| Wollastonite coating on zirconia substrate by room temperature spray processing |
Yu Hyeon Yun, Jong Kook Lee
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| Department of Materials Science and Engineering, Chosun University, Gwangju 61452, Korea |
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Received: September 22, 2021; Revised: November 22, 2021 Accepted: December 15, 2021. Published online: May 31, 2022. |
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| ABSTRACT |
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Dental implant materials must exhibit excellent mechanical and biochemical properties, such as high strength, corrosion resistance, nontoxicity, biocompatibility, and phase stability. Zirconia implants manufactured by CAD/CAM machining and the sintering process have low bone-bonding ability owing to bioinertness and low surface roughness, resulting in prolonged implantation period or implant debinding. In this study, bioactive wollastonite was coated on bioinert zirconia substrates by room temperature spray processing, and the microstructural and characteristics of the coated layers were investigated. Wollastonite powder for the coatings was prepared through calcination and pulverization processes. Homogeneous wollastonite coatings on dense zirconia substrates were obtained via the aforementioned room temperature spray processing. Notably, the phase composition and microstructural characteristics of wollastonite-coating layers were dependent on the number of coating cycles. The wollastonite-coating layers showed a uniform thickness and tough surface microstructure, depending on the number of deposition cycles and coating thickness. In vitro tests of the coated specimens in an SBF solution at pH 7.4 for 14 days revealed that the biological activity of the zirconia substrate changed depending on the thickness and surface morphology of the coatings. As a result, the wollastonite coating surfaces exhibit superior bioactivity compared with that of the original zirconia substrate. This is owing to the bioactive wollastonite phase and high surface roughness of the coated layer. |
| Key words:
Wollastonite · Zirconia substrate · Spray coating · Biological activity |
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