Objective: The aim of this investigation is to evaluate the fracture resistance and final translucency of different all ceramic implant-supported abutment-crown combinations. Material and Methods: Twenty customized CAD/CAM zirconia abutments were constructed. The abutments were divided into two groups. The first group was designed to form a cement retained restoration to be restored with all-ceramic superstructures (feldspathic, lithium disilicate and zirconia crowns). While the second, was designed into a screw retained restoration (integrated abutment-crown) to be directly veneered. The control group constituted of titanium abutments restored with veneered zirconia crowns. The abutment-crown combinations were tested for fracture resistance after undergoing a chewing simulation of 1.25x106 cycles, to simulate 5-years of intraoral function. In addition, the final translucency of the various abutment-crown complexes was measured and compared. Result: The cement retained groups restored with monolithic glass ceramic crowns (feldspathic and lithium disilicate crowns) were the most translucent, while the cement retained group restored with zirconia crowns and the screw retained directly veneered group were the least translucent. The results demonstrated a statistically insignificant effect of the abutment design; and the type of superstructure on the fracture resistance of the abutment crown combinations