State Key Laboratory of Oral Diseases & National Clinical Research Center for Oral Diseases & Other Research Platform & Dept. of Oral and Maxillofacial Surgery, West China Hospital of Stomatology, Sichuan University, China.
State Key Laboratory of Oral Diseases & National Clinical Research Center for Oral Diseases & Other Research Platform & Dept. of Oral and Maxillofacial Surgery, West China Hospital of Stomatology, Sichuan University, China; Department of Oral and Maxillofacial Surgery, Faculty of Dentistry, Ibb University, Ibb, Yemen.
J Craniomaxillofac Surg. 2020 Sep;48(9):839-844. doi: 10.1016/j.jcms.2020.07.001. Epub 2020 Jul 19.
The purpose of this study was to analyze the quantitative correlation between condylar resorption and skeletal relapse after mandibular advancement surgery.
Skeletal Class II malocclusion patients who underwent bilateral sagittal split ramus osteotomy (BSSRO) were included. Three-dimensional reconstruction was based on one-week and one-year post-operative CT scans. The condylar morphological alterations were assessed by anterior-posterior, medial-lateral diameter and condylar height. The mandibular relapse was calculated by the positional changes of pogonion, menton, gonions, gnathion and mental foramens. All data were measured by MIMICS and analyzed by SPSS software; significance was set at p<0.05.
31 patients (62 condyles) were enrolled into this study. 28 of 62 condyles showed resorption beyond 1 mm on condylar height and 15 were beyond 2 mm. Positional changes of chin, mental foramens and gonion were respectively 1.57 ± 2.36 mm, 1.31 ± 1.23 mm and 1.42 ± 1.02 mm. 21 of 31 patients experienced mandibular relapse less than 1 mm but additional 4 patients showing relapse more than 2 mm. Correlation with moderate intensity could be observed between condylar height alteration and post-operative mandibular displacement more than 1 mm (p = 0.035).
The resorption degree of condylar height can be regarded as a useful parameter for evaluating post-operative skeletal relapse.
本研究旨在分析下颌前突术后髁突吸收与骨骼复发之间的定量相关性。
纳入接受双侧矢状劈开截骨术（BSSRO）的骨性 II 类错牙合患者。基于术后一周和一年的 CT 扫描进行三维重建。通过前后径、内外径和髁突高度评估髁突形态变化。通过颏点、颏下点、下颌角点、下颌前切迹点和颏孔位置的变化来计算下颌骨复发。所有数据均通过 Mimics 进行测量，并通过 SPSS 软件进行分析；显著性水平设置为 p<0.05。
本研究纳入 31 名患者（62 个髁突）。62 个髁突中有 28 个在髁突高度上的吸收超过 1mm，15 个超过 2mm。颏、颏孔和下颌角的位置变化分别为 1.57±2.36mm、1.31±1.23mm 和 1.42±1.02mm。31 名患者中有 21 名出现小于 1mm 的下颌骨复发，但另有 4 名患者出现大于 2mm 的复发。髁突高度改变与术后下颌骨移位大于 1mm 之间存在中度强度的相关性（p=0.035）。
髁突高度的吸收程度可作为评估术后骨骼复发的有用参数。
