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International Journal of Corrosion
Volume 2011 (2011), Article ID 482485, 9 pages
http://dx.doi.org/10.1155/2011/482485
Research Article

In Vitro Corrosion Behavior of Lingual Orthodontic Archwires

1Department of Orthodontics, Université de Genève, Switzerland
2Departament d'Odontoestomatologia, Facultat d'Odontologia, Universitat de Barcelona, c/Feixa Llarga, s/n, 08907 L'Hospitalet de Llobregat, Spain
3Departament de Ciència dels Materials i Enginyeria Metallúrgica, Escola Tècnica Superior d'Enginyeria Industrial, Universitat Politècnica de Catalunya, Avenida Diagonal, 647, 08028 Barcelona, Spain

Received 11 September 2010; Revised 24 January 2011; Accepted 16 March 2011

Academic Editor: W. Ke

Copyright © 2011 Carlos Suárez et al. 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.

Abstract

Objectives. To investigate the in vitro electrochemical corrosive behavior of archwires used in lingual orthodontics and the effects on the phase transition temperatures. Materials and Methods. Six different types of archwires of stainless steel, titanium-molybdenum, nickel-titanium and nickel-titanium-copper were used. Corrosion tests were performed following ISO-standard 10993-15:2000. Differential scanning calorimetry and scanning electron microscopy were used. Results. The stainless steel archwires showed an Epit around −600 mV, and those of titanium alloys showed Epit values around 1000 mV. Differential scanning calorimetry detected a rhombohedral phase in nickel-titanium archwires, while it was not detected in nickel-titanium-copper wires. A difference of 2°C to 3.5°C from the manufacturer's claim was found in the as-received and polarized samples, respectively. Conclusions. The 0.016 stainless steel archwires were found to be the less resistant to corrosion. A rhombohedral phase was detected on the nickel-titanium archwires. No major differences were observed among groups concerning phase transformation temperatures.