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Martensitic transformation of austenitic stainless steel orthodontic wires during intraoral exposure.

Authors :
Izquierdo PP
de Biasi RS
Elias CN
Nojima LI
Source :
American journal of orthodontics and dentofacial orthopedics : official publication of the American Association of Orthodontists, its constituent societies, and the American Board of Orthodontics [Am J Orthod Dentofacial Orthop] 2010 Dec; Vol. 138 (6), pp. 714.e1-5; discussion 714-5.
Publication Year :
2010

Abstract

Introduction: Our purpose was to study the mechanical properties and phase transformations of orthodontic wires submitted to in-vivo exposure in the mouth for different periods of time.<br />Methods: Stainless steel wires were tied to fixed orthodontic appliances of 30 patients from the orthodontics clinic of Universidade Federal do Rio de Janeiro School of Dentistry in Brazil. According to the duration of the clinical treatment, the patients were divided into 3 groups. After in-vivo exposure, the samples were studied by mechanical testing (torsion) and ferromagnetic resonance. Statistical analyses were carried out to evaluate the correlation between time of exposure, mechanical properties, and austenite-to-martensite transformation among the groups.<br />Results: The results were compared with as-received control samples. The torque values increased as time in the mouth increased. The increase in torque resistance showed high correlations with time of exposure (P = 0.005) and austenite-martensite phase transformation.<br />Conclusions: The resistance of stainless steel orthodontic wires increases as the time in the mouth increases; this effect is attributed to the austenite-to-martensite transformation.<br /> (Copyright © 2010 American Association of Orthodontists. Published by Mosby, Inc. All rights reserved.)

Details

Language :
English
ISSN :
1097-6752
Volume :
138
Issue :
6
Database :
MEDLINE
Journal :
American journal of orthodontics and dentofacial orthopedics : official publication of the American Association of Orthodontists, its constituent societies, and the American Board of Orthodontics
Publication Type :
Academic Journal
Accession number :
21130328
Full Text :
https://doi.org/10.1016/j.ajodo.2010.05.015