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Patent US4661070A successfully refreshed from Google Patents.
US4661070A
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Method for bleaching discolored teeth
Assignee: Demetron Research Corp
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Filing: 1986-03-17
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Granted: 1987-04-28
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Expires: 2006-03-17
Abstract
Abstract A method for bleaching stained teeth by applying a concentrated solution of peroxide to the stained teeth and focusing a beam of light at the teeth with the beam containing the combination of ultraviolet and infrared energy for activating the peroxide solution.
Inventors
- 👤 Joshua Friedman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 20:04
CPC Classifications
A; A61; A61C; A61C19/00; A61C19/003; A61C19/004; A61C19/06; A61C19/063; A61C19/066
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
99 words
A method for treating discolored teeth comprising the steps of: applying a concentrated solution of peroxide to the pulp chamber of non-vital teeth and/or upon the surface of discolored teeth within the mouth of a dental patient; focusing a beam of optical energy directly upon each discolored tooth to be treated, with said beam containing ultraviolet energy in the 320 to 420 nanometer range in combination with infrared energy in the 700 to 1200 nanometer range for activating said peroxide solution; and substantially suppressing optical energy in the 500 to 700 nanometer range from reaching the teeth under treatment.
Claim 2
Independent Claim
99 words
A method for treating discolored teeth comprising the steps of: applying a concentrated solution of peroxide to the pulp chamber of non-vital teeth and/or upon the surface of discolored teeth within the mouth of a dental patient; focusing a beam of optical energy directly upon each discolored tooth to be treated, with said beam containing ultraviolet energy in the 320 to 420 nanometer range in combination with infrared energy in the 700 to 1200 nanometer range for activating said peroxide solution; and substantially suppressing optical energy in the 500 to 700 nanometer range from reaching the teeth under treatment.
Claim 3
Dependent Claim
40 words
A method as defined in claim 1 wherein said beam of optical energy is generated from a light transmitting source of radiant energy through an optic light guide adapted to be held in close proximity to the tooth under treatment.
Claim 4
Dependent Claim
21 words
A method as defined in claim 2 wherein said light guide is held between 1-3 mm from the tooth under treatment.
Claim 5
Dependent Claim
31 words
A method as defined in claim 2 wherein said radiant source of light is a lamp selected from the group consisting of tungsten halogen, mercury vapor, short-arc xenon or metal halide.
Claim 6
Dependent Claim
39 words
A method as defined in claim 4 wherein said energy in the 500 to 700 nanometer range is suppressed by means of a band pass filter selected with a spectral distribution curve which attenuates energy in the aforementioned range.
Claim 7
Dependent Claim
29 words
A method as defined in claim 5 wherein said light guide is contoured at the distal end thereof to conform to the surface geometry of the tooth under treatment.
References Cited (Backward Citations)
US4445858A
Cited
US4615679A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-04-27 | 1990-10-27 | 1991-04-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-04-27 | 1994-10-27 | 1995-04-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-04-27 | 1998-10-27 | 1999-04-28 | $7700.00 | Window Closed / Lapsed |