Objectives: The purpose of this study was to investigate the load to fracture values of several all-ceramic crown systems. Methods: Five different coping reinforced all-ceramic crown systems were selected to study. Group A was IPS Eris®, group B was Cerac® In-lab Alumina coping, group C was Cerac® In-lab Zirconia coping, Group D was Procera® AllCeram Alumina coping and group E was Procera® Zirconia coping. Ten crowns from each of the systems were fabricated and luted using G.C. Link Max resin adhesive cement to standardized, grade 2, pre-milled titanium dies. Following cementation, the samples were 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. The samples were then loaded to fracture at the rate of 0.5mm/min. using a universal-testing machine. Results: The load to fracture for each group was as follows; Group A=321.49KgF ± 113.69, Group B=288.63± 102.82, Group C=266.58± 69.17, Group D=295.49± 80.54, Group E=420.37± 82.45. The data was analyzed using a unpaired t-test which indicated that there was a statistical difference between group E and all of the others (P-value >0.039). Conclusions: It was concluded that under the conditions of this study, that the Procera® Zirconia crown system has a significantly higher load to fracture value than several other all-ceramic crown systems. Supported by University of Michigan Nobel Biocare Center for Excellence, University of Michigan Computerized Dentistry Unit, Dental Art Laboratory, Lansing Michigan.

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