Rainville, Louis2023-02-162023-02-162022-12https://hdl.handle.net/11299/252464University of Minnesota M.S. thesis. December 2022. Major: Dentistry. Advisor: Heather Conrad. 1 computer file (PDF); vii, 88 pages.The purpose of this study is to compare designs of partially veneered 3Y-TZP zirconia crowns, quantify the fracture and ultimate compressive loads and define the failure patterns. A premolar was prepared with a 1mm reduction. The die was duplicated, 30 specimens were fabricated and divided in 3 groups (n=10): Group A – Control (PFZ), Group B – Experimental #1 (Veneer) and Group C – Experimental #2 (Window). Zirconia copings were fabricated with manually layered porcelain. The crowns were cemented onto the dies using resin cement and the specimens were tested under axial loading. The mean FL were 1538.40N (A), 2025.33N (B) and 2266.03N (C), and the mean UCL were 1554.42N (A), 2032.85N (B) and 2279.39N (C). 26/29 specimens underwent core fracture, and 3/29 specimens experienced adhesive veneer fracture. In conclusion, there were statistical differences between the control and the experimental groups, but not between the experimental groups.en3Y-TZPDesignsFracturePFZPorcelainZirconiaThesis or Dissertation