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，儿童伤害日益增多。损伤不仅影响牙齿和牙周组织，还会影响颌骨。全景x线照片能很好地识别出子宫颈、下巴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损伤中的损伤情况。下颌骨外形采用三维测量仪测量，内部采用x线计算机断层摄影。下颌骨三维有限元模型由812个节点和636个单元组成。在分析中，使用Cosmos公司的结构分析程序。将节点、单元、约束点、材料物理系数等输入程序。装载量为10公斤/倍。研究组的分类为乳牙、乳牙、第一磨牙和下颌骨的分颌角。它似乎得到了下一步的结果。在载荷作用下，两侧下颌骨的乳切牙区、对侧下颌骨的乳磨牙区、载荷作用侧第一磨牙区、下颌分界角和下颌骨分界角均存在抗应力作用。从本研究结果来看，下颌骨损伤位置不同，病变可能不同。

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.