Aga Khan University Hospital, Karachi, Pakistan.
Department of Operative Dentistry, Aga Khan University Hospital, Karachi, Pakistan.
J Pak Med Assoc. 2023 Apr;73(4):771-775. doi: 10.47391/JPMA.4949.
To evaluate the position of the root apices of posterior teeth of mandible with inferior alveolar nerve canal and the cortical bone on cone beam computed tomography.
The retrospective study was conducted from September to October 2021 at the Aga Khan University Hospital, and comprised cone beam computed tomography scans between November 2017 and October 2021 scans of healthy individuals of either gender aged 18-71 years with healthy, untreated, mandibular posterior teeth bilaterally. Shortest distance from apices of the mandibular posterior teeth to the border of inferior alveolar nerve canal, and to the mandibular buccal cortex were measured on the scans. Data was analysed using SPSS 23.
Of the 106 scans, 55(52%) were males and 51(48%) were females. Of the 746 33teeth in the scans, 385(51.6%) were present in the scans of males and 361(48.4%) in those of the females. For all mandibular posterior teeth, the distances in females were shorter than males, but for the distance from root apices to the IAN canal, the difference between genders was significant for the roots of second premolar and second molar only on the left side (p≤0.05). Regarding the distance from the root apices to the buccal cortex, no significant difference was found between the genders, for each type of tooth, (p>0.05). Correlations between the distance from apex to inferior alveolar nerve (r<0.30) and between age and apex to buccal cortex distance (r<0.28) were weak.
Procedures planned apical to second premolar and second molar teeth can potentially damage the inferior alveolar nerve.
通过锥形束 CT 评估下颌后牙牙根尖与下牙槽神经管及颊侧皮质骨的位置关系。
这是一项回顾性研究，于 2021 年 9 月至 10 月在 Aga Khan 大学医院进行，纳入了 2017 年 11 月至 2021 年 10 月期间年龄在 18-71 岁的、双侧下颌后牙健康、未经治疗的、性别不限的个体的锥形束 CT 扫描。在扫描图像上测量下颌后牙根尖到下牙槽神经管边界、下颌颊侧皮质骨的最短距离。使用 SPSS 23 对数据进行分析。
106 例扫描中，男性 55 例（52%），女性 51 例（48%）。746 个 33 牙中，男性 385 个（51.6%），女性 361 个（48.4%）。对于所有下颌后牙，女性的距离均短于男性，但仅在左侧第二前磨牙和第二磨牙的根中，从根尖到 IAN 管的距离在性别间存在显著差异（p≤0.05）。关于从根尖到颊侧皮质骨的距离，在每一种牙齿类型中，男女之间均无显著差异（p>0.05）。根尖到下牙槽神经的距离之间的相关性（r<0.30）和年龄与根尖到颊侧皮质骨距离之间的相关性（r<0.28）均较弱。
计划在下颌第二前磨牙和第二磨牙根尖上方进行的手术可能会损伤下牙槽神经。
