Department of Endodontics, Ribeirão Preto Dental School, University of São Paulo, Ribeirão Preto, SP, Brazil.
Braz Dent J. 2022 Sep-Oct;33(5):1-8. doi: 10.1590/0103-6440202205105.
This study aimed to analyze the root and root canal morphology of mandibular first and second molars using CBCT images. A total of 2,400 mandibular molars exams were selected from 600 patients aged between 18 and 75 years. The number of roots, number of root canals, and root canal configuration according to the Vertucci classification were verified. Overall, 94.92% of mandibular first molars and 90.17% of mandibular second molars had two separate roots. Among the biradicular molars, the first molars showed a greater incidence of type IV canals in the mesial root and type I in the distal root. In the second molars, the most common canal form was type IV in the mesial root and type I in the distal root. In the triradicular molars, the type IV and type I configurations were the most common in the mesial root of the first molar and second molar, respectively. In both triradicular molars, there was a prevalence of type I canal in the distal and DL roots. Statistical analysis was performed at a significance level of 0.05. The number of roots was correlated with gender (Spearman test), and the canal's configuration with gender and bilaterality (Wilcoxon test). The subpopulation studied has a high incidence of bilateral symmetry and mandibular molars with two roots with two distinct mesial canals and one distal canal. The bilateral configuration is possible to estimate the number of canals, especially in images that are difficult to visualize, such as atresic canals.
本研究旨在通过 CBCT 图像分析下颌第一和第二磨牙的根管和根形态。从 600 名年龄在 18 至 75 岁的患者中选择了 2400 个下颌磨牙检查。验证了根的数量、根管的数量和根据 Vertucci 分类的根管形态。总体而言，94.92%的下颌第一磨牙和 90.17%的下颌第二磨牙有两个独立的根。在双根磨牙中，近中根的第四型和远中根的第一型发生率更高。在第二磨牙中，最常见的根管形态是近中根的第四型和远中根的第一型。在三根磨牙中，近中根的第四型和第一型是第一磨牙和第二磨牙最常见的根管形态。在两个三根磨牙中，远中根和 DL 根都有第一型根管的发生率。在 0.05 的显著性水平上进行了统计分析。根的数量与性别相关（Spearman 检验），根管形态与性别和双侧性相关（Wilcoxon 检验）。所研究的人群具有双侧对称性和下颌磨牙具有两个根的高发率，每个根有两个明显的近中根管和一个远中根管。双侧形态有助于估计根管的数量，尤其是在难以可视化的图像中，如闭锁根管。
