Shape memory orthodontic archwire having variable recovery stresses

摘要

Orthodontic archwires and methods of making such archwires. The archwire includes a shape memory alloy having a preset shape for exerting forces on teeth during orthodontic treatment. The alloy, which preferably is comprised of at least three elements (e.g., Ni, Ti and Cu), has a transformation temperature (A.sub.f) greater than about 25° C., whereby the orthodontic archwire produces forces at normal mouth temperature which are greater than the forces produced at normal room temperature. The orthodontic archwire also preferably has a variable modulus of elasticity.