J Clin Exp Dent. 2019 May 1;11(5):e414-e420. doi: 10.4317/jced.55601. eCollection 2019 May.

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

니켈티타늄 기반 교정용 와이어의 전기화학적 특성평가: 불소와 비교한 자연부식 방해물질의 효과

Fatene N¹, Mansouri S², Elkhalfi B³, Berrada M⁴, Mounaji K⁵, Soukri A⁶.

Author information

1

Orthodontist, private practice, PhD student, Physiopathology molecular genetics and biotechnologies laboratory, Faculty of Sciences Ain Chock, Center of Health & Biotechnology, Hassan II University, Casablanca, Morocco.

2

PhD student, LIMAT-Thermostructural Materials and Polymers Team, Center of Health & Biotechnology, Faculty of science Ben M'sik, Hassan II University, Casablanca, Morocco.

3

Assistant professor, Physiopathology molecular genetics and biotechnologies laboratory, Center of Health & Biotechnology, Faculty of Sciences Ain Chock, Hassan II University, Casablanca, Morocco.

4

Professor, Ben Msik Analysis Center, Faculty of Sciences Ben Msik, Center of Health & Biotechnology, Hassan II University, Casablanca, MMorocco.

5

Professor, Physiopathology molecular genetics and biotechnologies laboratory, Faculty of Sciences Ain Chock, Center of Health & Biotechnology, Hassan II University, Casablanca, Morocco.

6

Professor, director of Physiopathology Molecular Genetics and Biotechnologies laboratory, Faculty of Sciences Ain Chock, Center of Health & Biotechnology, Hassan II University, Casablanca, Morocco.

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.

고정성 교정장치를 하고 있는 환자에게 불소를 함유한 치약의 처방을 줄여야 한다.

불소가 교정장치 부식의 원인이 되기 때문

Key words:Corrosion behaviour, Sodium Fluoride, Nickel-Tatanium, orthodontic wires, corrosion inhibitors, aromatical plants.