Effects of Different Laser Treatments on Some Properties of the Zirconia-Porcelain Interface

[摘要] Introduction: This study was performed to compare the effect of Fractional CO2 laser or Q switchedNd:YAG laser of surface treatment on the shear bond strength of zirconia-porcelain interface.Methods: Fractional CO2 laser at 30 W, 2 ms, time interval 1 ms, distance between spots 0.3 mm,and number of scans is (4) or Q switched Nd:YAG laser at 30 J/mm2 and 10 Hz were used to assessthe shear bond strength of zirconia to porcelain. Pre-sintered zirconia specimens were divided intothree groups (n = 10) according to the surface treatment technique used: (a) untreated (Control)group; (b) CO2 group; (c) Nd:YAG group. All samples were then sintered and veneered withporcelain according to the manufacturer’s instructions. Surface morphology was examined usinga light microscope, the surface roughness test was done by the atomic force microscope (AFM),and the shear bond strength (SBS) test was done by a universal testing machine. After debondingfollowing shear bond test, zirconia surfaces were examined under a light microscope to determinetheir fracture mode.Results: The Results of this study showed that the lowest SBS was recorded in the control group,and the highest SBS recorded in the Fractional CO2 group, followed by the Q switched Nd:YAGlaser group, as well as an increase in surface roughness and change in the morphology and mode offailure in the experimental groups .Conclusion: This study shows that Fractional CO2 laser and Q switched Nd:YAG laser treatmentssignificantly increase the bond strength than untreated zirconia.

[学科分类] 基础医学

[关键词] Nd:YAG laser;Fractional CO2 laser;Shear bond strength;Zirconia;Porcelain