11th CAD/CAM & Digital Dentistry International Conference

Poster Presentation: Biomechanical behavior of all-ceramic crowns based on different stress analyses

The trend for development of all-ceramic crowns is a field of constant investigation. High strength zirconia core can be manufactured through CAD/CAM technology and subsequently veneered conventionally. While zirconia provides strength, the clinical success of these restorations has been hampered by fractures within the veneering porcelain. The focus of the studies was on the framework design and how different designs may influence possible biomechanical failures, using varied stress distribution analyses. For the experimental analyses, different posterior teeth were chosen in order to simulate the biomechanical behavior of these teeth restored with zirconia - all-ceramic crowns. Static structural analyses were performed in order to calculate equivalent and principal stress distribution. Under the same loading conditions, the stress distribution patterns for the zirconia all-ceramic crown using differential stress analyses exhibited similarities, only the values were different and they should be reported to the Yield, a respective tensile strength of the materials, and also design parameters. The present study suggests that varied simulation methods are promising to assess the biomechanical behavior of all-ceramic crowns. (This work was supported by a grant of the Romanian National Authority for Scientific Research and Innovation CNCS-UEFISCDI, project number PN-II-RU-TE-2014-4-0476)