ZAHNWURZELBEHANDLUNGSINSTRUMENT

摘要

A file A acting as a root canal treatment tool has a rod-shaped needle portion 1 that includes a working portion 4 of a predetermined length from a tip 3 and a shank 5 formed continuously to the working portion 4 and is composed of Ni-Ti alloy, wherein at a part of the working portion or the entire working portion is subjected to heat treatment paying attention to durability to rotation fatigue.