Influence of rotational speed and glide path on cyclic fatigue resistance of XP-endo shaper

Abstract

Aim: The aim of this study was to evaluate the effect of the different rotational speeds and creating a glide path on cyclic fatigue resistance of XP-endo Shaper (R) (XPS) (FKG Dentaire SA, La Chaux-de-Fonds, Switzerland) at intracanal temperature. Materials and Methods: Ninety-six XPS files were divided into 6 groups [directly used at 1000 rpm (G1) or 3000 rpm (G4), with glide path at 1000 rpm (G2) or 3000 rpm (G4), without glide path at 1000 rpm (G3) and 3000 rpm (G6)]. All the instruments were rotated in a stainless-steel artificial canal with a 75 degrees angle of curvature, 7.5 mm radius of curvature, and 1.3 mm inner diameter until the fracture occurred. The number of cycles to failure (NCF) and the length of the fractured (LF) segments were evaluated. Weibull analysis, one-way ANOVA, and Tukey multiple comparison tests were performed with the significance level set at 0.05. Results: NCF of 3000 rpm groups was statistically higher than that of 1000 rpm groups (P < 0.05). And time to fracture was found statistically higher in 1000 rpm as compared to 3000 rpm. The mean LF of the instruments was statistically insignificant (P > 0.05). There was no statistical difference within the groups subjected at 1000 rpm and 3000 rpm files used with or without a glide path (P > 0.05).Conclusion: Within the limitations of this in vitro study, it was determined that XPS can be used safely even at 3000 rpm speed with or without glide path.