title: Surface characteristics and bioactivity of oxide film on titanium metal formed by thermal oxidation.
abstract: In this study, we characterized the surface of oxide film formed on titanium metal through the use of thermal treatment and investigated the effect of surface characteristics on the bioactivity of titanium. The as-received sample group was prepared by polishing and cleaning CP-Ti as a control group, and thermally oxidized sample groups were prepared by heat treating at 530, 600, 700, 800, 900, and 1000 degrees C respectively. Micro-morphology, crystalline structure, chemical composition, and binding state were evaluated using FE-SEM, XRD, and XPS. The bioactivity of sample groups was investigated by observing the degree of calcium phosphate formation from immersion testing in MEM. The surface characterization tests showed that hydroxyl group content in titanium oxide film was increased, as the density of titanium atoms was high and the surface area was large. In MEM immersion test, initial calcium phosphate formation was dependent upon the thickness of titanium oxide, and resultant calcium phosphate formation depended on the content of the hydroxyl group of the titanium oxide film surface.
authors.affiliation: Department of Dental Materials and Dental Materials Research Institute, School of Dentistry, Chonnam National University, Gwangju, 500-757, Korea. yjpark@chonnam.ac.kr
authors.forename: Yeong-Joon
authors.initials: YJ
authors.lastname: Park
authors.forename: Ho-Jun
authors.initials: HJ
authors.lastname: Song
authors.forename: In
authors.initials: I
authors.lastname: Kim
authors.forename: Hong-So
authors.initials: HS
authors.lastname: Yang
mesh_terms: D001672:Biocompatible Materials / Q000737:chemistry*; D002130:Calcium Phosphates / Q000737:chemistry; D003460:Crystallization; D004577:Electron Probe Microanalysis; D017665:Hydroxyl Radical / Q000737:chemistry; D008855:Microscopy, Electron, Scanning; D053758:Nanoparticles; D010084:Oxidation-Reduction; D010087:Oxides / Q000737:chemistry*; D010316:Particle Size; D013329:Structure-Activity Relationship; D013499:Surface Properties; D013696:Temperature; D014025:Titanium / Q000737:chemistry* / Q000378:metabolism*; D014961:X-Ray Diffraction
chemical_list: D001672:Biocompatible Materials; D002130:Calcium Phosphates; D010087:Oxides; D017665:Hydroxyl Radical; C020243:calcium phosphate; D014025:Titanium