4.7 Article

Surface modification of silica-coated zirconia by chemical treatments

Journal

APPLIED SURFACE SCIENCE
Volume 257, Issue 4, Pages 1228-1235

Publisher

ELSEVIER SCIENCE BV
DOI: 10.1016/j.apsusc.2010.08.029

Keywords

Surface treatment; Hydroxylation; Binding energy; Surface roughness

Funding

  1. University of Hong Kong [200905159006]

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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 3d(5/2) 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 (SiO(2)-ZrO(2)) surfaces had changed to hydrous silica-coated zirconia (SiO(2)-ZrO(2)center dot nH(2)O). 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. (C) 2010 Elsevier B. V. All rights reserved.

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