Effect of different torque settings selected during instrumentation on fracture strength of endodontically treated teeth

Background: The study evaluated the effect of root canal instrumentation at low and high torque settings on fracture strength endodontically treated teeth. 
 Methods: Ninety extracted single-rooted human mandibular incisors were randomly divided into one control (CG) two experimental groups (n=30): no or filling (CG), with ProTaper Universal files settings, settings. Root was performed an epoxy resin-based sealer gutta-percha using a single-cone technique in groups. Each specimen tested for strength. analysis variance Tukey test used to analyze obtained data. significance level set 0.05. Results: Statistically significant differences observed between (p = 0.001). While difference CG not > 0.05), torque, < 0.05). Conclusion: According this results, since lowest value group, clinicians may be advised choose recommended by manufacturers rotary systems.