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Safety of the factory preset rotation angle of reciprocating instruments.
- Source :
-
Journal of endodontics [J Endod] 2014 Oct; Vol. 40 (10), pp. 1671-5. Date of Electronic Publication: 2014 Jul 09. - Publication Year :
- 2014
-
Abstract
- Introduction: This study aimed to investigate the torsional resistance of 2 reciprocating nickel-titanium instruments (Reciproc [VDW, Munich, Germany] and WaveOne [Dentsply Maillefer, Ballaigues, Switzerland]) operated at the maximum rotating angle in a proprietary motor.<br />Methods: With the file tip secured at various levels (3, 4, or 5 mm) of Reciproc R25 and WaveOne Primary, the distortion angles and torsional loads were monitored during counterclockwise movement at 2 rpm until fracture (n = 10 at each level) for a load-distortion graph. The rotation angles and loads at the beginning point of the plateau, the ultimate torsional strength, final fracture angle, and toughness were determined. The data were analyzed using 1-way analysis of variance and the Tukey post hoc test at α = .05. The lateral longitudinal aspect and the fracture cross-section of each specimen were examined by scanning electron microscopy after the test.<br />Results: The rotation angle at the beginning point of the plateau was significantly greater for a binding site farther away from the tip of the instrument for both systems (P < .05), and all were greater than 170° (preset in the dedicated motor from manufacturer). The ultimate strength and toughness also increased significantly at levels farther away from the instrument tip (P < .05). All specimens showed typical topographic features of torsional fracture, including the circular abrasion marks and fibrous dimples near the rotation center after the test.<br />Conclusions: It was determined that the 2 brands of reciprocating files are safe when operated at the rotational angle in the proprietary motor.<br /> (Copyright © 2014 American Association of Endodontists. Published by Elsevier Inc. All rights reserved.)
Details
- Language :
- English
- ISSN :
- 1878-3554
- Volume :
- 40
- Issue :
- 10
- Database :
- MEDLINE
- Journal :
- Journal of endodontics
- Publication Type :
- Academic Journal
- Accession number :
- 25260743
- Full Text :
- https://doi.org/10.1016/j.joen.2014.06.002