单侧下颌骨牵张成骨的数值模拟

Numerical simulation of unilateral mandibular distraction osteogenesis

目的针对颜面短小患者建立下颌骨及咀嚼肌模型,通过有限元方法研究牵张成骨过程中下颌骨的形变规律,并与患者实际手术效果进行对比,为类似病例的治疗过程提出改进意见。方法依据临床颜面短小患者原始数据,结合MIMICS医学影像控制系统软件,运用三维重建技术构造患者下颌骨及咀嚼肌的实体结构,最后导入ANSYS有限元软件完成单侧下颌骨延长的有限元模型,并模拟手术效果。结果所建立的术前术后有限元分析模型具有数字化、个性化特征。结论数值模拟结果与手术效果进行对比,重合度较好,可以为不同病情的病人术前提供个性化的手术指导。

Objective To study the law of shape changes of mandiblular distraction osteogenesis in the patient with hemifacial microsomia（HFM） and compare the results with the real effect on the patient by establishing the models of mandibular and masticatory muscles,and to put forward some good suggestions on procedures of treating patients diagnosed as HFM and related cases.Methods Based on the original data of the patient with HFM,combined with the MIMICS software（medical image control system software）,the model of the patient＇s mandibular and masticatory muscles was constructed by applying the technique of three dimensional（3D） reconstruction,and then put the entity structure into the ANSYS software to simulate the effect of the surgery.Results The established preoperative and postoperative finite element analytic model could present the characteristics such as digitalization and individuation.Conclusions Compared with the effects of the real surgery for the same patient,the result of numerical simulation showed to be good matching and could provide personalized guidance for different patients before their operation.