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Influence of Low Temperature Degradation on Bond Strength of Yttria-Stabilized Tetragonal Zirconia Polycrystal Core to Veneering Ceramic  

Kim, Ki-Baek (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)
Publication Information
Journal of dental hygiene science / v.14, no.1, 2014 , pp. 29-34 More about this Journal
Abstract
The purpose of this study was to evaluate the influence of low temperature degradation (LTD) on the bonding strength of yttria-stabilized tetragonal zirconia polycrystal (Y-TZP). The push-shear bond test method was used to investigate the core-veneer bonding strength of industrially manufactured Y-TZP core ceramic and manufacturer recommended veneering ceramic. Four groups from ceramic-zirconia specimens (n=28; n=7 per group) were assigned into four experimental aging conditions, namely storage in an autoclave at $134^{\circ}C$ for 0, 3, 5, 10 hours. Bonding strength was obtained using a universal testing machine with crosshead speed 0.5 mm/min. Data were statistically analyzed using one-way ANOVA and Tukey's test (${\alpha}=0.05$). In bonding strength test, the group which was treated with LTD showed lower bonding strength than no treated group. The ceramic-zirconia bonding strength was affected by LTD (p<0.05). Digital microscope examination of the fracture surface showed mixed failures with adhesive and cohesive types in LTD with treated Y-TZP groups.
Keywords
Autoclave; Bonding strength; Low temperature degradation; Yttria-stabilized tetragonal zirconia polycrystal;
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