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Flexibility and torsional resistance of three nickel-titanium retreatment instrument systems
2011; Wiley; Volume: 44; Issue: 8 Linguagem: Inglês
10.1111/j.1365-2591.2011.01876.x
ISSN1365-2591
AutoresRaquel Hussne, Lígia Carolina Moreira Braga, F. L. C. V. Berbert, Vicente Tadeu Lopes Buono, Maria Guiomar de Azevedo Bahia,
Tópico(s)Pelvic and Acetabular Injuries
ResumoInternational Endodontic JournalVolume 44, Issue 8 p. 731-738 Flexibility and torsional resistance of three nickel–titanium retreatment instrument systems R. P. Hussne, R. P. Hussne Department of Restorative Dentistry, School of Dentistry of Araraquara, University of the State of São Paulo, Araraquara, SPSearch for more papers by this authorL. C. Braga, L. C. Braga Department of Restorative Dentistry, Faculty of Dentistry, Universidade Federal de Minas Gerais, Belo Horizonte, MGSearch for more papers by this authorF. L. C. V. Berbert, F. L. C. V. Berbert Department of Restorative Dentistry, School of Dentistry of Araraquara, University of the State of São Paulo, Araraquara, SPSearch for more papers by this authorV. T. L. Buono, V. T. L. Buono Department of Metallurgical and Materials Engineering, School of Engineering, Universidade Federal de Minas Gerais, Belo Horizonte, MG, BrazilSearch for more papers by this authorM. G. A. Bahia, M. G. A. Bahia Department of Restorative Dentistry, Faculty of Dentistry, Universidade Federal de Minas Gerais, Belo Horizonte, MGSearch for more papers by this author R. P. Hussne, R. P. Hussne Department of Restorative Dentistry, School of Dentistry of Araraquara, University of the State of São Paulo, Araraquara, SPSearch for more papers by this authorL. C. Braga, L. C. Braga Department of Restorative Dentistry, Faculty of Dentistry, Universidade Federal de Minas Gerais, Belo Horizonte, MGSearch for more papers by this authorF. L. C. V. Berbert, F. L. C. V. Berbert Department of Restorative Dentistry, School of Dentistry of Araraquara, University of the State of São Paulo, Araraquara, SPSearch for more papers by this authorV. T. L. Buono, V. T. L. Buono Department of Metallurgical and Materials Engineering, School of Engineering, Universidade Federal de Minas Gerais, Belo Horizonte, MG, BrazilSearch for more papers by this authorM. G. A. Bahia, M. G. A. Bahia Department of Restorative Dentistry, Faculty of Dentistry, Universidade Federal de Minas Gerais, Belo Horizonte, MGSearch for more papers by this author First published: 18 March 2011 https://doi.org/10.1111/j.1365-2591.2011.01876.xCitations: 15 Professor Vicente T. L. Buono, Department of Metallurgical and Materials Engineering, Universidade Federal de Minas Gerais, Av. Antonio Carlos, 6627 – Campus Pampulha, Escola de Engenharia – Bloco 2 – sala 2640, 31270-901 Belo Horizonte, MG, Brazil (e-mail: [email protected]). Read the full textAboutPDF ToolsRequest permissionExport citationAdd to favoritesTrack citation ShareShare Give accessShare full text accessShare full-text accessPlease review our Terms and Conditions of Use and check box below to share full-text version of article.I have read and accept the Wiley Online Library Terms and Conditions of UseShareable LinkUse the link below to share a full-text version of this article with your friends and colleagues. Learn more.Copy URL Abstract Hussne RP, Braga LC, Berbert FLCV, Buono VTL, Bahia MGA. Flexibility and torsional resistance of three Nickel–titanium retreatment instrument systems. International Endodontic Journal, 44, 731–738, 2011. Aim To assess the dimensional characteristics, flexibility and torsional behaviour of nickel–titanium retreatment instruments. Methodology Using image analysis software and high-resolution digital images, the instrument length, tip angle, diameter at 3 mm from the tip and the distance between the blades (pitch length) of the following eight instruments were measured (n = 12 for each measurement parameter): the ProTaper Universal retreatment (PTU-R) D1, D2 and D3 instruments; the R-Endo R1, R2 and R3 retreatment instruments; and the Mtwo retreatment (Mtwo-R) sizes 25 and 15 retreatment instruments. Maximum torque and the angular deflection at fracture as well as the bending moment at 45° were measured (n = 12) according to the International Standards Organisation (ISO) specification number 3630-1. Data were analysed using the analysis of variance (α = 0.05). Results The length of the active part of the instruments was found to vary according to the depth of the canal into which they were designed to reach. The pitch length also increased along the active length. The PTU-R D1 and the Mtwo-R instruments had active tips. Measurements of the bending moment at 45° revealed that the Mtwo-R 15 instrument was the most flexible, whereas the PTU-R D1 was the least flexible. The maximum torque tended to increase as the instrument diameter at 3 mm from the tip increased, whereas the angular deflection at fracture varied in the opposite direction. Conclusions The geometrical characteristics of the retreatment instruments and their flexibility and torsion behaviour were consistent with their intended clinical application. Citing Literature Volume44, Issue8August 2011Pages 731-738 RelatedInformation
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