Dentistry – Orthodontics – Bracket
Patent
1991-09-30
1992-04-28
O'Connor, Cary E.
Dentistry
Orthodontics
Bracket
A61C 300
Patent
active
051082853
ABSTRACT:
A bonding base and method of making a base for a ceramic orthodontic bracket to provide mechanical retention between the bracket and the tooth so that the bracket may be debonded by the failure of the mechanical bond at the bracket/bond interface when the shear strength of the bond is exceeded. The bracket bonding base includes a glass frit fired to the tooth-attaching side of the bracket and a layer of textured aluminum oxide fired to the frit. The method of making the bonding base includes controlled preparation of a glass ceramic glaze (frit) to have a coefficient of thermal expansion slightly less than that of the bracket and application of the glaze to the bracket base. Thereafter, a proper firing sequence transforms the glaze into a sintered glass ceramic. A specially prepared textured substance is then applied to the sintered ceramic glaze and the bracket is again fired under controlled conditions in order to fuse the textured substance with the glaze.
REFERENCES:
patent: 4460336 (1984-07-01), Smith et al.
patent: 4752221 (1988-06-01), Idanson et al.
patent: 4838786 (1989-06-01), Reher et al.
patent: 4948366 (1990-08-01), Horn et al.
Ormco Corporation, "Gem Brackets", 1987.
Unitex Corporation, "Transcend Series 2000", 1990.
American Orthodontics Corporation
O'Connor Cary E.
Zickert Lloyd L.
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