An initial investigation of the bending and torsional properties of Nitinol root canal files. The cyclic fatigue resistance of both Genius files was higher than that of WaveOne Gold Primary.ĭental Instruments Endodontics Root Canal PreparationĮndodontic instruments manufactured with nickel-titanium (NiTi) were introduced by Walia et al. Within the limitations of this in vitro study, EdgeFile X1 instruments had significantly higher cyclic fatigue resistance than did Genius and WaveOne Gold Primary instruments. EdgeFile exhibited the highest cyclic fatigue resistance, followed by both Genius files (p <. The fractured surfaces of five instruments from each brand were randomly examined and microphotographed by a low-vacuum environmental scanning electron microscopy – SEM (Tabletop Microscope TM3030, Hitachi, Japan) to confirm the cyclic fatigue fracture. 05) using SigmaPlot software (Systat software, CA, USA). The mean and standard deviations of NCF and TF were calculated for each reciprocating system and the data were subjected to Kruskal-Wallis one-way analysis of variance and to Dunn's test (p <. The number of cycles to failure (NCF) was calculated and time to fracture (TF) was recorded in seconds using a digital chronometer. All instruments were operated in reciprocation mode until fracture occurred. Twenty Genius (Ultradent) 25.04, 20 Genius 30.04, 20 EdgeFile X1 (EdgeEndo) and 20 WaveOne Gold Primary (Dentsply Maillefer) instruments were included in this study and tested in a static cyclic fatigue testing device, which has an artificial stainless steel canal with a 60° angle of curvature and a 5-mm radius of curvature. This study aimed to assess the cyclic fatigue resistance of Genius and EdgeFile X1 reciprocating instruments compared with WaveOne Gold Primary.
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