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    Root Canal Morphology of Mandibular First and Second Premolars Using Cone-Beam Computed Tomography in A Selected Turkish-Population and Literature Review
    (Selçuk Üniversitesi, 2022) Ezentaş, Nilay; Özyürek, Emel Uzunoglu
    Background: To investigate the root canal anatomy (RCA) of permanent mandibular premolars using cone-beam computed tomography (CBCT) in a group of population and to review previous studies regarding other Turkish subpopulations. Methods: The sample for this retrospective study included 1048 CBCT images of 672 females and 376 males representing 1613 mandibular first and 1461 second premolars. Pubmed and Google Scholar were used to search previous literature with selected keywords. Results: The incidence of single root in mandibular first and second premolars was 99.75% and 99.38%, respectively. Complex RCA was evident in the first premolars compared to second premolars and in males than females (P < 0.05). According to the results of this study, 17.82% of male patients (n = 67) and 12.5% of female patients (n = 84) had at least 1 mandibular premolar with 2 or more root canals (P < 0.05). Eight studies had previously evaluated the RCA of mandibular premolars of other Turkish subpopulations by clearing or CBCT images. The prevalence of 2 or more root canals was found between 5.8-39.5% in mandibular first premolars and 1.1-29% in mandibular second premolars in these studies. Conclusion: More attention should be paid to the detection of additional canals during root canal treatment of mandibular premolars, especially in male patients. The symmetrical morphology of the premolars may guide the practitioners during the root canal treatment. Evaluation methods could affect the results regarding RCA.