저온열화현상이 지르코니아 코어와 전장도재의 전단결합강도에 미치는 영향
Influence of Low Temperature Degradation on Bond Strength of Yttria-Stabilized Tetragonal Zirconia Polycrystal Core to Veneering Ceramic
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초록
The purpose of this study was to evaluate the influence of low temperature degradation (LTD) on the bonding strength of yttria-stabilized tetragonalzirconia polycrystal (Y-TZP). The push-shear bond test method was used to investigate the core-veneer bonding strength of industriallymanufactured Y-TZP core ceramic and manufacturer recommended veneering ceramic. Four groups from ceramic-zirconia specimens (n=28; n=7per group) were assigned into four experimental aging conditions, namely storage in an autoclave at 134oC for 0, 3, 5, 10 hours. Bonding strengthwas obtained using a universal testing machine with crosshead speed 0.5 mm/min. Data were statistically analyzed using one-way ANOVA andTukeyʼs test (α=0.05). In bonding strength test, the group which was treated with LTD showed lower bonding strength than no treated group. Theceramic-zirconia bonding strength was affected by LTD (p＜0.05). Digital microscope examination of the fracture surface showed mixed failureswith adhesive and cohesive types in LTD with treated Y-TZP groups.
Abstract
The purpose of this study was to evaluate the influence of low temperature degradation (LTD) on the bonding strength of yttria-stabilized tetragonalzirconia polycrystal (Y-TZP). The push-shear bond test method was used to investigate the core-veneer bonding strength of industriallymanufactured Y-TZP core ceramic and manufacturer recommended veneering ceramic. Four groups from ceramic-zirconia specimens (n=28; n=7per group) were assigned into four experimental aging conditions, namely storage in an autoclave at 134oC for 0, 3, 5, 10 hours. Bonding strengthwas obtained using a universal testing machine with crosshead speed 0.5 mm/min. Data were statistically analyzed using one-way ANOVA andTukeyʼs test (α=0.05). In bonding strength test, the group which was treated with LTD showed lower bonding strength than no treated group. Theceramic-zirconia bonding strength was affected by LTD (p＜0.05). Digital microscope examination of the fracture surface showed mixed failureswith adhesive and cohesive types in LTD with treated Y-TZP groups.
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