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探讨种植体-基台-修复体系统中各部件的受力状况及其疲劳寿命。按FDA的建议和标准建立力学实验模型并简化为数学几何图形,依据几何图形对直基台单冠种植修复系统各部件(固位螺丝、基台螺丝、种植体)受力状况进行理论分析。在计算机控制下,用Instron8511.20型多功能材料测试机测定样本的疲劳寿命,并测量实验前后基台螺丝的长度,计算伸长量。在各参数相同时,直基台单冠种植修复方式的固位螺丝、基台螺丝、种植体所受扭力依次增加。预应力(20 N.cm)设置72 h后及试验完成后,基台螺丝伸长量分别为(11.5±0.99)μm和(76.3±5.38)μm。疲劳寿命平均为(15.3×106±1.99×106)次,种植义齿受力后,种植体所受扭力最大,基台螺丝在力的作用下会伸长,从而造成义齿部件松动。
To investigate the stress state and fatigue life of each component in implant-abutment-restorative system. According to FDA recommendations and standards, a mechanical experiment model was established and simplified as a mathematical geometry. Based on the geometrical figures, the stress analysis of each component (screw fixation, abutment screw fixation and implant implantation) of the single-crown implant system was analyzed theoretically. Under computer control, the fatigue life of samples was measured by Instron8511.20 multi-functional material testing machine, and the length of abutment screws was measured before and after the experiment to calculate the elongation. In the same parameters, the straight base single crown implant repair screws, abutment screws, implants, followed by increased torque. After 72 h of prestressing (20 N.cm) setting and after completion of the test, the abutment screw elongation was (11.5 ± 0.99) μm and (76.3 ± 5.38) μm, respectively. The average fatigue life was (15.3 × 106 ± 1.99 × 106) times. After implants were implanted, the implant suffered the most torsional force. The abutment screws were elongated under the action of force, resulting in loosening of the denture components.