Orthodontic coil spring

Details Orthodontic coil spring Orthodontic coil spring

A - Human Necessities

61

C

83/1, 140/10

A61C 7/30 (2006.01) A61C 7/00 (2006.01) A61C 7/12 (2006.01) B21F 3/02 (2006.01)

Patent

CA 2017537

Abstract of the Disclosure A continuous-length orthodontic coil spring is made from a shape-memory alloy wire wound into a coil. The coil defines a plurality of open coil sections defining spaces between the turns thereof, and closed coil sections formed between the open coil sections. The closed coil sections are tightly wound with insubstantial spacing between the turns thereof. The coil spring is made of a Ni-Ti alloy wire, and is heat treated to impart a predetermined range of spring force within a superelastic zone of deflection. The continuous-length coil spring is cut through the closed coil sections to form several shorter-length coil springs therefrom. The closed coil sections on either end of the shorter- length coil springs are thus adapted to engage the orthodontic brackets mounted to a patient's teeth, to accurately impart the force of the spring to the brackets.

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