Nitinol corrosion under force stresses in simulated physiological fluid with and without fluorides

  • Nerly Deyanira Montanez-Supelano Universidad Industrial de Santander
  • Darío Yesid Peña-Ballesteros Universidad Industrial de Santander
  • Ronel Cardozo Universidad Santo Tomás
  • Martha Faria Universidad Santo Tomás
  • Bayron Hernán Montero-Viveros Universidad Santo Tomás
  • Gisseth Sánchez Universidad Santo Tomás
  • Erika Zambrano Universidad Santo Tomás
Keywords: Nickel-titanium alloy, Fluorides, Corrosion, Electrochemical techniques

Abstract

Introduction: nickel-titanium (nitinol) wires may potentially corrode oral environments causing biocompatibility problems. The purpose of this study was to compare the behavior of corrosion of nitinol wires in artificial saliva with different levels of pH, fluoride concentration, and tension degrees. Methods: an experimental study applying four electrochemical techniques: corrosion potential, linear polarization resistance, Tafel curves, and electrochemical impedance spectroscopy. Samples were cemented on teeth simulating different crowding degrees (56 gf and 224 gf) at various levels of fluoride concentration (0% and 0.5%) and pH (4 and 7). Results: the corrosion strength values for a sample submerged at pH 4, 0% NaF during 5 hours is lower for a force of 224 gf than for 56 gf. When the electrolyte is added a concentration of 0.5% sodium fluoride, it increases polarization resistance for a force of 224 gf. Conclusions: this study confirmed the existence of oxides on the nickel-titanium surface, especially on the arch exposed for 14 days to pH 4 and 0.5% NaF.

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Author Biographies

Nerly Deyanira Montanez-Supelano, Universidad Industrial de Santander
Chemical Engineer, MSc in Materials Engineering. Universidad Industrial de Santander. Bucaramanga, Colombia
Darío Yesid Peña-Ballesteros, Universidad Industrial de Santander
Metallurgical Engineer, PhD in Corrosion. Professor at the Universidad Industrial de Santander. Bucaramanga, Colombia 
Ronel Cardozo, Universidad Santo Tomás
DMD, Specialist in Orthodontics. Universidad Santo Tomás, School of Dentistry, Bucaramanga, Colombia. 
Martha Faria, Universidad Santo Tomás
DMD, Specialist in Orthodontics. Universidad Santo Tomás, School of Dentistry, Bucaramanga, Colombia 
Bayron Hernán Montero-Viveros, Universidad Santo Tomás
DMD, Specialist in Orthodontics. Universidad Santo Tomás, School of Dentistry, Bucaramanga, Colombia 
Gisseth Sánchez, Universidad Santo Tomás
DMD, Specialist in Orthodontics. Universidad Santo Tomás, School of Dentistry, Bucaramanga, Colombia 
Erika Zambrano, Universidad Santo Tomás
DMD, Specialist in Orthodontics. Universidad Santo Tomás, School of Dentistry, Bucaramanga, Colombia. 

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Published
2016-12-16
How to Cite
Montanez-Supelano N. D., Peña-Ballesteros D. Y., Cardozo R., Faria M., Montero-Viveros B. H., Sánchez G., & Zambrano E. (2016). Nitinol corrosion under force stresses in simulated physiological fluid with and without fluorides. Revista Facultad De Odontología Universidad De Antioquia, 28(1), 54-70. https://doi.org/10.17533/udea.rfo.v28n1a3