Surface modification of silica-coated zirconia by chemical treatments |
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| Authors: | Christie Ying Kei Lung |
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| Institution: | a Dental Materials Science, Faculty of Dentistry, The University of Hong Kong, Hong Kong SAR, PR China
b Department of Physics and Astronomy, Faculty of Mathematics and Natural Sciences, University of Turku, Finland |
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| Abstract: | Zirconia surface modification by various chemical treatments after silica coating by sandblasting was investigated in this study. The surface of silica-coated dental zirconia was hydroxylated by treatment with different acids at room temperature for 4 h, rinsed with deionized water and air-dried. The modified surfaces were characterized by X-ray photoelectron spectroscopy (XPS) and atomic force microscopy (AFM). Shifts in binding energies for Zr 3d5/2 and Si 2p peaks were observed after treatment with acids, thereby showing a change in the chemical states of zirconium and silicon on the surface layer of silica-coated zirconia. The XPS analysis revealed that the silica-coated zirconia (SiO2-ZrO2) surfaces had changed to hydrous silica-coated zirconia (SiO2-ZrO2·nH2O). One-way ANOVA analysis revealed there was significant difference in both surface roughness parameters of silica-coated zirconia after chemical treatments and the surface topography varied depending on the acid treatment. |
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| Keywords: | Surface treatment Hydroxylation Binding energy Surface roughness |
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