Patent ID: 8714976
Filing Date: 2014-05-06
Classification: A61C,B21K,C21D,C22C,C22F,Y10T

Abstract:
1. An endodontic instrument comprising: a working portion composed of a nickel-titanium alloy and configured for use in the human body, the working portion having an austenite finish temperature in the range of 40 to 60° C. and being in a deformed monoclinic martensitic state and having, after a 90° bend and release, a shape memory in a range of 60 to 75 percent of the 90° bend, wherein the austenite finish temperature, the deformed monoclinic state, and the shape memory restoration are a result of a final thermal heat treat of the working portion before machining while the nickel-titanium alloy is under constant strain and a finished instrument thermal heat treat of the working portion after machining.