engleski

Effect of oral antiseptics on the corrosion and mechanical properties of nickel-titanium orthodontic wires

Aim: To evaluate the effect of oral antiseptics on the corrosion and mechanical properties of nickel-titanium wires, depending on the wire’s surface treatment. Materials and Methods: Uncoated, rhodium-coated and nitrified NiTi wires were immersed in artificial saliva (pH value 4.8) during 28 days, incubated at 37°C. Every week, for a period of 5 minutes, wires were taken out of artificial saliva and immersed in antiseptic agents based on chlorhexidine (Curasept), essential oils (Listerine) and hyaluronic acid (Gengigel). One set of every wire type was immersed only in artificial saliva, and served as negative control. The as-received wires were used as absolute control. Mechanical properties were measured by a 3-point bend test, at 37°C. The corrosion resistance was measured by electrochemical impedance spectroscopy. Electrochemical testing was performed in the solution prepared from equal volumes of oral antiseptics and artificial saliva, at 37°C. ANOVA was used for statistical analysis. Results: Oral antiseptics and artificial saliva had similar effect on the mechanical properties of all three wire types. Listerine and Gengigel caused greater decrease in spring back ratio and moduli of resilience during unload, when compared to Curasept (p<0.05). The Gengigel caused the highest corrosion resistance in all wires. The rhodium-coated wires had lowest corrosion resistance in Curasept, and uncoated and nitrified NiTi wires in Listerine. Corrosion resistance was partially related to the working properties. Conclusion: Reduction of the corrosion resistance and mechanical properties make Listerine least favourable as additional oral hygiene product, when the NiTi wires are employed.

NiTi wires; oral antiseptics; corrosion; mechanical properties

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