摘要
通过建立直径为1.4,1.6,1.8mm,长度为6,8,10mm,螺纹深度为0.2mm,螺纹间距0.5mm的Ti质微种植体支抗与颌骨有限元模型,研究在常用栽荷1.96N正畸力与微种植体长轴呈45°,60°和75°三种角度时的Ti质微种植体应力分布和大小。分析得出,应力主要集中在微种植体颈部1mm内,在其颈部1.2mm的范围内应力值的衰减都很明显,在颈部1.2mm的范围内曲线较陡。在设定的加载条件下,不同直径的微种植体应力值呈规则的变化趋势,直径1.8mm,45°时微种植体的各应力值极值最小。微种植体长度对应力的影响不大,位移变化均较小。
The stress distributions and values of the micro-implant are investigated in the study through modeling with different diameters ( 1. 4,1.6,1.8 mm), different length ( 6,8,10 mm) and different axis angles (45 °, 60°and 75°) with 1.96 N orthodontic force. The 3-dimesion finite element analysis shows that the stresses mainly center on micro-implant neck within 1 to 1.2 mm, and the stresses have nile changes with different diameters under loading. The diameter of 1.8 mm micro-implant has mini-stress distribution. The length of micro-implant screws has little influence on the stresses.
出处
《后勤工程学院学报》
2008年第4期96-99,共4页
Journal of Logistical Engineering University
关键词
正畸力
微种植体
几何模型
有限元
应力
orthodontic force
micro-implant
geometry model
FEM
stress