ULTRA-FINE GRAIN NICKEL-TITANIUM ALLOY ROOT CANAL FILE AND PREPARATION METHOD THEREFOR

摘要

Disclosed are an ultra-fine grain nickel-titanium alloy root canal file and a preparation method therefor. The ultra-fine grain nickel-titanium alloy root canal file is made of an ultra-fine grain nickel-titanium alloy having a particle size of 200 nm to 300 nm. The preparation method therefor comprises: 1, ultra-fine grain treatment on a nickel-titanium alloy; 2, preparation of an ultra-fine grain nickel-titanium alloy wire; 3, machining and surface treatment on a root canal file cutting edge; and 4, heat treatment on an ultra-fine grain nickel-titanium alloy root canal file. The ultra-fine grain nickel-titanium alloy root canal file is in martensite and austenite phases at room temperature, and a diffraction peak broadens obviously due to grain refinement; however, the ultra-fine grain nickel-titanium alloy root canal file is in austenite phase at usage temperature. The ultra-fine grain nickel-titanium alloy root canal file solves technical problems that the existing nickel-titanium root canal file is low in cutting efficiency and prone to bending and intra-root-canal fracture. Compared with the existing nickel-titanium root canal file, the ultra-fine grain nickel-titanium alloy root canal file has good hardness and good wear resistance, and significantly increases cutting efficiency in clinical use.