The effect of oral antiseptics on the corrosion of nickel–titanium (NiTi) alloys with various coating was investigated. Uncoated, titanium nitride-coated and rhodium-coated NiTi archwires (0.020 × 0.020″) were tested in interaction with artificial saliva pH 4.8 and oral antiseptics based on hyaluronic acid (Gengigel), chlorhexidine (Curasept) and essential oils in alcohol base (Listerine). The dynamics of nickel and titanium ions release were recorded during 28 days. Springback ratio and modulus of resilience were assessed by three-point bending test. The results showed that corrosion of NiTi is related to type of antiseptic mouth rinse and coating formulations. Exposure to an artificial saliva and antiseptics tend to reduce flexibility and resilience of NiTi archwires. The influence of the media is more significant than the influence of the type of the alloys coating. The largest release of nickel ions is in the first 3 days. Antiseptics do not cause further deterioration of the elastic properties in uncoated NiTi compared to saliva. As a result of exposure of nitrified NiTi wires in Listerine, there is bigger release of nickel ions, decrease in elastic properties and lower force delivery in unload. Listerine tends to reduce elastic properties of rhodium-coated wires also. In conclusion, except for Listerine, changes of mechanical characteristics induced by antiseptics are small and would not have a clinically important impact. Generally, Curasept would be the most suitable option.
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We would like to thank Goran Bosanac from Faculty of Food Technology and Biotechnology for his help in analysis.
This study was funded by Croatian Science Foundation-project “Immunological and regenerative implications of corrosion of dental materials in children and adolescents” (Grant Number IP-2014-09-7500).
Conflict of interest
The authors declare that they have no conflict of interest.
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Rincic Mlinaric, M., Karlovic, S., Ciganj, Z. et al. Oral antiseptics and nickel–titanium alloys: mechanical and chemical effects of interaction. Odontology 107, 150–157 (2019). https://doi.org/10.1007/s10266-018-0387-9