WANG Min,DU Yu,LIU Guo, et al. Cone beam CT study of root anatomy and root canal morphology in mandibular premolars[J]. JOURNAL OF WEZHOU MEDICAL UNIVERSITY, 2020, 50(8): 670-673.
Abstract：Objective: To investigate the root anatomy and root canal morphology of mandibular premolars using Cone Beam CT and to determine their degree of bilateral symmetry. Methods: CBCT images of 413 patients were included (794 mandibular first premolars and 770 mandibular second premolars). The images were analyzed using NNTViewer software to check for the number of roots, the location of radicular grooves, the number of root canals, the canal configurations, and the bilateral symmetry of root canals. Results: The majority of the mandibular first premolars were single-rooted, only 13 teeth were double-rooted. The canal configuration of mandibular first premolars was type I: 87.66%, type II: 1.76%, type III: 2.52%, type IV: 2.14%, type V: 5.92%, and C-shaped canal: 12.21% (according to the cross-section), respectively. 118 mandibular first premolars had radicular grooves, which were all located on the mesio-lingual side. The bilateral symmetry rate of canal configuration was 93.70%. All the mandibular second premolars were single-rooted. 99.48% of root canals were type I and 0.52% were type V. Four mandibular second premolars had radicular grooves on the mesiolingual side. 99.48% of mandibular second premolars exhibited bilateral canal symmetry. Conclusion: The root anatomy and root canal morphology of mandibular premolars are complex but symmetrical. CBCT aids in characterizing the the configurations of the canal system, which can improve the success rate of root canal treatment.
