The Effect of Taper and Apical Diameter on the Cyclic Fatigue Resistance of Rotary Endodontic Files Using an Experimental Electronic Device

Applied Sciences

Álvaro Zubizarreta-Macho¹  Vicente Faus-Llácer²  Vicente Faus-Matoses²  Ignacio Faus-Matoses²  Celia Ruiz-Sánchez²  NirmineHamoud Kharrat² 

[1] Department of Endodontics, Faculty of Health Sciences, Alfonso X El Sabio University, 28691 Madrid, Spain;Department of Stomatology, Faculty of Medicine and Dentistry, University of Valencia, 46010 Valencia, Spain;

关键词: Endodontics;    cyclic fatigue;    taper;    apical diameter;    rotary movement;    endodontic rotary files;   

DOI  :  10.3390/app11020863

来源: DOAJ

【 摘 要 】

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.

【 授权许可】

Unknown