Influence of substrate surface-grinding on surface roughness of zirconia coatings fabricated by room temperature spray processing
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Zirconia ceramics used for dental implants have low bioactivity. Their surface roughness needs to be enhanced for improvedbone-bonding ability and cell adhesion. Zirconia implants in the gums with low surface roughness have a probabilitydetachment over time. In this study, a zirconia substrate zirconia was coated by a powder via spray processing at roomtemperature (25 oC) to increase its surface roughness. In addition, we investigated the morphology of the as-produced roughsubstrate, including microstructural evolution. Four types of zirconia substrates with different surface texture were fabricatedvia surface-grinding by silicon carbide (SiC) abrasive papers (#220, #400, #800) after sintering. Room temperature sprayprocessing was carried out using a commercial zirconia powder after thermal treatment. The as-produced zirconia coatingsshowed dense microstructure and uniform thickness. Surface roughness of zirconia substrate was greatly enhanced dependingon the surface texture of the substrate. Surface texture by substrate grinding affected coating morphology; however, it did notincrease the surface roughness of the substrate or the coatings. High-roughened coatings and thick coating layer could beobtained from the as-sintered substrate owing to its high surface roughness.
Abstract
Zirconia ceramics used for dental implants have low bioactivity. Their surface roughness needs to be enhanced for improvedbone-bonding ability and cell adhesion. Zirconia implants in the gums with low surface roughness have a probabilitydetachment over time. In this study, a zirconia substrate zirconia was coated by a powder via spray processing at roomtemperature (25 oC) to increase its surface roughness. In addition, we investigated the morphology of the as-produced roughsubstrate, including microstructural evolution. Four types of zirconia substrates with different surface texture were fabricatedvia surface-grinding by silicon carbide (SiC) abrasive papers (#220, #400, #800) after sintering. Room temperature sprayprocessing was carried out using a commercial zirconia powder after thermal treatment. The as-produced zirconia coatingsshowed dense microstructure and uniform thickness. Surface roughness of zirconia substrate was greatly enhanced dependingon the surface texture of the substrate. Surface texture by substrate grinding affected coating morphology; however, it did notincrease the surface roughness of the substrate or the coatings. High-roughened coatings and thick coating layer could beobtained from the as-sintered substrate owing to its high surface roughness.
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