【摘要】 目的 :探讨种植义齿部件松动的原因及预防方法。方法 :建立标准力学模型 ,在计算机软件控制下 ,用In stron 85 11.2 0型材料测试机以 13次 /s的速度将 15kg循环力施加于修复体上 ,每 2 0万次停机一次 ,测定修复体松动度 (PTV) ,当试验结束时 ,计算机记录下总循环次数 ,再次测定PTV ,并在预应力设置后 72h及试验完成后分别测量基台螺丝的伸长量。结果 :随循环次数的增加 ,修复体松动度增加 ,到试验结束时 ,平均循环次数为 15 .3× 10 6次 ,此时基台螺丝PTV为 9.4,预应力设置后 72h及试验完成后 ,基台螺丝伸长量分别为 11.5 μm和 76 .3μm。更多还原

【Abstract】 Objective: To study the reason and prevention of loosening of implant superstructure. Methods: The study model was established. The fatique life was measured by the Instron 8511.20 materiel test machine which controlled by computer. 15kg force was applied to the crown’s top at 13 times per second. The fatique cyclic was recorded by computer when the test was finished. The periotest value(PTV) were measured every 0.2×10 6 cycles and the test finished. The abutment screw elongation were measured at 72h after the preload applied and the test finished. Results: The average crown’s fatique life was 15.3×10 6 cycles, and the abutment screw elongation at 72h after preload applied and the test finished were 11.5μm and 76.3μm. The PTV was 9.4 at the test finished.更多还原