Cyclic fatigue resistances of several nickel‐titanium glide path rotary and reciprocating instruments at body temperature

• Published in: International endodontic journal 2018-08, Vol.51 (8), p.924-930
• Main Authors: Yılmaz, K., Uslu, G., Gündoğar, M., Özyürek, T., Grande, N. M., Plotino, G.
• Format: Article
• Language: English
• Subjects: Alloys; Body Temperature; cyclic fatigue; Data processing; Dental Instruments; Dentistry; Endodontics; Fractures; HyFlex EDM; Nickel; One G; ProGlider; Rotation; R‐Pilot
• ISSN: 0143-2885; 1365-2591
• DOI: 10.1111/iej.12901

Aim To compare the cyclic fatigue resistance of the One G, ProGlider, HyFlex EDM and R‐Pilot glide path NiTi files at body temperature. Methodology Twenty One G (size 14, .03 taper), 20 ProGlider (size 16, .02 taper), 20 HyFlex EDM (size 10, .05 taper) and 20 R‐Pilot (size 12.5, .04 taper) instruments were operated in rotation at 300 rpm (One G, ProGlider and HyFlex) or in reciprocation (R‐Pilot) at 35 °C in artificial canals that were manufactured by reproducing the size and taper of the instrument until fracture occurred. The time to fracture was recorded in seconds using a digital chronometer, and the length of the fractured fragments was registered. Mean data were analysed statistically using the Kruskal–Wallis test and post hoc Tukey tests via SPSS 21.0 software. The statistical significance level was set at 5%. Results The cyclic fatigue resistance of the R‐Pilot files was significantly greater than the other instruments, and the One G was significantly lower (P  0.05). No significant difference (P > 0.05) was evident in the mean length of the fractured fragments of the various instruments. Conclusions The cyclic fatigue resistance of the R‐Pilot reciprocating glide path file was significantly greater than that of the rotary HyFlex EDM, ProGlider and One G glide path files.