Department of Operative Dentistry, Aga Khan University Hospital, Karachi, Pakistan.
Section of Dentistry, Department of Surgery, Aga Khan University Hospital Karachi, Pakistan.
J Pak Med Assoc. 2022 Oct;72(10):1963-1967. doi: 10.47391/JPMA.3358.
To radiographically determine the mental foramen position, its distance to the nearest apex and the prevalence of anterior loop of mandibular nerve using cone-beam computed tomography scans.
The cross-sectional study was conducted at the Aga Khan University Hospital, Karachi, from January to June 2020, and comprised cone-beam computed tomography scans of males or females of Pakistani origin aged 15-65 years with intact mandibular dentition and fully formed roots with matured apex. The scans were analysed to determine the horizontal position of mental foramen and to classify it according to the Tebo and Telford classification. The vertical distance from mental foramen to the nearest tooth apex was measured and the mandibular nerve configuration was determined. Data was analysed using SPSS 23.
Among the 96 scans, the most frequent location of mental foramen MF was along the long axis of 2nd premolars for both right 50(52.1%) and left 49(51%) sides, followed by between 1st and 2nd premolars for both right 28(29.2%) and left 38(39.6%) sides. The mean minimum distance from mental foramen to the nearest root apex was 3.75±2.59mm and 3.99±2.26mm on right and left sides, respectively. There was bilateral symmetry on both sides. The most frequent mandibular nerve configuration on the right 69(72.6%) and left 75(78.1%) sides, with anterior loop being the least common; right side 3(3.2%) and 5(5.2%) left side.
The most common position of mental foramen was along the long axis of 2nd premolars while the anterior loop was the least common.
使用锥形束计算机断层扫描（CBCT）来确定颏孔的位置、其到最近根尖的距离以及下颌神经前支环的发生率。
本横断面研究于 2020 年 1 月至 6 月在卡拉奇的 Aga Khan 大学医院进行，纳入了来自巴基斯坦的 15-65 岁、具有完整下颌牙列和完全形成的根尖的男性或女性的 CBCT 扫描。对扫描结果进行分析，以确定颏孔的水平位置，并根据 Tebo 和 Telford 分类进行分类。测量颏孔到最近牙根尖的垂直距离，并确定下颌神经的形态。使用 SPSS 23 对数据进行分析。
在 96 个扫描中，右侧 50 个（52.1%）和左侧 49 个（51%）的颏孔最常见的位置位于第二前磨牙的长轴上，其次是右侧 28 个（29.2%）和左侧 38 个（39.6%）的第一前磨牙和第二前磨牙之间。颏孔到最近根尖的最小距离平均值分别为右侧 3.75±2.59mm 和左侧 3.99±2.26mm。两侧均存在双侧对称性。右侧 69 个（72.6%）和左侧 75 个（78.1%）的最常见下颌神经形态为前支环，最少见的是右侧 3 个（3.2%）和左侧 5 个（5.2%）。
颏孔最常见的位置是沿着第二前磨牙的长轴，而前支环是最不常见的。
