【摘要】 目的:通过三维有限元法分析摇椅弓角度和弧形深度的变化对前后牙根和牙周组织Von Mises综合应力分布的影响.方法:采用ANSYS有限元软件建立下颌牙列、牙周支持组织以及不同角度、不同弧形深度的0.018×0.025英寸不锈钢下颌标准弓形摇椅弓的三维有限元模型,将摇椅弓变形前后的位移差作为荷载施加于有限元模型,通过多次迭代使其满足变形协调条件,计算出牙根和牙周组织的应力分布状况.结果:在摇椅弓作用下牙根受到的综合应力最大(0.18～10.03kPa),牙槽骨次之(0.05～1.13kPa),牙周膜最小(0.01～0.10kPa),且综合应力随着摇椅弓角度和弧形深度的增加而增加,综合应力集中分布于牙根、牙槽骨和牙周膜的颈部和根尖部.结论:摇椅弓角度和弧形深度的变化对牙周组织应力产生显著影响.更多还原

【Abstract】 AIM: To analyze the Von Mises distribution on tooth roots,periodontal ligaments and alveolar bone that were produced by the reverse-curve arch wires of various angles and depths with the method of 3-dimensional(3-D) finite element analysis.METHODS: Three-D finite element models of lower teeth,periodontal ligaments and alveolar bone as well as the 0.018 inch×0.025 inch stainless steel reverse-curve arch wires with different angles and depths were developed with the ANSYS finite element software.The displacements of deformation of the reverse-curve arch wires were established on the models.The Von Mises distribution on tooth roots and periodontal ligaments was calculated.RESULTS: Affected by the reverse-curve arch wires,the highest Von Mises(0.18-10.03 kPa) was observed on the root surface,the intermediate(0.05-1.13 kPa) on the alveolar bone,and the lowest(0.01-0.10 kPa) on the periodontal ligaments.The Von Mises on tooth roots,periodontal ligaments and alveolar bones was increased along with the increase of angle and depth of the reverse-curve arch wires.The concentration of Von Mises was produced at the cervix and apex of the root surface,alveolar bone and periodontal ligaments.CONCLUSION: The variation of the angle and depth of the reverse-curve arch wires produces evident effect on Von Mises on tooth roots,periodontal ligaments and alveolar bone.更多还原