Influence of Vicks ginger candy (VGC) and Glucose D on corrosion resistance of orthodontic wire made of Ni-Ti alloy in artificial saliva

• N. Anitha¹, S.P. Seeli¹, S.A. Ratthika¹, V.D. Mary¹, A.M.A. Deena¹, S. Rajendran^1,2 and Gurmeet Singh³

¹ Department of Chemistry, Corrosion Research Centre , St. Antony’s College of Arts and Sciences for Women, 624005 Dindigul, India
² Adjunct Professor, Pondicherry University, 605014 Puducherry, India
³ Vice Chancellor, Pondicherry University, 605014 Puducherry, India

Abstract: Orthodontic wires are used by dentists to regulate the growth of teeth of their patients. They are always in contact with the saliva and they undergo corrosion in the oral environment. Orthodontic wires made of various alloys are used. Nickel- and titanium-based alloys are promising materials for dental orthodontic wires due to their superior mechanical properties and corrosion resistance. Influence of Vicks ginger candy (VGC) and Glucose D on corrosion resistance of orthodontic wire made of Ni-Ti alloy (Nitinol) in artificial saliva has been evaluated by electrochemical studies such as polarization technique and AC impedance spectra. Corrosion resistance of Nitinol alloy in artificial saliva increases in the presence of 1000 ppm of Vicks ginger candy (VGC). Hence people clipped with orthodontic wire made of Ni-Ti alloy need not hesitate take 1000 ppm of Vicks ginger candy (VGC) orally. Corrosion resistance of Ni-Ti alloy in artificial saliva decreases in the presence of 1000 Glucose D. Therefore, the chances of orthodontic wire undergoing corrosion are greater in those who consume Glucose D juice excessively. Hence people clipped with orthodontic wire made of Ni-Ti alloy should avoid taking Glucose D orally. In the presence of 1000 ppm of Vicks ginger candy (VGC), LPR value of Ni-Ti alloy increases and corrosion current decreases. Vicks ginger candy (VGC) controls the anodic reaction and cathodic reaction to an equal extent. This is due to the fact that in the presence of Vicks ginger candy (VGC), the shift in corrosion potential is very small (from –535 to –549 mV vs. SCE). In the presence of 1000 ppm of Glucose D, the corrosion resistance of Ni-Ti alloy (Nitinol) in AS decreases. This is revealed by the fact that, in the presence of 1000 ppm of Glucose D, LPR value of Ni-Ti alloy decreases and corrosion current increases. Glucose D controls the anodic reaction predominantly. This is due to the fact that in the presence of Glucose D, the shift in corrosion potential is towards the anodic side (from –535 to –456 mV vs. SCE).

Keywords: artificial saliva, corrosion, orthodontic wires, candies, Vicks ginger, Glucose D, electrochemical studies

Int. J. Corros. Scale Inhib., 2022, 11, no. 1, 339-352
doi: 10.17675/2305-6894-2022-11-1-20

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