In Vitro Corrosion Behavior of Lingual Orthodontic Archwires. (22nd May 2011)

• Record Type: Journal Article
• Authors: Suárez, Carlos; Vilar, Teresa; Sevilla, Pablo; Gil, Javier
• Other Names: Ke W. Academic Editor.
• Is Part Of: International journal of corrosion. Volume 2011(2011)
• Publication Date: 2011-05-22
• Subjects: Corrosion and anti-corrosives -- Periodicals; Corrosion and anti-corrosives; Periodicals; 620.11223
• DOI: 10.1155/2011/482485
• Languages: English
• ISSNs: 1687-9325

Abstract

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 E pit around −600 mV, and those of titanium alloys showed E pit 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.