ABSTRACT
The fixture macro-design is one of the most important factors influencing the implant's primary stability and micro-motion. The aim of this study was to evaluate the peri-implant stress distribution and micro-motion in 2 types of immediately loaded implants in order to determine the best design by using finite element analysis. In this experimental study the accurate pictures of the two fixtures [ILS and Xive] were taken by a digital camera. By using computer simulation technique, a three dimensional finite element model was inserted in a simulated mandibular bone. The displacement and Von Misses stress was recorded after loading. It was found that, the primary stability of ILS was greater [152 micro a] than Xive [284 micro m]. Likewise, ILS exhibited favorable behavior in stress distribution. Moreover, the maximum stress concentration in Xive peri-bone [almost equal to 30MPa] was lesser than Nisastan [almost equal to 37MPa]. The ILS macro-design provides better primary stability and stress distribution, with less stress around the Xive