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Effects on Bond Strength between Zirconia and Porcelain according to Etching Treatment and Low Temperature Degradation  

Park, Jin-Young (Department of Health Science Specialized in Dental Laboratory Science and Engineering, Graduate School, Korea University)
Kim, Jae-Hong (Department of Health Science Specialized in Dental Laboratory Science and Engineering, Graduate School, Korea University)
Kim, Woong-Chul (Department of Health Science Specialized in Dental Laboratory Science and Engineering, Graduate School, Korea University)
Kim, Ji-Hwan (Department of Health Science Specialized in Dental Laboratory Science and Engineering, Graduate School, Korea University)
Kim, Hae-Young (Department of Health Science Specialized in Dental Laboratory Science and Engineering, Graduate School, Korea University)
Publication Information
Journal of dental hygiene science / v.14, no.2, 2014 , pp. 140-149 More about this Journal
Abstract
The purpose of this study was to investigate the influence of etching surface treatment and aging treatment of zirconia on the shear bond strength between zirconia core and veneered ceramic. Four groups of zirconia-ceramic specimens were prepared; 1) NEZ group (no etching zirconia), 2) EZ group (etching zirconia), 3) ANEZ group (aging and no etching zirconia), 4) AEZ group (aging and etching zirconia). The shear bond strength between zirconia and porcelain was measured using Instron Universal Testing Machine. Surface texture with crystalline structure of zirconia surface was examined by the field emission scanning electron microscopy (FE-SEM) with ingredient analysis. The fractured surfaces of specimens were examined to determine the failure pattern by a digital microscope. The mean${\pm}$standard deviation of shear bond strengths were $23.47{\pm}3.47$ Mpa in NEZ, $28.30{\pm}4.34$ Mpa in EZ, $21.85{\pm}4.65$ Mpa in ANEZ, $24.65{\pm}3.65$ Mpa in AEZ group, respectively, and were significantly different (p<0.05). The average shear bond strength was largest in EZ group, followed by AEZ, NEZ, and ANEZ groups. Most specimens in NEZ group showed adhesive failure and most specimens in EZ, AEZ, and ANEZ group showed mixed failure. Surface of etching treatment group (EZ and AEZ) showed complex micro-structure and irregular surface texture which may facilitate mechanical interlocking, while untreated zirconia surface presented simpler micro-structure. In conclusion, an etching treatment improved bonding strength between zirconia and porcelain by forming mechanical interlocking.
Keywords
Bond strength; Etching; Low temperature degradation; Zirconia oxide;
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