下颌骨双侧升支矢状劈开坚强内固定三维有限元模型的建立和初步分析  

Establishment and primary analysis of the three-dimensional finite element model of mandibular bilateral sagittal split ramus osteotomy with rigid internal fixation

作　　者：许崇涛[1] 孙庚林[1] 周健[1] 王鹏林[2] 

机构地区：[1]天津医科大学总医院口腔科,天津300052 [2]天津理工大学机械工程学院

出　　处：《中华整形外科杂志》2007年第3期215-217,共3页Chinese Journal of Plastic Surgery

基　　金：天津市卫生局课题（项目编号03KZ23）

摘　　要：目的建立下颌骨双侧升支矢状劈开坚强内固定三维有限元模型，为进一步研究升支矢状劈开术打下基础。方法用螺旋CT断层扫描技术及ANSYS有限元软件在计算机上建立下颌骨三维实体模型，修改下颌骨模型，模拟升支矢状劈开，根据内固定系统的规格建立内固定模型，对以上各组分别网格化，建立下颌骨升支矢状劈开坚强内固定三维有限元模型。对小型钛板和双层皮质螺钉内固定模型施加100N前牙咬合力，计算下颌骨及内固定系统的应力情况。结果建立了含牙齿的下颌骨双侧升支矢状劈开小型钛板和双层皮质固位螺钉的内固定模型。在前牙咬合时，上缘钛板固定情况下，远心骨段和近心骨段的近中螺钉固位处应力值较大；双层皮质螺钉固定时，颌骨的最大应力位于远心骨段上缘近中螺钉固位处的内侧面。结论建立的模型具有较好的几何及物理相似性，可以作为研究下颌骨双侧升支矢状劈开坚强内固定的原始模型。Objective Establish the three-dimensional finite element models of mandibular bilateral sagittal split ramus osteotomy （BSSRO） with rigid internal fixation（RIF）, for further study of BSSRO. Methods CT scanned technology and the finite element software （ANSYS） were used to establish the original threedimensional model of mandible, modify the model to animate the BSSRO, then establish the model of RIF, last mesh the model to establish the finite element model of BSSRO with RIF. Apply 100 N occlusion force at the central incisor; calculate the stress distribution of the mandible and the RIF. Results Three-dimensional finite element models of BSSRO with RIF were established, such as miniplate model, bicortical fixation screw model. When biting with the incisor and fixed with upper plate, the stress of the medial screw position of the distal and medial segment of mandible is high. When fixed with bicortical fixation screw, the highest stress position located at the internal surface of the medial screw＇ s position of the distal segment of mandible. Conclusions The mentioned methods proved feasible in establishing the finite element models of BSSRO with RIF. The models can be applied to the study of BSSRO with RIF.

关 键 词：双侧升支矢状劈开术 有限元 坚强内固定 

分 类 号：R686[医药卫生—骨科学]