This study was intended to evaluate the fracture resistance and fracture mode of three units fixed dental prostheses (FDP) fabricated of Porcelain-Veneered Zirconia (PVZ) and High-Translucency Zirconia (HTZ). Material and methods: A total of 20 standardized three-unit zirconium dioxides FDP were made. These were divided into two groups10 FDP in each group. One group of FDP frameworks made of porcelain veneered zirconia PVZ (control group), second group of FDP framework made of high translucent zirconia HTZ. All samples were artificially aged then loaded until fracture occurred using a universal-testing machine . The mode of fracture was determined using a stereomicroscope. Results: Independent t-test showed significant differences in fracture loads between the two groups. The HTZ group showed higher fracture loads (mean= 1390 N) compared to the PVZ group (mean = 950 N) (p-value < 0.001). The fracture concentrated at connector region of both group. Conclusion: Both types of Zirconia persistent the pragmatic fracture load which may be deemed clinically adequate. Keywords translucent zirconia, conventional veneer z6
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