Plastic orthodontic appliance having improved bonding characteri

Details Plastic orthodontic appliance having improved bonding characteri Plastic orthodontic appliance having improved bonding characteri

1996-04-02

1998-11-03

Hirsch, Paul J.

Dentistry

Orthodontics

Bracket

433 8, A61C 716

Patent

active

058299726

ABSTRACT:
Plastic orthodontic appliances having improved bonding characteristics are described. The appliances have a polymeric base with projecting structure extending outwardly therefrom and an applied coating of a chemically activatable material. The projecting structure includes a broadened outer extremity and undercuts proximate the outer extremity which form mechanical bonds with a bonding adhesive. The chemically activatable material applied to the projecting structure increases the chemical bond between the structure and the bonding adhesive and thereby enhances the overall bonding characteristics of the appliance. Another aspect of the invention concerns a method of enhancing the bond strength of plastic orthodontic appliances. The method includes applying a chemically activatable material layer by sputtering, plasma deposition, or other deposition process, to a plastic orthodontic appliance having projecting structure. In a preferred embodiment, the projecting structure is a plurality of posts, and the chemically activatable coating is SiO.sub.2. It is further contemplated that the chemically activatable coating may be activated by treatment with silane.

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