An Investigation of the Metal Fatigue of Different Nickel-Titanium Rotary Instruments After Prolonged Use

Q3 Dentistry

Cumhuriyet Dental Journal Pub Date : 2022-05-16 DOI:10.7126/cumudj.1098476

K. Akpınar, Gizem KUTLU CENGİZ

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Abstract

Objective:This study aimed to compare the cyclic fatigue (CF) resistance of nickel-titanium (Ni-Ti) endodontic instruments from ProTaper (PTU), ProTaper Next (PTN), Wave One (WO), and Reciproc (RPC). Materials and Methods:In our study, PTU, PTN, WO, and RPC rotary files were divided into the experimental and control groups containing an equal number of samples. The experimental group files were used in the shaping of 80 extracted human lower premolar and lower molar teeth. The experimental and control group kits were then placed in the test apparatus and observed until they fractured. Fracture times were recorded and statistically evaluated. Results:In the one-to-one comparisons of the experimental and control group files, while the differences between the fracture times of the experimental and control group files were found to be statistically insignificant in RPC, WO, PTU, and PTN X1 files (p>0.05), fracture time differences were statistically significant in all PTN X2 files (p0.05). Conclusion:The files used with reciprocal movement were found to be safer in terms of metal fatigue when compared to the other files used with rotational movement after the preparation.

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不同镍钛旋转仪器长时间使用后的金属疲劳研究

目的:比较ProTaper (PTU)、ProTaper Next (PTN)、Wave One (WO)和Reciproc (RPC)的镍钛(Ni-Ti)根管器械的抗循环疲劳(CF)性能。材料与方法:本研究将PTU、PTN、WO和RPC旋转文件分为实验组和对照组，每组样品数量相等。采用实验组锉对80颗拔除的人下前磨牙和下磨牙进行整形。然后将实验组和对照组的试剂盒放置在测试设备中观察，直到它们断裂。记录骨折时间并进行统计评估。结果:在实验组与对照组的一对一比较中，RPC、WO、PTU、PTN X1的实验组与对照组的骨折次数差异无统计学意义(p < 0.05)，而PTN X2的所有文件的骨折时间差异均有统计学意义(p < 0.05)。结论:制备后，相对于旋转运动锉，反向运动锉在金属疲劳方面更安全。

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