Synergetic effect of essential oils and calcium phosphate nanoparticles for enhancement the corrosion resistance of titanium dental implant.

Calcium phosphate (CaPO(4)) coating is one of various methods that is used to modify the topography and the chemistry of Ti dental implant surface to solve sever oral problems that result from diseases, accidents, or even caries due to its biocompatibility. In this work, anodized (Ti-bare) was coated by CaPO(4) prepared from amorphous calcium phosphate nanoparticles (ACP-NPs) and confirmed the structure by X-ray diffraction (XRD) and Fourier-transform infrared spectroscopy (FT-IR) techniques. Ti-bare was coated by prepared CaPO(4) through the casting process, and the morphology of Ti/CaPO(4) was characterized by scanning electron microscope (SEM) where the nano-flakes shape of CaPO(4) and measured to be 60 ~ 80 nm was confirmed. The stability of Ti-bare and coated Ti/CaPO(4) was studied in a simulated saliva solution using electrochemical impedance spectroscopy (EIS) and linear polarization techniques to deduce their corrosion resistance. Furthermore, three essential oils (EO), Cumin, Thyme, and Coriander, were used to stimulate their synergistic effect with the CaPO(4) coat to enhance the corrosion resistance of Ti implant in an oral environment. The fitting EIS parameters based on Rs [R(ct)C]W circuit proved that the charge transfer resistance (R(ct)) of Ti/CaPO(4) increased by 264.4, 88.2, and 437.5% for Cumin, Thyme, and Coriander, respectively, at 2% concentration.