Analysis of Stresses on the fracture of mandibular bone in the chidhood used the finite element method

由于交通事故的频繁发生和环境的变化，儿童伤害日益严重。损伤不仅影响牙齿和牙周组织，而且影响颌骨。全景X线片能很好地显示颈部、颏部和下颌骨骨干的骨折线。本研究的目的是利用有限元方法研究下颌骨骨折在创伤中的损伤情况。用三维测量仪测量下颌骨外形，用X线计算机断层摄影机拍摄下颌骨内部。下颌骨三维有限元模型由812个节点和636个单元组成。分析中采用了Cosmos公司的结构分析程序。程序中输入节点、单元、约束点和材料物理系数。负载量为10 kg-倍。研究组的分类分别为乳切牙、乳磨牙、第一磨牙和下颌角的负荷划分。似乎接下来就有结果了。下颌切牙区在两侧下颌颈、乳磨牙区在对侧下颌颈、第一磨牙区在负荷侧第一磨牙区、颌角区在颌角区和下颌颈的载荷中均存在阻力。从本研究结果来看，不同的下颌骨损伤部位，其损伤程度可能有所不同。

There is increasingly the child injury by frequent occurrence of traffic accident and change of the environment. The injury affects not only tooth and tooth periodontium but also jaw bones. The panorama x-ray photograph recognizes well the fracture line of cervix, chin and diaphysis of the mandible. The purpose of the research is to research the damage of mandibular fracture in the injury using the finite element method. The mandible external form was measured using three-dimension measuring instrument, and the inside was photographed by x-ray computed tomograph. The three-dimensional finite element model of the mandible consists of 812 nodes and 636 elements. In the analysis, the structural analysis program made by Cosmos company was used. The following were input into the program : Node, element, restraint point and material physical coefficient. The load quantity was made to be 10kg-fold. The classification of research groups are the load for a deciduous incisor teeth, deciduous molar, first molar and angle of jaw division of the mandible. It seemed to obtain the result next. There was a resistant stress in the load from deciduous incisor tooth divisions of the mandible in both sides cervix of the mandible, from deciduous molar tooth divisions in the cervix in the opposite side of the mandible, from first molar divisions in first molar division in the load side and from an angle ofjaw division in angle of jaw division and cervix of the mandible. From the result of this research, the lesion may be different by the injury position of the mandible.