Root Dentine Thickness and Concavity Depth in Mandibular Molars: A Cone Beam Computed Tomography Population Study

Abstract

Objective: The purposes of the present study were to evaluate dentine thickness and concavity depth belowthe furcation level of the mesial canals of the mandibular first and second molars, to examine differencesbetween gender, age, and quadrant, and to prove if there is a relationship between root length and dentinethickness.Methods: Two hundred eleven mandibular first and second molars were included in this study. Sampleswere divided according to age, gender, quadrant, and root length. Measurements of dentine thickness fromthe external border of the root canal to the external root surface and concavity depth were recorded 1, 2, and4 mm below the furcation level. Kruskal–Wallis and Wilcoxon rank sum tests were performed to estimate theinfluence of different variables, and a multiple regression analysis was performed to evaluate the influence ofdentine thickness below the furcation level.Results: First molars had a deeper concavity depth with significant differences in both 1 mm and 2 mm levels than second molars (P0.05). The distal concavity was significantly deeper in the 1 and 2 mm levels (P