Method of forming and bracket of nickel-chromium-beryllium based

Details Method of forming and bracket of nickel-chromium-beryllium based Method of forming and bracket of nickel-chromium-beryllium based

1992-03-02

1993-10-19

Wilson, John J.

Dentistry

Orthodontics

Bracket

291606, A61C 300

Patent

active

052540030

ABSTRACT:
A dental bracket is made from an alloy of nickel, beryllium and chromium. The alloy may be that designated by the trademark REXILLIUM III. A groove is disposed in one surface of the bracket to receive an arch wire. An opposite surface of the bracket is roughened to receive an adhesive which has properties of adhering to the bracket and to a patient's tooth. The bracket is formed by heating the alloy to the molten state, pouring the molten alloy into a mold with a cavity in the shape of the bracket and allowing the bracket to cool in air to room temperature. As the bracket cools, the beryllium oxide formed during the heating of the alloy is formed into dendrites. The surface receiving the adhesive is washed with an acid to remove the material in the space between the dendrites and thereby roughen the surface for the reception of the adhesive. The dental bracket is advantageous in that it is made from a single integral piece of material and in that it has properties of preventing tarnishing when scratched. This results from the oxidation of the beryllium oxide during the formation of the bracket and the migration of the beryllium oxide to the surface area where the scratch is located.

REFERENCES:
patent: 4592890 (1986-06-01), Burnett et al.
patent: 4673354 (1987-06-01), Culler
patent: 4978391 (1990-12-01), Jones
patent: 5011410 (1991-04-01), Culler et al.
S. A. Aquilino et al., "Tensile Fatigue Limits of Prosthodontic Adhesives", J Dent Res, Mar. 1991, pp. 208-210.
The Critical Role of Rexillium III in Acid-Etched Bridgework, Jeneric Gold Co.
Rexillium III paper on physical properties.

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