Anatomic Features of C-shaped Mandibular Second Molars in a Selected Iranian Population Using CBCT.

INTRODUCTION: The aim of this retrospective study was to analyze the frequency of C-shaped root canal configuration and characterize mandibular root canal morphology using cone-beam computed tomography (CBCT) with 3D images in an Iranian population. METHODS AND MATERIALS: squared test and Fisher's exact test in SPSS 17. The significance level was set at 0.05. RESULTS: =0.86, respectively). Only 4 teeth (4.9%) had the same root canal configuration from the orifice to the apex. In the remainder of the teeth, the cross-sectional root canal configuration changed at different levels of the root. CONCLUSION: There were significant variations in the number of roots and canal morphology in mandibular second molars, which should be considered during debridement and obturation of the root canal system.