Abstract
The effect of the die materials on the fracture strength of CAD/CAM monolithic ceramic crowns was studied in this research. Three different types of die materials (dentin, Ni-Cr alloy, epoxy resin) were prepared. The monolithic crowns were fabricated using a CAD/CAM System; CEREC 4. The CAD/CAM crowns were cemented to dies using a resin cement. The specimens were tested under compressive load at a crosshead speed of 1 mm/min using a universal testing machine until fracture occurred. Recorded data were statistically analyzed using one-way analysis of variance and LSD Post hoc tests (p=0.05). While CAD/CAM crowns on Ni-Cr alloy dies showed the highest fracture resistance values, CAD/CAM crowns on dentin dies showed the lowest fracture resistance values. There is no significant difference between groups statistically. Ni-Cr alloy and epoxy resin dies could be used alternatively instead of teeth for in vitro studies
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