Aim of the study: The aim of the present study was to investigate the effect of two surface treatments (alumina blasting and silica coating using Cojet system) of ziconia ceramic on the bond strength to two luting cement materials (adhesive resin cement and resin modified glass ionomer cement). An vitro study.Materials and Methods: Forty zirconia ceramic discs (6 mm in diameter and 2mm in thickness), were constructed from prefabricated zirconia ceramic blocks using the Zirkon Zahn CAD/CAM system and Zirkon Zahn scanning machine with its scanning Software. A total of 20 zirconia ceramic samples(40 discs) were divided according to the type of surface treatment used into two groups: Group (1): contains (10 pairs of disc samples) subjected to alumina blasting. Group (2): contains (10 pairs of disc samples) subjected to silica blasting using (Cojet). Each group was further subdivided according to the type of cement used into two subgroups.Subgroup (a):contains10 ceramic discs (5pairs) bonded together using adhesive resin cement. Subgroup (b): contains 10 ceramic discs (5pairs) bonded together using resin modified glass-ionomer.Results: Multilink N cement with Cojet surface treatment showed the statistically significantly highest mean shear bond strength. This was followed by Multilink N with sandblasting. Fuji Plus cement with Cojet surface treatment showed significantly lower mean shear bond strength. Fuji Plus with sandblasting showed the statistically significantly lowest mean shear bond strength value.Conclusion: Within the limitations of this study, the following conclusions were drawn:1) Surface treatment of zirconia ceramics had a significant effect on the zirconia-cement shear bond strength.2) Cementation of zirconia ceramics using resin modified glass ionomer cement produced lower shear bond strength compared to adhesive resin cement.3) The use of adhesive resin cement with Cojet system provided a successful method for increasing zirconia-cement shear bond strength.