US4826430A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Adhesive primer for alumina brackets
Assignee: Johnson and Johnson Dental Care Co
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Filing: 1988-05-11
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Granted: 1989-05-02
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Expires: 2008-05-11
Abstract
Abstract The adhesive strength of alumina brackets to acrylic adhesive cements is enhanced by forming an essentially silica coating on the bonding surface of the bracket by the steps of coating said surface with an organosilicon compound such as a silane and then pyrolyzing the organosilicon coating to volatilize the organic components thereof to thereby leave an essentially silica coating.
Inventors
- 👤 Albert C. Chen
- 👤 Robert D. DeLuca
- 👤 Robin M. F. Jones
- 👤 Donald S. Mueller
- 👤 Mary S. Yeganeh
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 18:58
CPC Classifications
C; C04; C04B; C04B41/00; C04B41/80; C04B41/81; C04B41/85; C04B41/87; A; A61; A61C; A61C7/00; A61C7/12; A61C7/14; C04B41/45; C04B41/50; C04B41/5025; C04B41/5035
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
159 words
A method for applying an alumina orthodontic bracket to the tooth of a patient, said alumina orthodontic bracket comprising a base member including an alumina tooth contacting surface and a body member extending from said base member, said body member including a walls defining an archwire groove, which process comprises the steps of: (a) coating said alumina tooth contacting surface with a thin adherent coating comprising silica; (b) applying a silane coupling agent to said alumina tooth contacting surface having thereon a thin adherent coating comprising silica; and (c) bonding said bracket to the surface of a tooth with an acrylic cement, wherein said step (a) comprises the steps of: (d) coating said tooth contacting surface with an organosilicon compound; and (e) subjecting the product of step (d) to elevated temperature to pyrolyze the organic portion of said organosilicon compound to thereby produce an alumina orthodontic bracket having the alumina tooth contacting surface coated with a composition comprising silica.
Claim 2
Independent Claim
159 words
A method for applying an alumina orthodontic bracket to the tooth of a patient, said alumina orthodontic bracket comprising a base member including an alumina tooth contacting surface and a body member extending from said base member, said body member including a walls defining an archwire groove, which process comprises the steps of: (a) coating said alumina tooth contacting surface with a thin adherent coating comprising silica; (b) applying a silane coupling agent to said alumina tooth contacting surface having thereon a thin adherent coating comprising silica; and (c) bonding said bracket to the surface of a tooth with an acrylic cement, wherein said step (a) comprises the steps of: (d) coating said tooth contacting surface with an organosilicon compound; and (e) subjecting the product of step (d) to elevated temperature to pyrolyze the organic portion of said organosilicon compound to thereby produce an alumina orthodontic bracket having the alumina tooth contacting surface coated with a composition comprising silica.
Claim 3
Dependent Claim
10 words
The method of claim 1 wherein the silane is gamma-methacryloxypropyltrimethoxysilane.
Claim 4
Dependent Claim
10 words
The method of claim 2 wherein the silane is gamma-methacryloxypropyltrimethoxysilane.
Claim 5
Dependent Claim
14 words
The method of claim 1 wherein the alumina bracket is a crystalline alumina bracket.
Claim 6
Dependent Claim
12 words
The method of claim 4 wherein the organosilicon compound is a silane.
Claim 7
Dependent Claim
10 words
The method of claim 5 wherein the silane is gamma-methacryloxypropyltrimethoxysilane.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1992-05-01 | 1992-10-31 | 1993-05-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-05-01 | 1996-10-31 | 1997-05-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-05-01 | 2000-10-31 | 2001-05-02 | $7700.00 | Window Closed / Lapsed |