Improvement of bioactivity on zirconia substrate by wollastonite slurry/spin coating
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초록
Zirconia is mainly used as an implant material; however, due to bioinertness, problems, such as falling off or shaking, duringimplant placement arise. In this study, the bioactivity of zirconia was improved by coating the zirconia substrate with awollastonite slurry. Suitable wollastonite slurry was prepared for spin coating by controlling the solid loading, pH, anddispersant. The surface properties of the wollastonite-coated layer, i.e., microstructural evolution, surface morphology,roughness, and phase composition, were dependent on the coating thickness, which are directly related to the number ofcoating cycles. The valuable wollastonite-coated layer was fabricated on the 3Y-TZP substrate by repeating the coating cyclemore than four times. The wollastonite-coated layer comprised an α-phase with a porous structure, and its surface roughnessincreased by more than 10 times for the as-sintered 3Y-TZP substrate. The improvement in the bioactivity of the 3Y-TZPsubstrate by wollastonite coating was confirmed by the results obtained from in vitro test. During the immersion of the SBFsolution, wollastonite dissolution and precipitation of hydroxyapatite particles were observed on the coated surface, indicatingthat the wollastonite surface coating contributed to the improvement in 3Y-TZP bioactivity.
Abstract
Zirconia is mainly used as an implant material; however, due to bioinertness, problems, such as falling off or shaking, duringimplant placement arise. In this study, the bioactivity of zirconia was improved by coating the zirconia substrate with awollastonite slurry. Suitable wollastonite slurry was prepared for spin coating by controlling the solid loading, pH, anddispersant. The surface properties of the wollastonite-coated layer, i.e., microstructural evolution, surface morphology,roughness, and phase composition, were dependent on the coating thickness, which are directly related to the number ofcoating cycles. The valuable wollastonite-coated layer was fabricated on the 3Y-TZP substrate by repeating the coating cyclemore than four times. The wollastonite-coated layer comprised an α-phase with a porous structure, and its surface roughnessincreased by more than 10 times for the as-sintered 3Y-TZP substrate. The improvement in the bioactivity of the 3Y-TZPsubstrate by wollastonite coating was confirmed by the results obtained from in vitro test. During the immersion of the SBFsolution, wollastonite dissolution and precipitation of hydroxyapatite particles were observed on the coated surface, indicatingthat the wollastonite surface coating contributed to the improvement in 3Y-TZP bioactivity.
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