Dental canal prevalence in bifid mandibular canals was found as 8.3% in Orhan K et al. study, as14.9% in Zhang Y et al. study and as 18.8% in Rashsuren O et al. study[5,6,3]. It was found as 18.6% in current study. While 29 of the 39 dental canals found in our study ended at the third molar root, 10 was found to end at the second molar root. In this study in group B2 dental canal prevalence in bifid mandibular canals was accepted as 0 since there were no molars and only 2 dental types were found in mandibles with only third molars missing. Of the 132 bifid mandibular canals in group A dental type were found as 37 (28%)(table/fig 8). According to this result, it was thought that it would not be right to include mandibles with third and second molarsmissing while assessing dental canal frequency and it was accepted that the actual value would be 28% and this value was higher than the literature. Since no distinction was made about third molar and second molar absence in the population in studies conducted in the literature, the values they specified about dental canal prevalence was thought to be lower than the normal [3,5,6,14].The prevalence of forward canal among bifid mandibular canals was found as 4.1% in RashsurenO et al. study, as 13.7% in Zhang Y et al. study and as 29.8% in Orhan K et al. study[3,6,5]. In this study, forward canal prevalence was found as 30%. While 13 of the 63 forward canals
detected in our study were found to be confluence, 50 were found to be without confluence(table/fig 8).In previous study, Orhan K et al. found buccolingual type as 14.5%; Zhang Y et al. found buccolingual type as 0%, bicanal as 0.6%, trifid canal as 2.4% and Rashsuren O et al. found buccolingual type as 0% and trifid canal as 5.8%[5,6,3]. In this study, buccolingual type was found as 9%, while trifid canal was found as 5.2% and bicanal was found as 3.3%. While 7 of the19 buccolingual canals were in buccal, 12 were found in lingual.CBCT is a highly suitable method for the detection, confirmation and verification of bifid mandibular canals .It is important to notice the anatomy of the mandibular canal and its variations in order to prevent complications resulting from third molar extraction and implant surgery.LimitationLarger sample should be studied in new studies due to the small sample size in this study. Because of our study is retrospective, clinical studies with CBCT should be done for implant andthird molar surgery.ConclusionThe prevalence of bifid mandibular canal was found as 41.9% in this study conducted with CBCT. No difference was found between genders in terms of prevalence. Bifid mandibular canalprevalence was found to be higher in group A when compared with group B. Hence CBCT is a significantly useful tool for the exploration of bifid canals that uses less ionizing radiation rather than other 3D imaging systems.