Wollastonite spin coating on zirconia substrate by solgel method
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A wollastonite coating layer was fabricated on a zirconia substrate via a sol-gel method to improve the bioactivity of 3Y-TZP—a bioinert material. Initially, the coated wollastonite surface possessed a porous microstructure; however, the coated area andfilm thickness increased proportionally with the increasing number of coating cycles. Furthermore, it was observed that denseand thin coating layers were formed on the zirconia substrate after one or two coating cycles; however, after three or fourcoating cycles, it was observed that porous and thick coating layers were formed on the zirconia substrate. The surfaceroughness depended on the thickness of the wollastonite coating layer, which increased with the increasing number of coatingcycles. An in vitro test was conducted, wherein a wollastonite-coated specimen was immersed in a simulated body fluid solutionfor 14 days. The test results revealed that new hydroxyapatite particles precipitated and covered the surface of the wollastonitecoating layer, thus confirming that the wollastonite coating layer significantly improved the bioactivity of zirconia, comparedto the pure zirconia surface.
Abstract
A wollastonite coating layer was fabricated on a zirconia substrate via a sol-gel method to improve the bioactivity of 3Y-TZP—a bioinert material. Initially, the coated wollastonite surface possessed a porous microstructure; however, the coated area andfilm thickness increased proportionally with the increasing number of coating cycles. Furthermore, it was observed that denseand thin coating layers were formed on the zirconia substrate after one or two coating cycles; however, after three or fourcoating cycles, it was observed that porous and thick coating layers were formed on the zirconia substrate. The surfaceroughness depended on the thickness of the wollastonite coating layer, which increased with the increasing number of coatingcycles. An in vitro test was conducted, wherein a wollastonite-coated specimen was immersed in a simulated body fluid solutionfor 14 days. The test results revealed that new hydroxyapatite particles precipitated and covered the surface of the wollastonitecoating layer, thus confirming that the wollastonite coating layer significantly improved the bioactivity of zirconia, comparedto the pure zirconia surface.
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