The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 28, 1992
Filed:
Sep. 30, 1991
Lee H Tuneberg, Sheboygan, WI (US);
American Orthodontics Corporation, Sheboygan, WI (US);
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.