الفهرس 
Fracture resistance of machined ceramic crowns bonded to endodontically treated molars with two planes versus flat occlusal preparation designs
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Abstract
This study was designed to evaluate the effect of the occlusal surfacepreparation design of endodontically treated molars on the stress distribution and fracture resistance of ceramic crown-tooth system.A total of twenty lower molars were endodontically treated. Core build-up was then carried out using composite restoration and all teeth were prepared to receive all-ceramic crowns.Teeth were divided into two groups according to the occlusal preparation design as follows: group I (T): Prepared teeth with two planes occlusal surface. group II (F): Prepared teeth with flat occlusal surface.All samples’ crowns were constructed from lithium disilicate ceramic blocks (IPS e.max CAD) using the CEREC CAD/CAM system.All samples were subjected to fracture resistance test on a universal testing machine. All the data were collected, tabulated and statistically analyzed. Microscopic examination of fractured samples was carried out using the stereomicroscope and the scanning electron microscope to determine modes of failure.Stress distribution was evaluated by 3D Finite element analysis test. 3D digital model was generated by CBCT scanning and Reverse engineering.The components of the model were assembled using Solidworks software and then imported in ANSYS software to carry out the analysis