Department of Orthopedics, Liu Hua Qiao Hospital, Liu Hua Road 111, Guangzhou 510010, China.
J Craniomaxillofac Surg. 2013 Jul;41(5):408-11. doi: 10.1016/j.jcms.2012.11.006. Epub 2012 Dec 5.
The aim of this study was to determine the effect of closing and opening muscle groups of the jaw on mandibular stability after prominent mandibular angle osteotomy, through three-dimensional finite element analysis (FEA).
Six patients with prominent mandibular angles, without malocclusion, were selected as finite element models of preoperative and postoperative prominent mandibular angle surgery. Computed tomographic (CT) scans were undertaken of the patients before and after surgery and three-dimensional images reconstructed using Simpleware software. The images were imported into an FEA software. Boundary-constrained and load conditions were applied. The solution process was run, and actions of closing and opening muscle groups were simulated and calculated.
The Von Mises stresses on the condyle position after the operation were higher than those before the operation. A significant difference was found between the stress distributions in the condyle position between prominent mandibular angle patients and mandibular angle ostectomy patients (P < 0.05).
After osteotomy, the variation in force exerted by the closing and opening muscle groups of the jaw is one of the major factors affecting mandibular stability. FEA is a promising strategy in pre-surgical planning for improving surgical success and reducing complications.
本研究旨在通过三维有限元分析（FEA）确定在下颌角突出截骨术后，闭口和开口肌群对下颌稳定性的影响。
选择 6 例无错颌的下颌角突出患者作为术前和术后下颌角突出手术的有限元模型。对患者进行术前和术后的计算机断层扫描（CT）检查，并使用 Simpleware 软件对三维图像进行重建。将图像导入 FEA 软件。施加边界约束和载荷条件。运行求解过程，并模拟和计算闭口和开口肌群的作用。
术后髁突位置的 Von Mises 应力高于术前。下颌角突出患者和下颌角截骨患者髁突位置的应力分布有显著差异（P < 0.05）。
术后，咀嚼肌闭口和开口肌群的力变化是影响下颌稳定性的主要因素之一。FEA 是一种有前途的术前规划策略，可提高手术成功率，减少并发症。
