Effect of Heat Treatment on Cutting Efficiency of Ni-Ti Endodontic Rotary Instrument
Date Issued
2010
Date
2010
Author(s)
Tsai, Tsung-Yu
Abstract
Cutting efficiency and cyclic fatigue resistance are both important requirement of Ni-Ti endodontic rotary instruments. To improve cutting efficiency, there have been attempts to change shape as well as fabrication procedures or attempts to change the material property. It is well know that annealing can relieve residual stress by cold working and improve the material toughness and ductility. Furthermore it is also well know that cryogenic treatment can improve the wear-resistance, dimensional stability and usable life of tool steels. This study investigated the effect of heat treatment combines with cryogenic treatment on the cutting efficiency of Ni-Ti endodontic rotary instruments. We also found that the phase transition temperature, the stiffness and the hardness will be affected by the different heat treatments.
Finally, we found the cutting efficiency is not improvement when the heat treatment at 400℃ combines with cryogenic treatment, but it is improvement when the heat treatment at 600℃ combines with cryogenic treatment.
Subjects
Ni-Ti endodontic rotary instrument
Heat treatment
Cryogenic treatment
Cutting efficiency
Type
thesis
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