Abstract:

Purpose: The purpose of this study is to compare the WaveOne (Dentsply Maillefer, Ballaigues, Switzerland), Reciproc (VDW, Munich, Germany) and Twisted File Adaptive (Axis/SybronEndo, Orange, CA, USA) rotating system nikel titanium (Ni-Ti) curves with twisted (S-shaped) channels with cyclic fatigue-related breakdown resistance. Tool and Method: In this study, 45 curves (WaveOne primary, Reciproc R25 and Twisted File Adaptive M-L1) were used. Each system was twisted in a double curved (S-shaped) artificial channel until it was broken to 15 curves. The number of rounds until the broken was calculated and the length of the broken pieces was recorded. The data was statistically analyzed using ANOVA and Tukey post-host tests. The statistical significance level was determined as p < 0.05. Results: Reciproc R25 curves were found more resistant to cyclic fatigue in both apical and coral curvature, compared to the WaveOne primary and Twisted File Adaptive M-L1 curves (p < 0.05). There is no statistically significant difference between the WaveOne primary and Twisted File Adaptive M-L1 curves in both curvatures (p > 0.05). The length of the broken fragments of the tools among all groups was statistically similar (p > 0.05). The result: Reciproc R25 curves were found more resistant to breakdown in double curved channels than the WaveOne primary and Twisted File Adaptive curves. Keywords: Circular fatigue, Reciproc, WaveOne, S-shaped cane COMPARISON OF THE CYCLIC FATIGUE RESISTANCE OF WAVEONE, RECIPROC AND TWISTED FILE ADAPTIVE FILES IN CANALS WITH A DOUBLE CURVATURE (S-SHAPED) ABSTRACT Aim: The purpose of this study was to compare the cyclic fatigue resistance of WaveOne (Dentsply Maillefer, Ballaigues, Switzerland), Reciproc (VDW, Munich, Germany) and Twisted File Adaptive (Axis/SybronEndo, Orange, CA, USA) titanium (Ni-Ti) systems in a double curvature. Materials and Methods: Forty five rotary NiTi files (WaveOne primary, Reciproc R25 and Twisted File Adaptive M-L1) were used in this study. Fifteen files from each system were rotated in channels with a double curvature until fracture. The number of cycles to fracture was calculated and the length of each fractured fragment was recorded. The data were statistically analyzed using ANOVA and Tukey post hoc tests. The statistical significance level was set at p < 0.05. Results: The Reciproc R25 file had higher cyclic fatigue resistance than WaveOne primary and Twisted File Adaptive in the apical and coronal curvatures (p < 0.05). There was no significant distinction in the cyclic fatigue resistance of the WaveOne primary and Twisted File Adaptive files in either the apical or coronal curvature. The length of the fractured part of the instruments was similar among all the groups (p > 0.05). Conclusion: The Reciproc R25 file indicated better cyclic fatigue resistance than WaveOne primary and Twisted File Adaptive in an artificial channel with an S-shape. Keywords: Cyclic fatigue, Reciproc, WaveOne, S-shaped channel.

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