Abstract

The aim of this study is to comparatively evaluate the cyclic fatigue fracture resistance of single file system with that multiple rotary file system. Materials and method: Three nickel titanium rotary systems Neoendo Flex; Oricam, F360; Komet and One Curve; Micromega size #25 were used in this study. Ten files were used in each file system, which are 25 mm long and tested with cyclic fatigue. Each experimental file was coated with EDTA gel and was placed in endodomotor handpiece with rubber stopper. File was then rotated according to respective rpm and torque in two simulated artificial curved canals with different angles of curvature (45º and 60°) and 5-mm radius of curvature and simultaneously digital stop watch was started. The number of cycles to fracture (NCF) and time taken (in seconds) until the file fractured were recorded in seconds using cyclic fatigue testing device. The data were analyzed statistically using one-way ANOVA followed by Post hoc Tukey test with significance set at (p < 0.05). Results: Group 3; One Curve has highest mean and standard deviation of (2.892 ± 0.667), followed by Group 1; Neoendo Flex (2.321 ± 0.126) and Group 2; F360 (2.054 ± 0.048). Intergroup comparison showed statistically significant results. Conclusion: Within the limitations of this study, it can be concluded that One Curve showed high resistance to cyclic fatigue when used in curved canals.

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