الفهرس 
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Abstract
Aim: The aim of the study to evaluate the effect of different CO2 laser outputs as a laser surface
treatment on the shear bond strength of zirconia to resin cement.
Materials and methods: A total number of 21 zirconia specimens were sliced out of IPS e.max ZirCAD
Prime disc, to obtain specimens having a square shape of 10x10x2 mm dimensions after being sintered
according to manufacturer’s instructions. The total number of specimens were randomly divided equally
into three groups, according to the surface treatment performed; sandblasting using 50μm alumina
particles for 15s, CO2 laser etching with two different outputs; 3W and 4W for 10s, an additional
specimen of same dimensions was retained without any surface treatment. Specimens of different groups
were examined for 3D Surface roughness analysis via digital microscope and Scanning Electron
Microscope, then all specimens were treated with Z-Prime Plus followed by the application of dual-cured
self-adhesive resin cement then light cured for 20s, all specimens were attached to a universal testing
machine and shear bond test was performed with a cross-head speed of 0.5 mm/min.
Results: It was found that there was a statistically significant difference regarding shear bond test
between Sand-blast group and other groups; CO2 laser etching with two different outputs 3W, 4W for
10s and Control group. As the highest mean±SD values were registered for Sand-blast group;
(12.03±1.88 MPa) Regarding Surface roughness test results; The difference among groups was
statistically non-significant.
Conclusion: CO2 laser etching can’t be used as an alternate surface treatment method for sand
blasting, as it couldn’t enhance bond strength of zirconia to resin cement.
Keywords: Laser; Zirconia; CO2; Sand-blast