Abstract：
OBJECTIVE: To identify and measure the distance from the dental apices to the mandibular (MC) and mandibular incisive (MIC) canals, the diameter of the MC and the distances of the mental foramen (MF).
METHODS: In this retrospective study, cone-beam computed tomography scans of 144 adult patients (males and females) from a dental school in South Brazil were evaluated. Cross-sections were selected on the MC and the MIC paths, perpendicular to the mandibular base, and measurements were taken from the dental apices to the mandibular cortices. The measurement and location of the mandibular and mental foramen on both sides were compared. Paired t-tests compared sides, while Student\'s t-tests compared sexes (P < 0.05).
RESULTS: The distance from the dental apices to the upper wall of the MC was closest in the third molar and farthest in the central incisor region. In both sexes and sides, the path of the MC is in most cases lingually in the molar regions and moves to the buccal region from the second premolar. The MF emerges in the regions between the premolars or near the second premolar.
CONCLUSIONS: The results of this study highlight the importance of evaluating specific individual characteristics of a given population.
METHODS: In this retrospective study, cone-beam computed tomography scans of 144 adult patients (males and females) from a dental school in South Brazil were evaluated. Cross-sections were selected on the MC and the MIC paths, perpendicular to the mandibular base, and measurements were taken from the dental apices to the mandibular cortices. The measurement and location of the mandibular and mental foramen on both sides were compared. Paired t-tests compared sides, while Student\'s t-tests compared sexes (P < 0.05).
RESULTS: The distance from the dental apices to the upper wall of the MC was closest in the third molar and farthest in the central incisor region. In both sexes and sides, the path of the MC is in most cases lingually in the molar regions and moves to the buccal region from the second premolar. The MF emerges in the regions between the premolars or near the second premolar.
CONCLUSIONS: The results of this study highlight the importance of evaluating specific individual characteristics of a given population.
摘要：
目的：为了识别和测量从牙尖到下颌（MC）和下颌切角（MIC）的距离，MC的直径和精神孔（MF）的距离。
方法：在这项回顾性研究中，对巴西南部一所牙科学校的144名成年患者(男性和女性)的锥形束计算机断层扫描进行了评估。在MC和MIC路径上选择横截面，垂直于下颌基部，并从牙尖到下颌皮质进行测量。比较两侧下颌和精神孔的测量和位置。配对t检验比较双方，而学生t检验与性别比较(P<0.05)。
结果：从牙尖到MC上壁的距离在第三磨牙中最近，在中切牙区域最远。在性别和双方，在大多数情况下，MC的路径是舌状的磨牙区域，并从第二前磨牙移动到颊区域。MF出现在前磨牙之间或第二前磨牙附近的区域中。
结论：这项研究的结果突出了评估特定人群的特定个体特征的重要性。
方法：在这项回顾性研究中，对巴西南部一所牙科学校的144名成年患者(男性和女性)的锥形束计算机断层扫描进行了评估。在MC和MIC路径上选择横截面，垂直于下颌基部，并从牙尖到下颌皮质进行测量。比较两侧下颌和精神孔的测量和位置。配对t检验比较双方，而学生t检验与性别比较(P<0.05)。
结果：从牙尖到MC上壁的距离在第三磨牙中最近，在中切牙区域最远。在性别和双方，在大多数情况下，MC的路径是舌状的磨牙区域，并从第二前磨牙移动到颊区域。MF出现在前磨牙之间或第二前磨牙附近的区域中。
结论：这项研究的结果突出了评估特定人群的特定个体特征的重要性。
