【摘要】 本试验比较研究了膨胀复合型螺纹桩、铸造桩、成品螺纹桩固位力的异同。以标准尺寸有机玻璃模拟上中切牙根27个,分成3组,分别制作膨胀复合型螺纹桩、成品螺纹桩和铸造桩,在INSTRON4302万能试验机进行拉伸测试,加载速度10 mm/min,至桩核松动或脱位,记录最大载荷。另测试平面和轴面粘结力,测算出桩核的粘结力及摩阻力大小。结果发现膨胀复合型螺纹桩固位力明显高于铸造桩和成品螺纹桩,差别有统计学意义(P<0.05),铸造桩固位力略高于成品螺纹桩固位力,但差别无统计学意义,(P>0.05)。通过该试验我们认为膨胀复合型螺纹桩的固位力学性能优于铸造桩和成品螺纹桩,是一种新型的具有良好力学性能的桩核修复方法。更多还原

【Abstract】 To study the effects of different post design on retention.27 simulated tooth roots made of PMMA were divided into three groups,then manufactured the cement-expanded composite screw post-core system(CECSP),cement screw post-core system(CSP) and cast metal post-core system(CMP).The root and post-core system was tensiled by the speed of 10 mm/min on the Instron 4302 and recorded the retention force.It appeared significantly different between retention force of CECSP and CSP and CAM(P<0.05).As a result,the retention mechanical properties of CECSP was much better than those of cement screw post-core system and cast metal post-core system.Therefore,it is possible to find a new way for restoration of endodontically treated teeth.更多还原