Issue V10N02 | Year 2020 | Editorial Original Article | Pages 60 to 66
Introduction: The aim of this study was to evaluate the cyclic and torsional fatigue resistance of reciprocating single-file systems W File 25.07 (WF, TDKaFile, Mexico City, Mexico) and X1 Blue File 25.06 (X1 BF, MK Life, Porto Alegre, Brazil) at body temperature. Materials and Methods: Forty reciprocating instruments of the W File 25.07 (WF 25.07) and X1 BF 25.06 (n=20) were used. Cyclic fatigue tests were performed at body temperature (36° ± 1°C). The instruments were reciprocated until fracture occurred in an artificial stainless steel canal with a 600 angle and a 5-mm radius of curvature (n=10). The torsional test evaluated the torque and angle of rotation at failure of new instruments (n=10) in the portion 3 mm from the tip according to ISO 3630-1. The fractured surface of each fragment was observed by using scanning electron microscopy (SEM). Data were analyzed using one-way ANOVA and Tukey tests, and the level of significance was set at 5%. Results: X1 BF 25.06 had significantly higher time and NCF to failure than WF 25.07 (P<0.05). The torsional test showed that WF 25.07 had significantly greater torsional strength (p<0.05). In relation to angular rotation, the X1 BF 25.06 showed higher angular rotation values to failure than WF 25.07 (p<0.05). Conclusion: The X1 BF 25.06 had the highest cyclic fatigue resistance and highest angular rotation values to fracture in comparison with WF 25.07. However, WF 25.07 showed higher torsional resistance to fracture than X1 BF 25.06. Endodontics. Dental Instruments. Nickel. Titanium Metallicum.
Calefi PHS, Osaki RB, Evedove NFD, Cruz VM, Andrade FB, Alcalde MP. Cyclic and torcional fatigue resistance of W File and X1 Blue file reciprocating instruments. Dental Press Endod. 2020 May-Aug;10(2):60-6.