Department of Oral and Maxillofacial Surgery, Gangnam Severance Hospital, Yonsei University College of Dentistry, 211 Eonju-ro, Gangnam-gu, Seoul, 06273, Korea.
Department of Oral and Maxillofacial Surgery, University of Illinois at Chicago College of Dentistry, Chicago, IL, USA.
BMC Oral Health. 2021 Feb 16;21(1):71. doi: 10.1186/s12903-021-01424-3.
The purpose of this study was to investigate the differences in configuration and dimensions of the anterior loop of the inferior alveolar nerve (ALIAN) in patients with and without mandibular asymmetry.
Preoperative computed tomography images of patients who had undergone orthognathic surgery from January 2016 to December 2018 at a single institution were analyzed. Subjects were classified into two groups as "Asymmetry group" and "Symmetry group". The distance from the most anterior and most inferior points of the ALIAN (IANant and IANinf) to the vertical and horizontal reference planes were measured (dAnt and dInf). The distance from IANant and IANinf to the mental foramen were also calculated (dAnt_MF and dInf_MF). The length of the mandibular body and symphysis area were measured. All measurements were analyzed using 3D analysis software.
There were 57 total eligible subjects. In the Asymmetry group, dAnt and dAnt_MF on the non-deviated side were significantly longer than the deviated side (p < 0.001). dInf_MF on the non-deviated side was also significantly longer than the deviated side (p = 0.001). Mandibular body length was significantly longer on the non-deviated side (p < 0.001). There was no significant difference in length in the symphysis area (p = 0.623). In the Symmetry group, there was no difference between the left and right sides for all variables.
In asymmetric patients, there is a difference tendency in the ALIAN between the deviated and non-deviated sides. In patients with mandibular asymmetry, this should be considered during surgery in the anterior mandible.
本研究旨在探讨下颌骨不对称患者与无下颌骨不对称患者下牙槽神经前支（ALIAN）形态和尺寸的差异。
对 2016 年 1 月至 2018 年 12 月在一家机构接受正颌手术的患者的术前计算机断层扫描图像进行分析。将患者分为“不对称组”和“对称组”两组。测量 ALIAN 最前点和最下点（IANant 和 IANinf）到垂直和水平参考平面的距离（dAnt 和 dInf）。还计算了 IANant 和 IANinf 到颏孔的距离（dAnt_MF 和 dInf_MF）。测量下颌体和正中联合区域的长度。所有测量均使用 3D 分析软件进行分析。
共有 57 名符合条件的患者。在不对称组中，非偏侧的 dAnt 和 dAnt_MF 明显长于偏侧（p < 0.001）。非偏侧的 dInf_MF 也明显长于偏侧（p = 0.001）。非偏侧的下颌体长度明显较长（p < 0.001）。正中联合区域的长度无显著差异（p = 0.623）。在对称组中，所有变量在左侧和右侧之间均无差异。
在不对称患者中，偏侧和非偏侧的 ALIAN 之间存在差异趋势。在有下颌骨不对称的患者中，在进行下颌前骨手术时应考虑这一点。
