How do Reused Glide Path Files Affect the Cyclic Fatigue Resistance?

The aim of this study was to compare the cyclic fatigue resistance (CFR) PathFile (Dentsply Sirona, Ballaigues, Switzerland) and ScoutRace (FKG Dentaire, La Chaux-de-Fonds, glide path files which were either new or previously used. Forty (PF) 19/.02 40 (SR) 20/.02 instruments used for study. Half in each group (PF-U SR-U) 3D demo tooth models creating paths, while other half (PF-N SR-N) directly subjected test. (n=80) rotated test device with an artificial stainless-steel canal (60° curvature, 5 mm radius 1.5 width 3.0 depth) under continuous irrigation distilled water at 37°C until fracture occurred. Time recorded Weibull reliability analysis performed. Data statistically analysed. Conformity normal distribution examined using Shapiro-Wilk A paired two-sample t-test TTF values according time within groups. showed better CFR than groups (P<0.05). PF higher SR both predicted %99 survival PF-N> SR-N>PF-U >SR-U. Reuse reduced files.