Patent ID: 8727773
Filing Date: 2014-05-20
Classification: A61C,B21F,C22C,C22F,C23C,C25F,Y10T

Abstract:
1. A method for manufacturing or modifying an endodontic instrument for use in performing root canal therapy on a tooth, the method comprising: (a) providing an elongate shank having a cutting edge extending from a distal end of the shank along an axial length of the shank, the shank comprising a superelastic nickel titanium alloy, and (b) after step (a), heat-treating the entire shank at a temperature from 400° C. up to but not equal to the melting point of the superelastic nickel titanium alloy, wherein the heat treated shank has an angle greater than 10 degrees of permanent deformation after torque at 45 degrees of flexion when tested in accordance with ISO Standard 3630-1.