Yamashita F C, Iwaki L C V, Yamashita A L, Tolentino E S, Verginio V E O, Moraes T E N T, Chicarelli M, Iwaki Filho L
Postgraduate Program in Integrated Dentistry, Department of Dentistry, State University of Maringá, Paraná, Brazil.
Dental Radiology and Stomatology, Department of Dentistry, State University of Maringá, Paraná, Brazil.
Br J Oral Maxillofac Surg. 2022 Apr;60(3):279-285. doi: 10.1016/j.bjoms.2021.05.001. Epub 2021 May 10.
The aim of this study was to evaluate the position of the mandibular canal (MC) before and after bilateral sagittal split ramus osteotomy (BSSRO) using cone-beam computed tomography (CT), and to compare the position of the MC in Class II and Class III patients in the preoperative period. Patients were divided into two groups: Class II (n = 38) and Class III (n = 41). Measurements of the superior, inferior, buccal, and lingual distances of the MC in relation to the cortical bone were taken at three levels in the proximal segment of the mandible. Results were analysed using the Kruskal-Wallis test (p < 0.05). In the Class II group the superior distance of the MC at levels 2 and 3, and the inferior distance at level 3 significantly decreased after BSSRO. In the Class III group, no significant differences were found at any level, and the inferior distances at all levels were smaller preoperatively than those in the Class II group. In the Class II group the position of the MC altered in relation to superior and inferior cortical bone after BSSRO. However, the position of the MC remained stable in the Class III group. Our results also suggest a deeper cut in inferior cortical bone in Class III patients.
本研究的目的是使用锥形束计算机断层扫描（CT）评估双侧下颌升支矢状劈开截骨术（BSSRO）前后下颌管（MC）的位置，并比较术前II类和III类患者中MC的位置。患者分为两组：II类（n = 38）和III类（n = 41）。在下颌骨近端的三个层面测量MC相对于皮质骨的上、下、颊侧和舌侧距离。使用Kruskal-Wallis检验分析结果（p < 0.05）。在II类组中，BSSRO后第2和第3层面MC的上侧距离以及第3层面的下侧距离显著减小。在III类组中，在任何层面均未发现显著差异，并且所有层面的下侧距离术前均小于II类组。在II类组中，BSSRO后MC相对于上下皮质骨的位置发生了改变。然而，III类组中MC的位置保持稳定。我们的结果还表明III类患者在下颌骨下皮质骨处的截骨更深。
