Effect of oral antiseptics on the corrosion stability of nickel‐titanium orthodontic alloys

• Published in: Materials and corrosion Vol. 69; no. 4; pp. 510 - 518
• Main Authors: Rincic Mlinaric, Marijana, Kanizaj, Lidija, Zuljevic, Damir, Katic, Visnja, Spalj, Stjepan, Otmacic Curkovic, Helena
• Format: Journal Article
• Language: English
• Published: Weinheim Wiley Subscription Services, Inc 01.04.2018
• Subjects: Antiseptics; Archwires; Corrosion; Corrosion effects; Corrosion rate; Corrosion resistance; Corrosion resistant alloys; Dental alloys; Electrochemical impedance spectroscopy; Intermetallic compounds; ion release; Localized corrosion; Nickel base alloys; Nickel titanides; nickel‐titanium; Nitrides; Optical emission spectroscopy; Orthodontics; Protective coatings; Rhodium; Saliva; Spectrum analysis; Titanium; Uniform attack (corrosion)
• DOI: 10.1002/maco.201709797
• ISSN: 0947-5117

The aim was to explore the influence of the interaction of oral antiseptics and various coatings on the corrosion behavior of nickel‐titanium (NiTi) orthodontic alloys. NiTi archwires with uncoated, rhodium‐coated, and nitride‐coated surface were exposed to artificial saliva pH 4.8 at the temperature of 37 °C, and to saliva with the addition of three commercial oral antiseptics (Curaspet, Gengigel, and Listerine). Electrochemical impedance spectroscopy and cyclic polarization were performed. Released nickel and titanium ions after a period of 7 days were measured by inductively coupled optical emission spectroscopy. Results demonstrate that the rate and degree of corrosion mainly increase with the addition of antiseptics. Electrochemical impedance spectroscopy indicates the biggest corrosion resistance in Gengigel. Rhodium‐coated NiTi demonstrates higher corrosion rate in saliva and in all antiseptics than uncoated and nitride‐coated NiTi. The highest tendency toward localized corrosion is seen in rhodium‐coated NiTi in all media, and least in nitride‐coated NiTi. The release of titanium ions mainly supports findings of general corrosion rate. These results indicate that both antiseptics and coating modify corrosion. The aim was to explore the influence of the interaction of oral antiseptics and various coatings on the corrosion behavior of nickel‐titanium (NiTi) orthodontic alloys. NiTi archwires with uncoated, rhodium‐coated, and nitride‐coated surface were exposed to artificial saliva pH 4.8 at the temperature of 37 °C, and to saliva with the addition of three commercial oral antispetics (Curaspet, Gengigel, and Listerine).