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ENDO - Endodontic Practice Today

Edited by Bun San Chong and Edgar Schäfer

Official Publication of the Belgian Association for Endodontology and Traumatology (BAET) and the French Society of Endodontics (SFE)

ISSN (print) 1753-2809 • ISSN (online) 1753-2817


Winter 2020
Volume 14 , Issue 4

Pages: 297–304
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Evaluation of the cyclic fatigue resistance of 2Shape, ProTaper Gold and Vortex Blue rotary NiTi files in curved canals: a comparative in vitro study

Sarah Isaac El Mankabadi, Geraldine Mohamed Ahmed, Heba Ahmed ElAsfouri

Aim: To compare the cyclic fatigue resistance of three thermomechanically treated rotary nickeltitanium instruments, 2Shape (TS; Micro-Mega, Besancon, France), ProTaper Gold (PTG; Dentsply Maillefer, Baillagues, Switzerland) and Vortex Blue (VB; Dentsply Tulsa Dental Specialties, Tulsa, OK, USA), under intracanal conditions. Materials and methods: A total of 36 rotary nickel-titanium instruments of (12 TS [25/0.06]; 12 PTG [25/0.08]; 12 VB [25/0.06]) were rotated in a custom-made model with a 60-degree angle of curvature and 5-mm radius of curvature until fracture occurred. The model was immersed in an acrylic resin container filled with 2.5% sodium hypochlorite (NaOCl) solution set at intracanal temperature (35°C ± 2°C). Time to fracture was recorded, then the number of cycles to failure was calculated. The length of the fractured segments was measured using a digital caliper and scanning electron microscopy was also performed. The data were statistically analysed using a Kruskal-Wallis and Dunn test with the significance level set at P ≤ 0.05. Results: The PTG group showed the highest statistically significant number of cycles to failure followed by the VB and TS groups, respectively (P ≤ 0.001). Both the PTG and TS groups exhibited no statistically significant difference regarding the length of the fractured segments (P ≥ 0.05); however, they had statistically significant longer fragments compared to the VB group (P ≤ 0.007). Scanning electron microscopy analysis revealed typical features of cyclic fatigue failure. Conclusions: The PTG system had the highest cyclic fatigue resistance followed by the VB system. The T-wire technology of the TS system showed the lowest resistance to cyclic fatigue.

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