下颌后牙单端桥及其支持组织修复前后有限元模型建立

目的:建立下颌后牙单端固定桥及其支持组织修复前后的三维有限元模型.方法:以人类正常牙列完整的下颌骨标本为建模基础,采用CT扫描技术,利用AutoCAD与ANSYS软件建立左侧下颌后牙单端固定桥及其支持组织修复前后的几何模型和三维有限元模型.结果:构建的下颌后牙单端固定桥修复前后的几何模型接近中国人牙齿的实际尺寸.修复前、后牙体、牙周膜及牙槽骨的三维有限元模型分别划分为142 640个节点、101 938个单元和168 756个节点、119499个单元.结论:采用CT扫描技术,结合AutoCAD与ANSYS软件所建模型结构层次清晰、单元划分精细,具有良好的形态相似性和还原性,能够满足模拟加载的需要.

The construction of the three-dimensional finite element model of the abutment and peridontal tissue of molars cantilever fixed bridge

Aim:To establish three-dimensional finite element models of a human mandibular molar cantilever fixed bridge to supply biomechanics behavior of the periodontal tissue. Methods: A normal hu-man mandible was used as an anatomy foundation to build geometry models and three-dimensional finite element models which are completed with CT scaning, Auto CAD software and ANSYS software before and after restoration of the mandibular molar cantilever fixed bridge and the corresponding periodontal substance. Results: The constructed geometry models are similar to chinese teeth in size. For the three-dimensional finite model including teeth, periodontal ligament and alveolar bone, there are 142640nodes, 101 938 elements before restoration and 168 756 nodes, 119 499 elements after restoration. Con-clusions:Establishing the models of the teeth and periodontal tissues by CT scanning technique, Auto-CAD and ANSYS software have clear hierarchical structures and fine element partitions. The constructed models have good similarity to the morphology of the three-dimensional images. They can serve for the needs of the three-dimensional stress analysis.