title: Variation of oxide films on titanium induced by osteoblast-like cell culture and the influence of an H2O2 pretreatment.
abstract: Variations of titanium oxide films induced by osteoblast-like cells in a rat calvaria culture system and the influence of an H2O2 pretreatment have been investigated by using X-ray photoelectron spectroscopy and electrochemical impedance spectroscopy. For abraded titanium, the results revealed that phosphate and calcium ions may incorporate into the surface oxide film during the cell culture, forming a precipitate with a Ca/P ratio near that of hydroxyapatite. Oxidized carbon also was found in the surface layer, most likely precipitated hydroxylcarbonated apatite (HCA). The H2O2 pretreatment of titanium in a phosphate-buffered saline solution results in a 10-fold thickened porous oxide film and large amounts of surface hydroxyl groups as well as a certain amount of phosphate ions inside the oxide film. During the cell culture, the H2O2-treated titanium surface favors the ion incorporation and precipitation of the HCA-like compound, which probably is inlaid into the oxide film. Osteoblast-like cells on the H2O2-treated titanium showed a more active morphology during the initial stage compared with cells on abraded titanium. Moreover, bone-like nodule formation and mineralization appear to be related to the precipitation of the HCA-like compound on the surface. The results are discussed with respect to corrosion resistance, ion incorporation and precipitation of the HCA-like compound on the surface, osseointegration, and bioactivity of titanium implants.
authors.affiliation: Department of Materials Science and Engineering, Royal Institute of Technology, Stockholm, Sweden.
authors.forename: J
authors.initials: J
authors.lastname: Pan
authors.forename: H
authors.initials: H
authors.lastname: Liao
authors.forename: C
authors.initials: C
authors.lastname: Leygraf
authors.forename: D
authors.initials: D
authors.lastname: Thierry
authors.forename: J
authors.initials: J
authors.lastname: Li
mesh_terms: D000818:Animals; D002118:Calcium / Q000032:analysis; D002478:Cells, Cultured; D004577:Electron Probe Microanalysis; D006861:Hydrogen Peroxide / Q000494:pharmacology*; D008855:Microscopy, Electron, Scanning; D010006:Osteoblasts / Q000166:cytology*; D051381:Rats; D013499:Surface Properties; D014025:Titanium / Q000737:chemistry*
chemical_list: C009495:titanium dioxide; D006861:Hydrogen Peroxide; D014025:Titanium; D002118:Calcium