单侧上颌骨缺损修复三维有限元模型的建立及力学分析

目的:建立单侧上颌骨缺损的三维有限元模型,对传统单侧上颌骨缺损修复方法进行力学分析。方法:采用螺旋CT扫描、数字影像传输,应用课题组自行开发的软件MedGraphics、UG和ANSYS软件,建立单侧上颌骨缺损及带中空阻塞器修复体的有限元模型,并对传统中空阻塞器的赝复体进行三维有限元力学分析。结果:获得了单侧上颌骨缺损状态及带中空阻塞器修复体的三维有限元模型,传统中空阻塞器的赝复体健侧后牙受力较为均匀,应力集中区域位于健侧腭部基托的近前牙区。结论:建立的单侧上颌骨缺损及带中空阻塞器修复体的有限元模型具有良好的生物相似性和几何相似性,传统中空阻塞器的赝复体符合生物力学要求。

The construction and analysis of three-dimensional finite element model of human unilateral maxillary defect

PURPOSE: To built a three-dimensional finite element model of the common unilateral maxillary defect,and to study the stress of the traditional maxillofacial prostheses for unilateral maxillary defect. METHODS: The three-dimensional finite element model of unilateral maxillary defect and maxillofacial obturator prosthesis were constructed by means of spiral CT scanning, digital image transfer, self-developed software MedGraphics, UG engineering design program and ANASYS software. Then 3-D finite element stress analysis was carried out,for the prosthesis. RESULTS: The three-finite element models of the unilateral maxillary defect and maxillofacial obturator prosthesis were established. In the traditional obturator prosthesis , the stress was on the posterior teeth of the healthy side; the area of stress concentration was on the palatal base near the position of the anterior teeth. CONCLUSIONS: The three-dimensional finite element models of the unilateral maxillary defect and maxillofacial obturator prosthesis have good similarity in geometry and biology.The obturator prosthesis is in accorded with the biomechanical demands.Supported by Research Fund of Shanghai Municipal Education Commission (Grant No.04BC40) and Shanghai Leading Academic Discipline Project (Grant No.T0202).