الفهرس 
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Abstract
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SUMMARY
In implant dentistry literature, the commonly used materials in FEA studies can be classified as either implant, peri-implant bone (cortical and cancellous bone), and restoration. This method allows application of simulated forces at specific points in the system and stress analysis in the peri-implant region and surrounding structures. The implant connection system and other factors as the prosthesis type, length and material of restoration have a great effect on stresses falling on the bone around implant.
The aim of the present study was to evaluate and calculate the stress distribution with finite element analysis between implant in optimum apicocoronal position and implant in 6 mm vertical defect as well as between Internal Hex and Morse Taper connections.
In this study, the stresses falling on the surrounding bone, abutment, fixture and screw were analyzed in two different configurations. In the first configuration, the jawbone has no defects. It is composed starting from the top of the bone, of 1 mm layer of crestal cortical bone, 3.5 mm layer of cancellous bone, 0.5 mm sinus cortical bone and a bottom layer of graft bone. In the second configuration, a vertical bone defect was created. The
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implants examined throughout this study were titanium implants with Morse taper and internal hex connections.
Results demonstrated that the stress distribution was more in implant in 6 mm vertical defect than optimum apicocoronal position. Furthermore, Morse taper connections showed less stresses on the bone, abutment, fixture and screw than the internal Hex connections regardless of the bone height.