Objective: The aim of this study was to investigate the effect of two types of surface treatment on the bond strength of two ceramic materials.Materials and methods: A total of forty disc shaped samples were constructed to obtain 20 twin samples; samples were divided into two equal groups according to the type of ceramic material; Group I: Leucite reinforced feldspathic ceramic material (IPS Empress). Group II: Lithiumdisilicate ceramic material (IPS Empress II). Each ceramic group was further subdivided into two equal subgroups according to surface treatment used into; Subgroup A: etched with 9% Hydrofluoric acid gel. Subgroup B: Sandblasting with Al2O3 (100μ) followed by 9% Hydrofluoric acid etching.Silane coupling agent (Monobond plus) was applied to all samples. Scanning electron microscope (SEM) was employed before cementation of twin samples to assess the surface topography created by each surface treatment.Adhesive resin cement (Variolink II) was applied to the treated surfaces to cement each twin samples together from each surface treatment groups using a special cementing device constructed for this study. Shear bond strength test was performed using universal testing machine at a crosshead speed of 0.5mm /min. All data were collected; tabulated and statistically analyzed.Scanning electron microscope (SEM) was employed to examine the fractured samples and determine the mode of failure for each ceramic group.Results: IPS Empress II ceramic group with sandblasting and etching surface treatment recorded the highest shear bond strength mean value(55.76 MPa), while etched IPS Empress Group recorded the lowest bond strength of all ceramic groups (34.45 MPa). There was a significant influence of the ceramic material (Empress II> Empress I) tested on shear bond strength mean values, where a non-significant influence of surface treatment (sandblasting +etching> etching) type on shear bond strength mean values was recorded.Conclusion: Both ceramic materials types and surface treatment regimens influenced the bond strength values of the two ceramic materials tested. IPS Empress II showed the best bond strength results than IPS Empress regardless the surface treatment regimen.