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Materials 2018, 11(7), 1150; https://doi.org/10.3390/ma11071150

Torsional Behavior of WaveOne Gold Endodontic File with the Dedicated Motor of the Original WaveOne File

1
Department of Conservative Dentistry, School of Dentistry, Kyungpook National University, Daegu 41940, Korea
2
Department of Endodontics, New York University College of Dentistry, New York University, New York 10010, NY, USA
3
Department of Restorative Dentistry, College of Dentistry, Universidade Federal Fluminense, Rio de Janeiro 24220-900, Brazil
4
Department of Bioscience Research, College of Dentistry, University of Tennessee Health Science Center, Memphis, TN 38163, USA
5
Department of Conservative Dentistry, School of Dentistry, Dental Research Institute, Pusan National University, Geumo-ro 20, Mulgeum, Yangsan 50612, Korea
*
Author to whom correspondence should be addressed.
Received: 14 June 2018 / Revised: 2 July 2018 / Accepted: 3 July 2018 / Published: 6 July 2018
(This article belongs to the Section Structure Analysis and Characterization)
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Abstract

This study compares the safety limits and torsional resistances of WaveOne Gold (WOG) and WaveOne (WO) endodontic files while using the original motor. The safety limits for reciprocating angles were tested by measuring the torsional limit before plastic deformation (TLP) after repetitive torsional loading at gradually increasing load, and after single continuous rotation. Statistical analysis was performed by independent t-test at 95% confidence level. The tested specimens were observed under a scanning electron microscope (SEM). Regardless of the test mode, the distortion angle at the TLP was higher for WOG than WO (p < 0.05), and all were greater than the 150-degree rotation of the original motor. The mean values of the distortion angle and torque from the single continuous rotation loading were significantly lower than those with repetitive loading movements. Comparing the two systems under SEM, WO showed a catastrophic change in comparison with WOG. Evaluation of the lateral aspects showed longitudinal micro-cracks after 270-degree repetitive movements. After 150-degree repetitive movements, no distorted machining grooves were found in either group, but WO showed evidence of longitudinal micro-cracks. Under the conditions of this study, the torsional loading from the pre-set mode of the dedicated motor for WO was safe for WOG as well. View Full-Text
Keywords: distortion angle; reciprocating nickel-titanium file; safety angle; torsional resistance; WaveOne; WaveOne Gold distortion angle; reciprocating nickel-titanium file; safety angle; torsional resistance; WaveOne; WaveOne Gold
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
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Ha, J.-H.; Sigurdsson, A.; De-Deus, G.; Versluis, A.; Kwak, S.W.; Kim, H.-C. Torsional Behavior of WaveOne Gold Endodontic File with the Dedicated Motor of the Original WaveOne File. Materials 2018, 11, 1150.

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