الفهرس 
INTRODUCTIONOnly 14 pages are availabe for public view
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Abstract
The biomechanical behavior of dental implants differs from that of natural tooth which results in subsequent complications. The mechanism of stress distribution and load transfer to the implant/bone interface is a critical issue affecting the success rates of implants. This study aimed to evaluate the difference in stress/ strain distribution in the bone surrounding implants resulting from the use of three different superstructure materials using strain gauge analysis. Polyurethane test block was used as a bone alternative. Two bone level implants were inserted through a surgical guide into the blocks. Three-unit FPD frameworks were fabricated using three materials: group I: CAD/CAM BioHPP, group II: CAD-CAM zirconia and group III: Metal (Co-Cr alloy) framework FPDs. Vertical occlusal load was applied gradually at a constant rate of 1N per second up to a maximum of 150 N. The resulting strain around Implants was measured by strain gauge device. The lowest mean (SD) micro-strain value was recorded for group I: BioHpp, followed by group II: zirconia, and the highest mean micro-strain value was found in group III: Metal (Co-Cr alloy). One way ANOVA test was applied showing a statistically significant difference between group I (BioHPP) and group III (Metal (Co-Cr alloy)). However, no statistically significant difference was found between group I (BioHPP) and group II (zirconia). It was concluded that using BioHPP as a more resilient superstructure material in implant supported prosthesis has a positive effect on decreasing the stresses generated around dental implant, this effect was statistically significant comparing BioHPP to metal (Co-Cr alloy), but it was statistically not significant comparing BioHPP to zirconia.