivotally attached at its pivot point to a respective step of said stepped surface such that said groups lie in planes parallel to said steps and overlap each other in a stored condition of the system so that the beads are closely spaced but all are visible, and wherein each group is pivotable in its plane into a position for said color comparison.
Claim 5
Dependent Claim
96 words
A dental-porcelain color matching system comprising a plurality of dental-porcelain beads of different colors carried on support adapted to allow at least some of said beads to be moved apart so that each said bead can be placed individually against a patient's natural tooth for color comparison with that tooth without color interference from any other bead on said support, wherein said support is made from a material selected from flexible and flexibly-resilient materials to allow beads which are closely spaced in a relaxed condition of the support to be moved apart for said color comparison.
Claim 6
Dependent Claim
96 words
A dental-porcelain color matching system comprising a plurality of dental-porcelain beads of different colors carried on support adapted to allow at least some of said beads to be moved apart so that each said bead can be placed individually against a patient's natural tooth for color comparison with that tooth without color interference from any other bead on said support, wherein said support is made from a material selected from flexible and flexibly-resilient materials to allow beads which are closely spaced in a relaxed condition of the support to be moved apart for said color comparison.
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) | 1992-02-07 | 1992-08-08 | 1993-02-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-02-07 | 1996-08-08 | 1997-02-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-02-07 | 2000-08-08 | 2001-02-07 | $7700.00 | Window Closed / Lapsed |