Hirota Masayuki, Suga Kenichirou, Shibahara Takahiko
Department of Oral and Maxillofacial Surgery, Tokyo Dental College.
Department of Dentistry, Oral Surgery and Pediatric Dentistry, Tochigi Medical Center.
Bull Tokyo Dent Coll. 2018 Nov 30;59(4):237-245. doi: 10.2209/tdcpublication.2017-0056. Epub 2018 Oct 18.
The purpose of the present study was to investigate the relevance of the external morphology of the mandibular ramus, internal bone tissue structure, and maxillofacial morphology at the site for sagittal split ramus osteotomy among different facial skeletal patterns. A total of 80 patients with jaw deformities who underwent sagittal split ramus osteotomy were included in the study. The patients were divided into two groups based on facial skeletal type (skeletal Class II or skeletal Class III). A further 7 patients with no skeletal abnormalities were established as the control group (skeletal Class I). Computed tomography images obtained from these patients were 3-dimensionally reconstructed and the morphology of the mandibular ramus determined. Thickness at the mandibular foramen in Class II was greater than that in Class III, and showed the lowest value at the midpoint of the mandibular foramen and mandibular notch in Class I. Mandibular morphology showed change according to facial skeletal type. Correlations were also observed between the cephalometric analysis values and mandibular morphology.
本研究的目的是调查不同面部骨骼类型中下颌升支的外部形态、内部骨组织结构以及矢状劈开下颌升支截骨术部位的颌面形态之间的相关性。本研究共纳入80例行矢状劈开下颌升支截骨术的颌骨畸形患者。根据面部骨骼类型（骨骼Ⅱ类或骨骼Ⅲ类）将患者分为两组。另外选取7例无骨骼异常的患者作为对照组（骨骼Ⅰ类）。对这些患者的计算机断层扫描图像进行三维重建，并确定下颌升支的形态。Ⅱ类患者下颌孔处的厚度大于Ⅲ类患者，且Ⅰ类患者在下颌孔与下颌切迹中点处的厚度最低。下颌形态随面部骨骼类型而变化。在头影测量分析值与下颌形态之间也观察到了相关性。
