J Dent Res Dent Clin Dent Prospects. 2021;15(3): 172-177.
doi: 10.34172/joddd.2021.029
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Basic Research

Original Article

A comparative investigation between ProTaper Next, Hyflex CM, 2Shape, and TF-Adaptive file systems concerning cyclic fatigue resistance

Sibel Koçak 1 ORCID logo, Faruk Furkan Şahin 2 ORCID logo, Olcay Özdemir 3* ORCID logo, Mustafa Murat Koçak 1 ORCID logo, Baran Can Sağlam 1 ORCID logo

1 Department of Endodontics, Faculty of Dentistry, Zonguldak Bülent Ecevit University, Zonguldak, Turkey
2 Private Dental Clinic, Istanbul, Turkey
3 Department of Pedododontics, Faculty of Dentistry, Zonguldak Bülent Ecevit University, Zonguldak, Turkey
*Corresponding author: Olcay Özdemir, Email: ozdemir.olcay@yahoo.com


Background. This study aimed to compare the cyclic fatigue resistance of ProTaper Next, Hyflex CM, 2Shape, and TF-Adaptive nickel-titanium endodontic file systems with various alloy properties and production methods and investigate the fractured cross-sectional surface of files due to cyclic fatigue by scanning electron microscopy (SEM).

Methods. A total of 120 instruments were used (n=30). For standardization, #25/.06 apical diameter and taper angle were selected for each file system. The experiment of files was subjected to a static cyclic fatigue model. The time for files’ failure was recorded with a digital chronometer and multiplied by the rotation speed to calculate the number of cycles. Kolmogorov-Smirnov, one-way ANOVA, and post hoc Bonferroni analysis were used for statistical analysis. Statistical significance was set at P<0.05.

Results. The number of cycles for the failure of files was compared between the groups, and significant differences were found (P<0.05). The number of cycles for instrument failure was recorded from the highest to the lowest as follows: Hyflex CM, TF-Adaptive, ProTaper Next, and 2Shape.

Conclusion. The files were fractured at different average numbers of cycles in an artificial canal in all the groups. The Hyflex CM demonstrated better cyclic fatigue resistance than TF Adaptive, ProTaper Next, and 2Shape file systems. Factors such as production patterns, alloy properties, and the phase in which the files were produced might affect the lifespan of file systems.

Keywords: 2Shape, Hyflex CM, ProTaper Next, Scanning electron microscope, Static cyclic fatigue, TF-Adaptive

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Submitted: 11 Oct 2020
Accepted: 29 Mar 2021
ePublished: 25 Aug 2021
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