Electrochemical impedance spectral study on the corrosion resistance of orthodontic wire made of Ni-Ti alloy immersed is artificial saliva in the presence of beer an alcoholic drink

Abstract

To regulate tooth alignment, dentists use orthodontic wires made of materials such as SS 316L and Ni-Cr alloys. These wires are exposed to corrosive environments within the oral cavity, including artificial saliva, food items, beverages, and orally administered medications. This study investigates the corrosion resistance of Ni-Ti alloy in artificial saliva (AS), both in the absence and presence of beer—an alcoholic beverage produced by yeast fermentation of malt and flavored with hops—using polarization techniques. The results indicate that the corrosion resistance of the Ni-Ti alloy improves in the presence of beer. This is evidenced by an increase in charge transfer resistance, impedance, and phase angle, along with a decrease in double-layer capacitance when the alloy is immersed in AS containing beer. These effects are attributed to specific ingredients present in beer. The findings suggest that individuals using orthodontic wires made of Ni-Ti alloy can consume beer without concern for corrosion-related degradation of the material. Surface morphology was examined using scanning electron microscopy (SEM) and contact angle measurements.