Incidence of three roots and/or four root canals in the permanent mandibular first molars in a tunisian sub-population: a radiographic CT study
Objectives: The purpose of this study was to evaluate the prevalence of three-rooted permanent mandibular first molars (PMFMs) with four canals and their morphological characteristics among a tunisian sub-population from using computed tomography scans (CTs).
Methods: Among the 160 CTs screened, 148 patients (aged between 10 and 78 years) possessing at least one PMFM were identified.
A total of 259 PMFMs were evaluated in axial section series and with multiplanar reconstructions to determine the number of roots and canals. The incidence of three-rooted PMFMs was compared with regard to gender.
Results: Among the 148 CTs of 92 females and 56 males, 1 female and 3 males were found to have at least one three-rooted PMFM. Among the 259 PMFMs, 4 PMFMs (1.54 %, 2 of 132 left and 2 of 127 right) were found to have three roots. The prevalence of distal root(s) with two canals was 85.33 % (221 of 259).
Conclusions: The occurrence of three-rooted PMFMs among a tunisian sub-population was 1.54 % and was inferior than other countries and ethnicities. Understanding the prevalence of PMFMs with a distolingual root and/or canal in a Tunisian population may be useful for successful endodontic treatments.