US5211748A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Identifiable dental restorative material
Assignee: BTG International Ltd
•
Filing: 1992-01-10
•
Granted: 1993-05-18
•
Expires: 2012-01-10
Abstract
Abstract A problem on removing dental restorative material can be to know its exact extent, otherwise sound tooth material may be unnecessarily removed. The inventive restorative material is made identifiable by adding crushed ruby powder, which fluoresces under standard dental blue light.
Inventors
- 👤 Peter B. Robinson
- 👤 Brian J. Millar
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 14:44
CPC Classifications
A; A61; A61K; A61K6/00; A61K6/80; A61K6/884; A61K6/891; A61K6/893; A61K6/887; A61K6/889
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
28 words
A dental restorative composition comprising a dental restorative material and an additive which luminesces when irradiated by visible-wavelength light and does not luminesce when irradiated by ultraviolet light.
Claim 2
Dependent Claim
28 words
A dental restorative composition comprising a dental restorative material and an additive which luminesces when irradiated by visible-wavelength light and does not luminesce when irradiated by ultraviolet light.
Claim 3
Dependent Claim
15 words
A composition according to claim 1, wherein said additive luminesces when irradiated by blue light.
Claim 4
Dependent Claim
18 words
A composition according to claim 1, which is a composite resin, wherein said additive acts as a filler.
Claim 5
Dependent Claim
23 words
A composition according to claim 1, which is a glass ionomer cement, wherein said additive acts as a glass of the glass ionomer.
Claim 6
Dependent Claim
12 words
A composition according to claim 1, wherein said additive is chromium-activated ruby.
Claim 7
Dependent Claim
33 words
A composition according to claim 1, wherein said dental restorative material comprises about 80% by weight of a filler and about 20% by weight urethane dimethacrylate, and said additive is crushed crystalline ruby.
Claim 8
Dependent Claim
21 words
A composition according to claim 6, wherein said dental restorative material comprises about 10% by volume of said crushed crystalline ruby.
Claim 9
Independent Claim
52 words
A method of differentiating tooth material from a dental restorative composition comprising a dental restorative material and an additive which luminesces when irradiated by visible-wavelength light and does not luminesce when irradiated by ultraviolet light, said method comprising the step of: irradiating the tooth to cause the dental restorative composition to luminesce.
Claim 10
Independent Claim
52 words
A method of differentiating tooth material from a dental restorative composition comprising a dental restorative material and an additive which luminesces when irradiated by visible-wavelength light and does not luminesce when irradiated by ultraviolet light, said method comprising the step of: irradiating the tooth to cause the dental restorative composition to luminesce.
Claim 11
Dependent Claim
15 words
A method according to claim 8, wherein said additive luminesces when irradiated by blue light.
Claim 12
Dependent Claim
23 words
A method according to claim 8, wherein said dental restorative composition is a composite resin in which the additive acts as a filler.
Claim 13
Dependent Claim
27 words
A method according to claim 8, wherein said dental restorative composition is a glass ionomer cement and the additive acts as a glass of the glass ionomer.
Claim 14
Dependent Claim
12 words
A method according to claim 8, wherein the additive is chromium-activated ruby.
Claim 15
Independent Claim
82 words
A method for restoring a tooth, comprising the steps of: introducing a dental restorative composition into the tooth to be restored, said dental restorative composition comprising a dental restorative material and an additive which luminesces when irradiated by visible-wavelength light and which does not luminesce when irradiated by ultraviolet light; and inspecting the introduced dental restorative composition by irradiating said dental restorative composition to determine the location of said restorative composition in the tooth and thereby ensure accurate restoration of the tooth.
Claim 16
Independent Claim
82 words
A method for restoring a tooth, comprising the steps of: introducing a dental restorative composition into the tooth to be restored, said dental restorative composition comprising a dental restorative material and an additive which luminesces when irradiated by visible-wavelength light and which does not luminesce when irradiated by ultraviolet light; and inspecting the introduced dental restorative composition by irradiating said dental restorative composition to determine the location of said restorative composition in the tooth and thereby ensure accurate restoration of the tooth.
Claim 17
Dependent Claim
15 words
A method according to claim 13, wherein said additive luminesces when irradiated by blue light.
Claim 18
Dependent Claim
22 words
A method according to claim 13, wherein said dental restorative composition is a composite resin and said additive acts as a filler.
Claim 19
Dependent Claim
27 words
A method according to claim 13, wherein said dental restorative composition is a glass ionomer cement and said additive acts as a glass of the glass ionomer.
Claim 20
Dependent Claim
12 words
A method according to claim 13, wherein said additive is chromium-activated ruby.
References Cited (Backward Citations)
DE1107892B
Cited
FR1471000A
Cited
DE1963552A1
Cited
US4150012A
Cited
US4170823A
Cited
US4167417A
Cited
US4198244A
Cited
GB2064550A
Cited
US4491453A
Cited
US4514174A
Cited
US4746685A
Cited
US4600389A
Cited
US5035621A
Cited
US5012461A
Cited
US4957441A
Cited
US5015180A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1996-05-17 | 1996-11-16 | 1997-05-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-05-17 | 2000-11-16 | 2001-05-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-05-17 | 2004-11-16 | 2005-05-18 | $7700.00 | Window Closed / Lapsed |