Evaluation of Root Canal Morphology of Mandibular Premolars with Cone Beam Computed Tomography in Rafsanjan During 2022

Complications in the anatomy of the root canal system are considered one of the main limitations during endo treatment. Considering the effect of ethnicity and race on the shape and number of root canals, this study was conducted to determine the anatomy of the root canal in mandibular premolar teeth using CBCT in Rafsanjan city, In this descriptive-cross-sectional study, 186 CBCT radiographs of patients who visited an oral and maxillofacial radiology clinic were examined. After preparing the graphs using Romexis 3.8.3.or software, The number of roots and canals of the first and second premolars of the mandible and also the type of canals were evaluated in the axial and sagittal images. Vertucci's classification was used to examine root morphology. The fisher’s exact test was used and the significance level in the tests was considered 0.05. In terms of canal type observed in premolar teeth, 180 (88.2%) type one , 7 (3.4%) type three canal , 1 (0.5%) type four, 9 (4.4%) had type five , 1 (0.5%) had type six and 6 (2.9%) had type seven . Also, in second premolar teeth, 109 (98.2%) had type one 1 (0.9%) type three and 1 (0.9%) type five canal teeth. It should be noted that in none of the studied stereotypes, channels with type 2 and 8 were not found. In the Iranian race, the prevalence of two roots in the first and second premolars of the mandible was significantly higher in females than in males