摘要
目的:通过三维有限元法,研究种植义齿在扭矩一定的情况下,摩擦系数改变对固位螺钉松动的影响。方法:本研究应用Ansysis 9.0软件,计算结果由三维数字化图像和图表两种形式来说明:三维数字化图像反映每种模型在各种工况下的应力分布总特征和趋势;图表说明摩擦系数为0.26和0.12种植体基台所受三种外力不同的情况(螺杆等效应力最大值应力、最大值部位、位移最大值)。结果:在垂直加载35N力情况下,摩擦系数为0.26,螺钉上的最大等效应力为19.076MPa,摩擦系数为0.12,螺钉上的最大等效应力为21.404MPa;在水平加载10N力的情况下,摩擦系数为0.26,螺钉上的最大等效应力为19.118MPa,摩擦系数为0.12,螺钉上的最大等效应力为21.474MPa;在倾斜45°加载70N的情况下,摩擦系数为0.26,螺钉上的最大等效应力为44.336MPa,摩擦系数为0.12,螺钉上的最大等效应力为45.214MPa,螺钉上的应力分布规律大致相同,均在螺钉的第一个螺纹附近。结论:种植体基台施加的垂直35N、水平10N、倾斜45°70N不同外力,对固位螺钉应力及剩余位移的影响也不同,它们之间呈线形相关。固位螺钉柄与螺丝头交界变化的部位,为螺丝的危险界面。
Objective： To investigate the effects of change in friction coefficient on implant abutment screw loosening with a constant torque on dental implants by using three dimensional finite element analysis. Methods： The digital models were obtained using Ansysis 9.0 software. The characteristics of the model distributions were presented using 3D digital imaging. The distributions of forces （maximum of force, maximum of location, and maximum of moving distance） on the implant abutment under the friction coefficients of 0.26 and 0.12 were presented by using graphic charts. Results： Under the perpendicular load of 35N, the maximum of force on the implant screws was 19.076Mpas with the friction coefficient of 0.26, and the maximum of force on the implant screws was 21.404Mpas with the friction coefficient of 0.12; under the horizontal load of 10N, the maximum of force on the screws was 19.118MPa with the friction coefficient of 0.26, and the maximum of force on the screws was 21.474MPa with the friction coefficient of 0.12; under the force of70N fi：om 45 degree angulation, the maximum of force on the screws was 44.336 MPa with the fiiction coefficient of 0.26, and the maximum of force on the screws was 45.214MPa with the friction coefficient of 0.12. The distribution of force on the implant screws was all similarly located around the area of the first thread of the screws. Conclusion： 35N Perpendicular, 10N horizontal and 70N 45-degree-angulation forces on the implant abutments could provide different effects on distribution of loads and dis- tance of moving. They show a linear correlation. The intersection between the head and shank of the screw is at a high risk for breaking.
出处
《口腔颌面修复学杂志》
2014年第6期351-354,共4页
Chinese Journal of Prosthodontics
关键词
摩擦系数
种植体
三维有限元法
friction coefficient
dental implant
3D Finite element analysis
