Abstract
Brittle break downs are typical failures of ceramic materials. Chipping problems associated with all-ceramic zirconia restorations are studied and discussed at the moment. Factorial analysis showed that material and thickness of prosthetic crowns are of primary importance in stress magnitude. Laboratory tests such as finite element analysis (FEA) may help to predict the behaviour of different restorations during biomechanical simulation. The aim of this study was to evaluate by FEA stresses in all-ceramic crowns in regard to different veneer thicknesses. For the experimental analysis a first upper premolar was chosen. A static structural analysis was performed to calculate the stress distribution from different coping designs. FEA may help to predict the behaviour of all-ceramic bilayer crowns during biomechanical simulation. FEA investigations show that a constant veneering thickness of 1-1.8 mm doesn't affect the stress distribution and maximal stress values in the teeth structures and restorations.
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