Abstract
BackgroundThe 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 MethodsIn 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.ResultsThe 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.ConclusionsThe 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.
Highlights
IntroductionWires of nickel and titanium, nitinol (which contains about 50% of nickel and titanium), are the most used in orthodontics due to their interesting mechanical properties [1]
Wires of nickel and titanium, nitinol, are the most used in orthodontics due to their interesting mechanical properties [1]
CuNiTi 35°C orthodontic wire is used in the DAMON system with self-ligating brackets to reduce the coefficient of attrition observed in conventional technique leading to a reduction of the number of visits and a protection of the passive layer at the surface of the wire [3]
Summary
Wires of nickel and titanium, nitinol (which contains about 50% of nickel and titanium), are the most used in orthodontics due to their interesting mechanical properties [1]. Number of studies on the corrosion resistance of orthodontic wires have been conducted [1,4,5,6,7] Even though these wires develop a protective oxide layer on their surface, there is a metal ion release in oral cavity [8]. The purpose of our 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 plants (essential oils, hydrosols and extract) as alternatives to fluoride. 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).
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