ZIRCONIA BONDING SOLUTION
Specimen Preparation and Shear Bond Strength Test
A cylindrical metal mold having an inner diameter of 6 mm and a thickness of 3 mm was placed on the surface-treated zirconia disc. Self-adhesive resin cement (MAZIC CEM, Vericom, Anyang, Korea) with 10- methacryloyloxydecyl dihydrogen phosphate (MDP) was filled in the metal mold (8 mm outer diameter, 6 mm inner diameter, and 3 mm height) and light cured for 20 seconds on the side and 20 seconds from the top. After light curing, all specimens were stored in distilled water at room temperature for 24 hours before shear bond strength test. Shear bond strength test was performed using a testing machine (OUT-05, Oriental TM Corp., Gyenonggi-do, Korea) at a constant crosshead speed 1.0 mm/ min until failure (Fig. 1).
Fig. 1. Schematic figure of the shear bond test procedure.
SPSS software ver. 25.0 (SPSS Inc., Chicago, USA) was used for the statistical analysis and all measured values were evaluated with the 5% of the level of significance. Surface roughness values were analyzed by the Kruskal-Wallis tests with post hoc pairwise Mann-Whitney analyses. And the results of the shear bond strength were analyzed using one-way analysis of variance (ANOVA) and Tukey’s post-hoc test.
Surface roughness images of each experimental group captured by SEM were shown in Fig. 2. The control group showed a typical untreated surface and the test groups showed increasing surface roughness with irregularity.
Fig. 2. The result of surface morphology analysis. Captured images of each experimental groups by SEM (original magnification ×5000): (A) Control, (B) ZA15, (C) ZA30, (D) ZA50.
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