الفهرس 
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Abstract
The aim of this study was to evaluate the effect of surface treatments
(Hydrofluoric acid and Co2 laser) on the color change and shear bond
strength of ceramic veneers. Twenty rectangular samples with dimensions
(8x8x2) and another twenty samples with smaller dimensions (4x4x2)
were cut from five IPS emax CAD blocks of shade A3. The samples were
divided into 2 groups: 1) Half of the small and large blocks were
subjected to hydrofluoric acid; 2) the other half was subjected to Co2 laser
irradiation. The conditioned samples were subdivided according to the
bonding agent: A) Silane application for 60 seconds; B) Single bond
universal light cured for 10 seconds. Each small sample was cemented on
the top of a large sample using Relyx veneer cement with translucent
shade. The color change was measured using spectrophotometer. The
shear bond strength was tested using a computerized universal testing
machine. The results showed that HF resulted in higher bond shear bond
strength and ΔE than Co2 laser. Single bond universal resulted in higher
shear bond strength values than silane. It was concluded that HF followed
by either single bond universal or silane could be the best surface
treatment for e-max CAD ceramic. However, Co2 laser could be a
promising alternative surface treatment.