两种镍钛器械疲劳循环抗性的研究  

Research on Cyclic Fatigue Resistance of Two Kinds of Nickel-titanium Instruments

作　　者：童方丽 朱亚利[2] 谢成婕 陈蕾 TONG Fangli;ZHU Yali;XIE Chengjie;CHEN Lei(Department of Endodontics, Stomatological Hospital, Southern Medical University, Guangzhou 510280, China;Zhaoqing Medical College, Zhaoqing 520280, China)

机构地区：[1]南方医科大学口腔医院牙体牙髓科,广东广州510280 [2]肇庆医学高等专科学校,广东肇庆520280

出　　处：《口腔医学研究》2021年第9期810-813,共4页Journal of Oral Science Research

基　　金：南方医科大学口腔医院院级课题(编号:PY2018032)。

摘　　要：目的:比较采用往复运动模式的WaveOne Gold(WOG)和采用连续旋转模式的Protaper Next(PTN)两种镍钛器械抗循环疲劳能力的差异。方法:将30支PTN X2和30支WOG Primary,放入特制的弯曲度为38°,曲率半径为5 mm循环疲劳抗力的测试装置中,计算器械折断所需的时间,测量折断部分的长度,并用扫描电镜观察器械断面形态。结果:WOG Primary的循环疲劳折断所需时间明显高于PTN X2(P<0.01),两组折断器械的长度没有显著性差异。结论:经过新型热处理并采用往返运动模式的WOG Primary较PTN X2在抗循环疲劳性能方面有明显优势。Objective:To evaluate the cyclic fatigue resistance of WaveOne Gold with reciprocating motion and Protaper Next with continuous rotary motion.Methods:Thirty WaveOne Gold Primary and 30 ProTaper Next X2 were tested in a custom-made three-pin device with a 38°curvature and 5-mm radius for cyclic loading.The time to fracture(in seconds)was recorded.The fracture length was measured with a digital caliper in millimeters.The fracture surfaces were examined under the scanning electron microscope.Results:The cyclic fatigue test revealed that WOG Primary took significantly longer time to fracture in contrast with ProTaper Next X2(P<0.05).There was no difference in the fracture length between two groups.The scanning electron microscopy examination demonstrated typical pattern of cyclic fatigue.Conclusion:WOG composed of new thermal treated alloy with reciprocating motion appeared more resistance to cyclic fatigue resistance than ProTaper Next with continuous rotary motion.

关 键 词：疲劳循环 WaveOne Gold Protaper Next 往复运动 

分 类 号：TN9[电子电信—信息与通信工程]