Objectives: The purpose of this study was to investigate the effect that the luting agent has on the load to fracture of all-ceramic crown copings. In order to investigate this theory, we compared the load to fracture value of Proceraź sintered Zirconia and Aluminum Oxide copings utilizing two different cements. Materials and Methods: The study consisted of four groups of ten samples each. Two luting agents were selected for the study. Group A was Aluminum Oxide copings luted with 3M Rely X Vitremer luting cement. Group B was Aluminum Oxide copings luted with G.C. FujiCem cement. Group C was Zirconia copings luted with 3M Rely X Vitremer luting. Group D was Zirconia copings luted with G.C FujiCem cement. Forty standardized, grade 2, pre-milled titanium dies were scanned using CAD/CAM technology and a coping fabricated for each die. All copings were luted to their specific die, placed under a static load of 5 Kg for 10 minutes to insure proper seating and stored in 100% humidity for 1 week All samples were visually inspected prior to testing and found to be free of any detectable fractures. Samples were loaded until fracture at the rate of 0.5mm/min. using a universal-testing machine. Results: Group A= 94.41KgF ± 15.91, Group B=148.46KgF ± 31.50, Group C= 152.07KgF ± 21.95, Group D= 218.50KgF ± 32.28. Data was analyzed using an unpaired t-test and indicated that there was a statistical difference between all the groups (P-values >0.0001) except between groups B and C. Conclusion: It was concluded that under the conditions of this study, the load to fracture of aluminum oxide and zirconia copings was significantly increased by the type of luting agent. Supported by University of Michigan Nobel Biocare Center for Excellence.

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