Dose-Dependent Effects of CeO on Microstructure and Antibacterial Property of Plasma-Sprayed TiO Coatings for Orthopedic Application.

Titanium and its alloys have been used extensively for orthopedic and dental implants. Although these devices have achieved high rates of success, two major complications may be encountered: the lack of osseointegration and the biomaterial-related infection. Accordingly, cerium oxide (CeO)-doped titanium oxide (TiO) materials were coated on titanium by an atmospheric plasma spraying (APS) technique. The phase structures, morphologies, and surface chemical states of the obtained coatings were characterized by x-ray diffraction, scanning electron microscopy, and x-ray photoelectron spectroscopy techniques. The in vitro antibacterial and cytocompatibility of the materials were studied with Staphylococcus aureus ( S. aureus, ATCC25923) and osteoblast precursor cell line MC3T3-E1. The results indicated that the addition of CeO shifts slightly the diffraction peaks of TiO matrix to low angles but does not change its rutile phase structure. In addition, the CeO/TiO composite coatings possess dose-dependent corrosion resistance and antimicrobial properties. And doping of 10 wt.% CeO exhibits the highest activity against S. aureus, improved corrosion resistance, and competitive cytocompatibility, which argues a promising option for balancing the osteogenetic and antibacterial properties of titanium implants. [ABSTRACT FROM AUTHOR]