Objective: It has been previously shown that cementation of all-ceramic restorations increases the fracture resistance of the over-all restoration. The purpose of this study was to determine if that theory could be applied to the new experimental ProceraŽ sintered Zirconia Y-TZP coping. Method: To begin investigating this question, a study was completed testing the ultimate compressive strength of ProceraŽ Zirconium copings cemented with two different luting agents. Three test groups were selected. The copings were cemented utilizing PVS as the control (group A), 3M Rely X Vitremer luting (Group B) and G.C. Fuji Plus (Group C). The samples were all cemented to standardized, grade 2, pre-milled titanium dies and stored in 100% humidity for 10 weeks. Samples were visually inspected prior to testing to insure that there were no detectable fractures. The samples were loaded to fracture at the rate of 0.5mm/min using the universal-testing machine, provided the following Results: Results: The mean ultimate compressive strength was: A=34.66KgF +4.93KgF S.D., B=75.99KgF +7.67KgF (SD), C=111.26 KgF+13.38kgF (S.D.). Fisher's PLSD test was applied to the data and indicated that there was a statistical difference between all three groups. Vitremer versus PVS (P .0002) and Fuji Plus versus PVS (P <.0001). Conclusion: It was concluded that under the conditions of this study, the ultimate compressive strength of the experimental ProceraŽ sintered Zirconia Y-TZP coping is significantly increased by both luting agents with Fuji Plus providing a significantly higher compressive strength. Supported by University of Michigan Nobel Biocare Center for Excellence.

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