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KMID : 0362220110380040279
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Journal of The Korean Research Society for Dental Materials
2011 Volume.38 No. 4 p.279 ~ p.286
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Effect of Surface Treatment Condition on Bond Strength between CAD/CAM Zirconia and Veneering Ceramics
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Jeon Woo-Yong
Shin Jae-Woo
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Abstract
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The purpose of this study was to investigate the effect of the surface treatment conditions on the bond strength between CAD/CAM zirconia and veneering ceramics. The debonding/crack initiation strengths between zirconia and veneering ceramics were measured according to ISO9693. To investigate the surface roughness changes with blasting pressure, zirconia plates were blasted with 70 μm alumina at pressure range from 2 .5 a tm t o 4.5 atm. E ighty zirconia p lates, 2 4.0 mm × 3.0 mm × 0.5 mm, were made with five CAD/CAM zirconia blocks, sandblasted with 70 μm alumina at 2.5 atm, and equally divided into two groups. One group (BHA) was heat-treated at 1000℃ for 10 minutes after acid-etching with 5 wt% HF solution for 10 minutes. Another group (BAH) was acid-etched with 5 wt% HF solution for 10 minutes after heat-treatment at 1000℃ for 10 minutes. Four different veneering ceramics of Cerabien CZR (CB), Lava Ceramic (LC), ICE Zirkon Ceramic (ZC) and Zirmax (ZM) were sintered on zirconia plates. The three point flexural test was performed at crosshead speed 1.5 mm/min. Zirconia surface blasted with 70 μm alumina abrasives showed the rough surface by eliminating the grains. Arithmetical average roughness value Ra of the zirconia surface blasted at 2.5 atm with 70 μm alumina abrasives was 0.304±0.036 μm which showed the significant difference with the group blasted at 3.5 atm. Maximum bond strength of 35.3 MPa was obtained at ZC group and the ZC and LC groups showed the significant differences with the CB and ZM groups. The debonding/crack initiation strengths between blasted zirconia and veneering ceramics were not significantly different with acid etching and heat treatments before and after monoclinic-tetragonal transformation.
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KEYWORD
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Acid-etching, Blasting pressure, CAD/CAM zirconia, Debonding/crack initiation strengths, Heat treatment
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