Effect of Different Surface Treatments on Shear Bond Strength of Zirconia Based Ceramic and Veneering Porcelain | ||
| Mansoura Journal of Dentistry | ||
| Article 7, Volume 7, Issue 2, April 2020, Pages 32-38 PDF (316.06 K) | ||
| Document Type: Original Article | ||
| DOI: 10.21608/mjd.2020.199106 | ||
| Abstract | ||
| Aims of the study: Aim of this in-vitro study was to evaluate the shear bond strength of veneering ceramic to Y-TZP infrastructures after different surface conditioning techniques. Material and Methods: 43 Y-TZP blocks were cut from pre-sintered zirconia disks. Specimens were divided into 4 groups (n=10 in each group) according to the surface conditioning technique used (Diamond grinding, Al2O3 air-borne particle abrasion, Silica containing glass-ceramic liner application and Nd:YAG Laser irradiation). 3 of the specimens were used for optimization of Nd:YAG Laser surface conditioning. Lithium disilicate veneer layers were pressed on each Y-TZP specimen. Shear bond strength was tested using a universal testing machine. All specimens of each group were examined for failure mode analysis using an optical microscope. Scanning Electron Microscope (SEM) was used to detect the roughness produced over Y-TZP block surface after different surface conditioning techniques and X-ray diffraction test (XRD) for phase transformation determination. Analysis of the data was done using one-way Analysis of variance (ANOVA) test. Results: Silica-containing glass ceramic liner application and Nd:YAG Laser irradiation resulted in a significantly higher SBS (p≤0.05) than did Diamond grinding and Al2O3 air-borne particle abrasion. Diamond grinding and Al2O3 air-borne particle abrasion groups showed more adhesive failure than mixed failure in contrast to Silica containing glass ceramic and Nd:YAG Laser irradiation groups which showed more mixed failure than adhesive failure. SEM revealed great surface irregularities at the Nd:YAG laser irradiated group. XRD test revealed that Al2O3 was the only conditioning technique which resulted in monoclinic phase transformation in contrast to the other conditioning techniques used. Conclusion: Silica containing glass ceramic liner application and Nd:YAG Laser surface conditioning could be considered valuable means of shear bond strength improvement between Y-TZP core and lithium disilicate veneering layer. | ||
| Keywords | ||
| Y-TZP; Lithium disilicate; shear bond strength; surface conditioning techniques | ||
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