Abstract | INTRODUCTION: Recent improvements in alloys, kinematics, and concepts have been combined to increase the cyclic fatigue resistance of nickel-titanium (NiTi) instruments. The aim of this study was to compare the cyclic fatigue resistance of new M-Wire reciprocating WaveOne ( Dentsply Maillefer, Ballaigues, Switzerland) and Reciproc (VDW GmbH, Munich, Germany) files at 2 levels. METHODS: Sixty Reciproc and 60 WaveOne new files were fixed to a specifically designed device and tested in tempered steel canals with a 3-mm radius and a 60° angle of curvature. The motor used was programmed as defined by each manufacturer, and the specific reciprocating motion was followed. Thirty files of each brand were tested at 5 mm, and 30 were tested at 13 mm from their tips. The time to failure was registered. Weibull analysis was used to calculate the mean life, beta, and eta parameters. RESULTS: The probability of the mean life was higher for Reciproc than WaveOne files at both levels, with the probability of the Reciproc mean life being 62% higher than that of WaveOne at 5 mm from the tip and 100% higher at 13 mm (all statistically significant). The probability of the mean life was higher at 5 mm than at 13 mm in both systems. The results may have been partially conditioned by the different motions that manufacturers propose for each system. CONCLUSIONS: Reciproc files were more resistant to cyclic fatigue than WaveOne files at both distances from the tip. Both systems had greater cyclic fatigue resistance at 5 mm than at 13 mm from the tip.
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Authors | Ana Arias, Juan J Perez-Higueras, José C de la Macorra |
Journal | Journal of endodontics
(J Endod)
Vol. 38
Issue 9
Pg. 1244-8
(Sep 2012)
ISSN: 1878-3554 [Electronic] United States |
PMID | 22892743
(Publication Type: Comparative Study, Journal Article)
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Copyright | Copyright © 2012 American Association of Endodontists. Published by Elsevier Inc. All rights reserved. |
Chemical References |
- Dental Alloys
- titanium nickelide
- Nickel
- Titanium
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Topics |
- Dental Alloys
(chemistry)
- Dental Stress Analysis
(instrumentation)
- Equipment Design
- Equipment Failure
- Humans
- Materials Testing
- Nickel
(chemistry)
- Probability
- Root Canal Preparation
(instrumentation)
- Stress, Mechanical
- Surface Properties
- Time Factors
- Titanium
(chemistry)
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