Assessment of the electrochemical behaviour of Nickel-Titanium-based orthodontic wires: Effect of some natural corrosion inhibitors in comparison with fluoride

Abstract

Background The aim of this study is to assess the corrosion resistance behaviour of Nickel-Titanium-based orthodontic wires (NiTi) in different concentrations of Sodium Fluoride (NaF) and the corrosion’s inhibitory effect of the extracts of some medicinal plants (essential oils, hydrosols and extract). Material and Methods In this study we used NiTi (3M) and CuNiTi (ORMCO, 35°C, California) orthodontic wires. The following electrolytes were prepared: Lactate Ringer solution with additions of 0.1%, 0.5% or 1% of Sodium Fluoride and the extracts of different plants: Artemisia, Syzygium aromaticum (Clove) and Celtis australis. Corrosion resistance was studied using anodic potentiodynamic polarisation and electrochemical impedance spectroscopy measurements. At the end of the experiment, microscopic images of wires were performed. ANOVA test with the comparison of Bonferroni and Tukey tests were performed to elucidate comparisons among all groups. Results The higher sodium fluoride concentration is related to negative corrosion potential for both NiTi and CuNiTi orthodontic wire. Hydrosols are associated to positive values of corrosion potential. CuNiTi has a lower corrosion resistance than NiTi. Conclusions The prescription of toothpastes containing sodium fluoride should be reduced especially for patients wearing fixed orthodontic appliances. Eugenol may be considered as alternative of sodium fluoride for orthodontic patients for its anti-microbial and anti-corrosive effects. Key words: Corrosion behaviour, Sodium Fluoride, Nickel-Tatanium, orthodontic wires, corrosion inhibitors, aromatical plants.

Chitosan’s effects on the acidity, copper ion release, deflection, and surface roughness of copper-nickel-titanium archwire

“…1,32 However, some mouthwashes have been reported to cause the release of ions and decrease corrosion resistance. 34,35 This study observed that copper ion release from the CuNiTi orthodontic archwire in Group B (2% chitosan, which simulated a mouthwash) was lower than that of the control.…”

Corrosion of copper nickel titanium archwire in chlorhexidine, sodium fluoride, and chitosan mouthwashes

“…NaF content in perioKin ® (CHX-NaF) mouthwash can increase the metal ions released from the CuNiTi orthodontic wire. Heravi et al found that the NaF content in mouthwash solution would decrease the corrosion resistance of NiTi and CuNiTi wires as the NaF concentration increased (Heravi, Hadi Moayed and Mokhber, 2015;Fatene et al, 2019). Sabah and Jarjees also reported that the interaction between fluoride and titanium might cause destruction to the metal coating of the archwires and degrade the mechanical properties (Sabah, Jarjees and Awni, 2011).…”

“…HF degrades the protective oxide layers on the surface, which leads to corrosion (Castro et al, 2015;Hafez et al, 2011;Lü et al, 2009;Marques et al, 2012;Suárez et al, 2010). But there are several published studies on the corrosion resistance of NiTi alloys in saliva and NaF solutions even with increasing concentrations of fluorides (Heravi, Hadi Moayed and Mokhber, 2015;Mirhashemi, Jahangiri and Kharrazifard, 2018;Fatene et al, 2019).…”

Corrosion of copper nickel titanium archwire in chlorhexidine, sodium fluoride, and chitosan mouthwashes

“…HF degrades the protective oxide layers on the surface, which leads to corrosion (Castro et al, 2015;Hafez et al, 2011;Lü et al, 2009;Marques et al, 2012;Suárez et al, 2010). But there are several published studies on the corrosion resistance of NiTi alloys in saliva and NaF solutions even with increasing concentrations of fluorides (Heravi, Hadi Moayed and Mokhber, 2015;Mirhashemi, Jahangiri and Kharrazifard, 2018;Fatene et al, 2019).…”