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The Effect of Taper and Apical Diameter on the Cyclic Fatigue Resistance of Rotary Endodontic Files Using an Experimental Electronic Device
Applied Sciences ( IF 2.838 ) Pub Date : 2021-01-18 , DOI: 10.3390/app11020863
Vicente Faus-Llácer , Nirmine Hamoud Kharrat , Celia Ruiz-Sánchez , Ignacio Faus-Matoses , Álvaro Zubizarreta-Macho , Vicente Faus-Matoses

The aim of this study was to analyze the effect of the taper and apical diameter of nickel–titanium (NiTi) endodontic rotary files on the dynamic cyclic fatigue resistance. A total of 50 unused conventional NiTi wire alloy endodontic rotary instruments were used in this study. All NiTi endodontic rotary files were submitted to a custom-made dynamic cyclic fatigue device until fracture occurred. The time to failure, the number of cycles to failure, the number of pecking movements, and the length of the fractured file tip were analyzed using the analysis of variance (ANOVA) test. In addition, the Weibull characteristic strength and Weibull modulus were also calculated. The paired t-test revealed statistically significant differences between the time to failure, number of cycles to failure, and number of cycles of in-and-out movement of both the apical diameter (p ˂ 0.001) and the taper (p ˂ 0.001) of NiTi endodontic rotary files; however, the results did not show statistically significant differences between the mean length of the fractured files regarding the apical diameter (p = 0.344) and taper study groups (p = 0.344). Increased apical diameter and taper of NiTi endodontic rotary files decreased their dynamic resistance to cyclic fatigue.

中文翻译:

锥形和根尖直径对使用实验电子设备的旋转牙髓锉的循环疲劳阻力的影响

这项研究的目的是分析镍钛(NiTi)牙髓旋转锉的锥度和根尖直径对动态循环疲劳强度的影响。本研究共使用了50台未使用的常规NiTi线合金牙髓旋转器械。所有的NiTi牙髓旋转锉都被送至定制的动态循环疲劳装置,直到发生骨折。使用方差分析(ANOVA)测试分析了破坏时间,破坏循环次数,啄齿运动次数和破碎的锉刀尖端的长度。另外,还计算了威布尔特征强度和威布尔模量。配对t-test显示统计学显著的时间之间失效的失效循环数和在和出运动两者的尖直径(的循环数的差异,p ˂0.001)和锥形(p镍钛牙髓的˂0.001)旋转锉 但是,结果没有显示出关于根尖直径的骨折锉的平均长度(p = 0.344)和锥形研究组(p = 0.344)在统计学上的显着差异。NiTi根管旋转锉的根尖直径和锥度增加,降低了其对循环疲劳的动态抵抗力。
更新日期:2021-01-18
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