de Castro Raquel Werczler Queiroz, Marlière Daniel Amaral Alves, Haiter Neto Francisco, Groppo Francisco Carlos, Asprino Luciana
Division of Oral Radiology, Piracicaba Dental School, University of Campinas, Campinas, Brazil.
Division of Oral and Maxillofacial Surgery, Piracicaba Dental School, University of Campinas, Limeira Avenue 901, Areião, Piracicaba, São Paulo, 13414-903 Brazil.
J Maxillofac Oral Surg. 2024 Oct;23(5):1112-1121. doi: 10.1007/s12663-024-02317-y. Epub 2024 Aug 25.
To evaluate the positions of the mandibular foramen (MF) and mandibular canal (MC) between different skeletal classes to highlight the implications for bilateral sagittal split osteotomy (BSSO).
A cross-sectional study was performed using cone-beam computed tomography on 90 patients classified into classes I, II and III. Linear measurements were performed on multiplanar reconstructions as follows: from the MF to the edge of the mandibular ramus (1), to the mandibular notch (2), to the ramus width (3) and to the occlusal plane (4); and from the MC to the alveolar crest (A), to the lower border of the mandible (B) and to the mandibular buccal cortical bone (C). Mandibular thickness (D), width (E) and height (F) of the MC were measured. Intra-class correlation coefficient (ICC) checked the reliability. Two-way ANOVA and Tukey's test were used to compare measurements and classes.
Linear measurements 2 presented a statistically significant difference between classes I and II. There was no statistically significant difference between the classes and measurements B, C, D, E and F. Linear measurements A were shorter in class III than in class II.
Although most measurements suggest that the BSSO technique does not need to be modified for each skeletal class, measurements from the MF to the mandibular notch in class II and from the MC to the alveolar crest on distal of the second molars in class III could help surgeons to recognize critical regions.
评估不同骨骼类型之间下颌孔（MF）和下颌管（MC）的位置，以突出其对双侧矢状劈开截骨术（BSSO）的影响。
采用锥形束计算机断层扫描对90例分别属于I类、II类和III类的患者进行横断面研究。在多平面重建上进行线性测量，具体如下：从MF到下颌支边缘（1）、到下颌切迹（2）、到下颌支宽度（3）以及到咬合平面（4）；从MC到牙槽嵴（A）、到下颌骨下缘（B）以及到下颌颊侧皮质骨（C）。测量MC的下颌厚度（D）、宽度（E）和高度（F）。组内相关系数（ICC）检查可靠性。采用双向方差分析和Tukey检验比较测量值和骨骼类型。
线性测量2在I类和II类之间存在统计学显著差异。在骨骼类型与测量值B、C、D、E和F之间无统计学显著差异。线性测量A在III类中比在II类中短。
尽管大多数测量结果表明，BSSO技术无需针对每种骨骼类型进行修改，但II类中从MF到下颌切迹的测量以及III类中从MC到第二磨牙远中牙槽嵴的测量可帮助外科医生识别关键区域。
