Antibacterial, antifungal and anticorrosion studies for the effect of hydroxyapatite coating on an orthodontic alloy

• M.F. Khamis and K.A. A Jabar Almakzomi

Al-Farahidi University, College of Dentistry, Orthodontic Department, Baghdad, 10022, Iraq

Abstract: In the current work, an electrochemical deposition procedure was used to establish a hydroxyapatite (HA) coating on an SS orthodontic alloy. SEM and X-ray diffraction (XRD) were used to analyze the produced films. The corrosion behavior of SS in an artificial saliva environment was investigated and characterized using electrochemical polarization and impedance spectroscopy methodologies at temperatures ranging from 293 to 323 K. At temperatures of 313 and 323 K, the protection efficiencies (PE%) reached the highest value (98.6%). Electrochemical impedance spectroscopy (EIS) was used to investigate the double-layer coating, and the results show that the R_ct increased from 1829 Ω·cm² to 15292 Ω·cm² after treatment of the SS with HA by using the electrophoretic deposition (EPD) technique. The morphology and topographic examination by SEM show mostly platelet structures with a small homogenous particle size of ca. 41 nm on average. These results are consistent with data from AFM, with the surface roughness of SS coated with HA of 8.15 nm. The antibacterial and antifungal activities of HA coating against various bacteria and different types of Candida were estimated.

Keywords: orthodontic, stainless steel, wires, brackets, corrosion

Int. J. Corros. Scale Inhib., 2023, 12, no. 1, 205-214
doi: 10.17675/2305-6894-2023-12-1-12

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