Effect of heat treatment on K3, K3XF and MTwo endodontic files

Abstract

Abstract. The purpose of this study was to evaluate the effect of heat treatment on the transformation temperatures of K3, K3XF and MTwo endodontic files. DSC was used to investigate the domains of transformation temperatures and how the transformation temperatures vary along the file. The files were analysed as received and subjected to heat treatment. X-ray diffraction analysis was also used to investigate the stress-induced martensite transformation on the files under flexion. The results show that heat treatment influences the transformation temperatures and that under flexion, the conditions and situations in which files present a stress-induced martensite transformation can be identified.

On the fatigue resistance of endodontic files subjected to electrochemical polishing and an autoclave’s sterilisation cycle

“…Moreover, from experimental results, it is possible to infer that the electrochemical polishing process was more effective for endodontic file ref. Beyond the better fatigue resistance discussed in the previous paragraphs, it is worth to say that it has been reported by some researchers that the application of appropriate heat treatments could improve the flexibility/ductility of Ni-Ti alloys and cause a release of crystal lattice defects that contribute to changes in the phase transformation temperatures between room temperature and the oral temperature (Yahata et al, 2009;Braz-Fernandes et al, 2015). In fact, the alloys herein presented are in the martensitic phase during clinical use, not showing neither superelastic nor SIM transformation behaviour (Shen et al, 2013).…”