Cyclic Fatigue of ProFile Vortex and Vortex Blue Nickel-Titanium Files in Single and Double Curvatures

Laboratory comparison of cyclic fatigue resistance of WaveOne Gold, Reciproc and WaveOne files in canals with a double curvature

“…All instruments tested in this study fractured in the apical curvature area. The explanation for this may be that the apical curvature was more abrupt than the coronal curvature, which is in agreement with previous studies evaluating cyclic fatigue resistance of various files in double curvature canals (Al-Sudani et al 2012, Duke et al 2015. Cheung et al (2011) determined that instruments with a triangular cross-sectional design possessed greater cyclic fatigue resistance than those with a square cross-sectional design.…”

Resistance to cyclic fatigue of PathFile, ScoutRaCe and ProGlider glide path files in an S‐shaped canal

“…, Duke et al . ). Additionally, this finding is compatible with previous studies demonstrating that the fatigue life of NiTi rotary files is significantly influenced by the angle and/or radius of the canal curvature (Inan et al .…”

“…There is limited information on the CFR of NiTi files used in S‐shaped canals (Duke et al . , Neelakantan et al . , Shen et al .…”

Evidence for Reduced Fatigue Resistance of Contemporary Rotary Instruments Exposed to Body Temperature

“…Different parameters have been used to evaluate the fracture resistance of endodontic instruments, such as angle and radius of curvature (6), single or double curvature (8), rotary speed (6), and geometry of the simulated canal (9). Furthermore, in the absence of an established testing norm, several experimental designs have been created, such as 3 rigid stainless steel pins in a pegboard (10,11), tempered steel rod and block assemblies (7,12), and slots in steel form blocks (9).…”

“…These methodologies allowed comparisons among instruments tested within each experimental design, and it was found recently that more martensitic alloys are more fatigue resistant than austenitic instruments (8,13,14). However, these tests were all conducted at room temperature, taking care not to generate measurable heat, which is believed to potentially change NiTi properties (15,16).…”