Purpose :The aim of this study was to compare between Monolithic Translucent Zirconia (Y-TZP) and IPS E.max press in marginal fit and fracture strength. Materials and methods, forty ceramic crowns were fabricated, Then divided into 4 groups: Group A: Ten monolithic TZI CAD/CAM zirconia crowns N=10 Group B: Ten monolithic IPS E.max press crowns N=10, Group C: Ten veneered ZI CAD/ CAM zirconia core N=10, Group D: Ten veneered IPS E.max press core N=10,then Each group was subdivided into two subgroups: Subgroup 1: Samples not subjected to thermocycling N=5 as control. Subgroup 2: Samples subjected to thermocycling N=5 The samples were cemented to corresponding epoxy resin dies. The marginal fit was measured and scanned with digital microscope. The fracture strength of the restorations were measured by using universal testing machine with a load 5 KN. The obtained data were collected, tabulated and statistically analyzed. Results: The results of marginal fit showed that the vertical marginal gap values of all groups were within the clinically acceptable range. While the Results of fracture resistance showed that fracture strength of monolithic translucent Y-TZP is (3484.28 N) considerably higher than monolithic IPS E.max press (1515.45 N), followed by veneered ZI zirconia (1483.84 N), and finally veneered IPS E.max press (1091.64 N) after thermocycyling. Conclusions: It was found that veneered crown groups recorded lower gap mean values than monolithic groups. The monolithic crown groups recorded higher fracture load mean values than veneered groups. Monolithic translucent Y-TZP zirconia crowns seem to be a promising treatment alternative, especially for patient with a history of fractured restoration.
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