We found a match
Your institution may have access to this item. Find your institution then sign in to continue.
- Title
Cyclic and torsional fatigue resistance of four rotary NiTi instruments with similar cross-sectional design and different thermal treatments.
- Authors
Espinosa KLYMUS, Michel; Priori ALCALDE, Murilo; Ricci VIVAN, Rodrigo; Carvalho de VASCONCELOS, Bruno; Reis SÓ, Marcus Vinícius; Hungaro DUARTE, Marco Antonio
- Abstract
Objective: The aim of this study was to evaluate the cyclic and torsional fatigue resistance of Nickel-Titanium rotary instruments with similar cross-sectional design and manufactured by different thermal treatments: Hyflex CM (HCM 25/.06) Vortex Blue (VB 25/.06), Sequence Rotary File (SRF 25/.06) and EdgeSequel (EDF 25/.06) (n=20). Material and Methods: Cyclic fatigue test evaluated the time and number of cycles to failure (NCF) in an artificial stainless steel canal with 60° and 5-mm radius of curvature (n=10). The torsional test (ISO 3630-1) evaluated he maximum torque and distortion angle to failure at 3 mm from the tip (n=10). After the torsional and cyclic fatigue test the instruments were evaluated by scanning electron microscope (SEM). Data were analyzed using one-way ANOVA and Tukey tests, and the level of significance was set at 5%. Results: The HCM presented the longest time and highest NCF to fatigue than all the groups (P<0.05). The SRF presented similar time (P>0.05) and lower NCF (P<0.05) to fatigue than VB. Regarding to the torsional test, HCM presented the lowest torque load and the highest distortion angle of all the groups (P<0.05). No significant difference was found among VB, SRF and EDF regarding the distortion angle (P>0.05). Conclusion: The HCM presented the highest cyclic fatigue resistance and distortion angle to failure. However, the VB showed higher torsional load to failure.
- Subjects
ELECTRICITE de France SA; CYCLIC fatigue; TORSIONAL load; NICKEL-titanium alloys; SCANNING electron microscopes; ONE-way analysis of variance
- Publication
Dental Press Endodontics, 2021, Vol 11, Issue 1, p63
- ISSN
2178-3713
- Publication type
Article
- DOI
10.14436/2358-2545.11.1.063-071.oar