Zirconia-Hydroxyapatite Composite Coating on Cp-Ti Implants by Biomimetic Method

Abstract

Hydroxyapatite (HA) is the major component of the natural hard tissues such as teeth and bone. It has been studied extensively as a candidate biomaterial for its use in prosthetic applications. However, the main weakness of this material lies in its poor mechanical strength which makes it unsuitable for load-bearing applications. On the other hand zirconia (ZrO2) powder has been widely studied because of its high strength and fracture toughness and good biocompatibility. Therefore, the addition of zirconia phase into HA will improve the mechanical properties and biocompatibility of HA ceramics. The present study focused on coating of HA-ZrO2 on commercially pure titanium (cp-Ti) using novel biomimetic sol-gel method. The HA-ZrO2 coatings produced with BSG method were exhibited highly crystalline and pure structure. The coating thickness of the samples was not significantly influenced by the change in gelatin concentration and volume. It was concluded that the suggested coating method is a useful method to produce a biomimetic coating layer on the cp-Ti sample surfaces.

Surface Modifications for Implants Lifetime extension: An Overview of Sol-Gel Coatings

“…The data reported show that the sol-gel coatings improve the wear and corrosion resistant as well as the biocompatibility of the substrate. To improve the mechanical properties of the HA coatings, Yoruc et al [58] proposed the synthesis of composites coatings consisting of zirconia (ZrO 2 ) reinforced-HA.…”

The effect of porosity on the mechanical properties of Ti–8Nb–8Zr–8Cu alloy

“…The properties of the implants are improved by modifying their surfaces with various coating methods. For example, antibacterial TiAgN thin film can be coated on Ti by a physical vapor deposition process (PVD) [13], or hard tissue ingredients such as Hydroxyapatite-ZrO 2 can be coated on Ti using the Sol–gel method [14]. However, such improvements are insufficient when the surface of the implant is damaged.…”