个性化下颌钛支架植入体的设计与生物力学评价  

The Design and Biomechanical Evaluation of Individual Mandibular Prosthesis

作　　者：张秀娟[1] 王冬梅[1] 孙健[2] 王成焘[1] 张富强[2] 

机构地区：[1]上海交通大学机械与动力工程学院,上海200030 [2]上海第二医科大学附属第九人民医院,上海200011

出　　处：《上海交通大学学报》2005年第7期1167-1171,共5页Journal of Shanghai Jiaotong University

摘　　要：基于CT断层扫描图像数据,利用CAD、有限元分析技术重建正常下颌骨的三维几何、有限元模型.对模型进行分割,模拟下颌骨右侧体部缺损,参照天然下颌骨几何形态设计下颌钛支架植入体,并对其重建下颌骨的生物力学效果进行三维有限元分析.结果表明,钛支架植入体在咀嚼力作用下,义齿基桩颈部及预留种植孔周围应力较大,其他部位应力值较低且分布均匀;颈部的应力值随孔道直径的增加而明显降低,基桩高度与预留孔道深度的比例变化对应力大小及分布特性基本没有影响;钛支架植入体重建下颌骨在咀嚼力作用下,支架的应力比自然骨应力大1个数量级,呈现明显的应力遮挡效应;根据钛支架植入体上的应力分布状态对其进行镂孔设计,应力分析结果显示其强度依然满足功能要求.由以上分析结果可知,义齿预留孔道的深度在保证螺纹强度的前提下,可尽量减小,以减小钛支架的体积;钛支架植入体的镂孔设计在满足功能强度前提下,可以降低其整体尺寸,同时提高其结构生物相容性和临床实用性.This study was designed to reconstruct shape and function of the mandible with a large segment defect. The normal mandible 3D model was remodeled using data extracted from computed tomography （CT） scan. A large surgical defect was simulated on the right side of the mandible model beginning mesially from the angle of the mandible and extending to the mesial side of canine teeth along the body of the mandible. The local mandibular prosthesis model with the suitable dental implants was designed to reconstruct the defected mandible based on the dimension and contour of the resected mandible segment. The material of the prosthesis is titanium. The biomechanics effect of the prosthesis was evaluated using finite element analysis （FEA） method. The most stress concentration areas are the neck of abutment. The stress decreases significantly with the increase of the diameter of the implant hole. And the ratios of the height of the abutment with the depth of the hollow have little effect on the stress. The stress in the prosthesis is approximately 10 times higher than that of the nature bone . There is an obvious barrier effect of the stress. The stress in the prosthesis is symmetric and much lower than the static yield limit. The results suggest that this individual mandible prosthesis design is secure and feasible. And reducing the volume of the prosthesis under the premise of biomechanics ensures the soft-tissue coverage. Using this prosthesis to reconstruct the mandible, main complication will be decreased in clinic.

关 键 词：下颌骨重建 钛植入支架 生物力学 三维有限元分析 

分 类 号：R318.01[医药卫生—生物医学工程]