Survival statistics were calculated and Weibull modulus was measured from fitted load-cycle-failure diagrams. The remaining crowns were subjected to 3.7 million chewing cycles (load range 50–200 N at 3 s interval) in a custom made pneumatic fatigue tester. Initial fracture strength of half of the specimens was calculated using one cycle load to failure in a universal testing machine. The manufactured crowns were cemented on standardized resin dies using a resin adhesive (Panavia F2.0). IPS e.max CAD and IPS Zir CAD were milled into 0.5 mm thick anatomically shaped core structure which received standardized press-on veneer ceramic. Materials and methodsĬAD/CAM anatomically shaped crowns were manufactured using two resin infiltrated ceramics (Lava Ultimate and Vita Enamic), two reinforced glass ceramic milling blocks ( IPS Empress CAD and IPS e.max CAD) and a veneered zirconia core ( IPS Zir CAD).
To evaluate influence of cyclic fatigue on two resin infiltrated ceramics and three all-ceramic crowns manufactured using CAD/CAM technology.
