الفهرس 
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Abstract
Objective: The aim of the current study was to evaluate the effect of different surface treatments on the shear bond strength of two types of ceramic materials. Materials and methods: forty- two ceramic discs with 8 mm diameter and 2 mm thickness were fabricated and divided into two equal groups (n=21) according to the type of ceramic used : lithium disilicate glass ceramic (IPS e.max press) using lost wax and heat pressed technique and monolithic zirconia (zircon biostar) using CAD/CAM technology. Each group was subdivided into three subgroups (A,B and C) (n=7) according to the surface treatments used (AL2O3 ,Silica coating, CO2 laser). Adhesive resin cement was applied on all ceramic specimens. The shear bond strength was measured with Universal testing machine. The data were collected and analyzed using Student t-test, One-way ANOVA. Results: Revealed that the highest mean value of the surface roughness was for alumina with both ceramic types and the lowest was for CO2 laser in both ceramic types. For the shear bond strength the highest mean value was for alumina with Zirconia, while the lowest value was for carbon dioxide with Zirconia. Conclusions: Within the limitations of this in-Vitro study the following conclusions could be obtained; Air abrasion by Al2O3 particles can increase the surface roughness in order to enhance the bonding by micromechanical retention between ceramic and resin cement. Zirconia demonstrated higher shear bond strength than IPS e. max press.