Objectives: To introduce a new surface treatment of pre-sintered zirconia silica coating technique, in a trial to improve zirconia-resin bond strength and to evaluate its effect on certain properties of sintered zirconia as regard surface characteristics, flexure strength and fracture toughness.Materials and Methods: A total of 344 pre-sintered zirconia specimens were prepared and divided into three groups: (1) Control (C) (2) Treated before sintering by an innovated silica containing gel (PCT/EG2011/000014) (T) (3) Airborne particle abrasion after sintering (A). Specimens’ surfaces were examined using Scanning Electron Microscopy (SEM) and chemical analyzed with Energy Dispersive X-ray Analysis (EDXA). Crystalline structures were characterized byX-ray Diffraction (XRD). The specimens were tested mechanically for biaxial flexural strength and indentation fracture toughness. The effect of different zirconia surface treatments on the resin cement bond was investigated. Two different dual-cured resin cements were used; one represented the ″non-MDP containing″ resin cement (Variolink II) (V), while the other represented the ″MDP containing″ resin cement (Panavia F 2.0) (P), each without and with silane(+S) application. The bonded specimens were either water stored for 24hours at 37C orthermocycled before shear bond strength measurement.Results: Pre-sintered zirconia showed a porous structure which was obviously reduced after sintering in group C. Presence of glassy layer was evident in groupT. Group A showed surface scratches. Both groups T and A showed higher surface roughness values compared to group C. Elemental analyses of group C and A were found to be mainly zirconia. Other elements were evident in group T. Silica powder used in group T showed an amorphous structure before sintering transferred to cristobalite after sintering, in addition to tetragonal zirconia. After abrasion, monoclinic peaks appeared in group A. Group T showed highest flexural strength, while group A showed highest fracture toughness. After 24hours water storage at 37C, ″Treated +Silane +Panavia″ (TP+S) group showed the highest shear bond strength, then ″Abraded+Panavia″ (AP) and ″Treated+Silane+Variolink″ (TV+S) groups. After thermocycling , all groups debonded spontaneously, except ″Treated+Silane+Panavia″ (TP+S) group ,″Treated+Silane+Variolink″ (TV+S) group and ″Abraded+Panavia″ (AP) group.Conclusions: Pre-sintered zirconia silica coating is an easy effective technique for modifying zirconia surface to improve its bonding to resin cements.