Chen Zhuogeng, Chen Donghui, Tang Li, Wang Fenfen
From the Departments of *Implant Dentistry, Stomatology Hospital, †Oral Medicine & Periodontology, Stomatology Hospital, and ‡Occupational Health and Environmental Health, School of Public Health, Guangxi Medical University, Nanning, Guangxi, China.
J Comput Assist Tomogr. 2015 Jan-Feb;39(1):86-93. doi: 10.1097/RCT.0000000000000166.
The position of the mental foramen and the anterior loop length of the inferior alveolar nerve serve as important anatomical landmarks for surgical procedures in the anterior mandibular region. The purpose of this study was to determine the relationship between the anterior loop of the inferior alveolar nerve and the mental foramen by combining cone beam computed tomography and Mimics, a software used to construct 3-dimensional (3D) interactive models of anatomical structures.
Cone beam computed tomography images from a total of 60 patients were obtained and studied using GALAXY viewer or were imported into Mimics. The anterior loop of the inferior alveolar nerve was reconstructed 3-dimensionally, and then relevant parameters were measured.
The parameters were measured, and their values include mean (SD) anterior loop length, 1.16 (1.78) mm; anterior loop angle, 19.13 (26.89) degrees; inferior alveolar canal diameter, 3.01 (0.67) mm; height of the inferior alveolar canal, 10.32 (1.56) mm; 2-dimensional mental foramen diameter, 2.97 (0.61) mm; 3D mental foramen diameter, 2.95 (0.59) mm; 2-dimensional vertical height of the mental foramen, 14.67 (1.67) mm; and 3D vertical height of the mental foramen, 14.61 (1.69) mm. The mental foramen was located apically between the first and second premolars in 51.67% and below the second premolar in 40.83% of the cases.
A relationship was observed between the location of the mental foramen and the presence of the anterior loop of the inferior alveolar nerve. We highlight the effectiveness of cone beam computed tomography and 3D reconstruction in the identification of important anatomical structures relevant for preoperative assessment for surgical procedures in the anterior region of the mandible.
颏孔的位置及下牙槽神经前袢长度是下颌前部区域外科手术的重要解剖标志。本研究的目的是通过结合锥形束计算机断层扫描（CBCT）和Mimics软件（一种用于构建解剖结构三维（3D）交互式模型的软件）来确定下牙槽神经前袢与颏孔之间的关系。
共获取60例患者的锥形束计算机断层扫描图像，使用GALAXY viewer进行研究或将其导入Mimics。对下牙槽神经前袢进行三维重建，然后测量相关参数。
测量了各项参数，其值包括平均（标准差）前袢长度1.16（1.78）mm；前袢角度19.13（26.89）度；下牙槽神经管直径3.01（0.67）mm；下牙槽神经管高度10.32（1.56）mm；二维颏孔直径2.97（0.61）mm；三维颏孔直径2.95（0.59）mm；二维颏孔垂直高度14.67（1.67）mm；三维颏孔垂直高度14.61（1.69）mm。在51.67%的病例中，颏孔位于第一和第二前磨牙根尖之间，40.83%的病例中颏孔位于第二前磨牙下方。
观察到颏孔位置与下牙槽神经前袢的存在之间存在关联。我们强调了锥形束计算机断层扫描和三维重建在识别与下颌前部区域手术术前评估相关的重要解剖结构方面的有效性。
