The Influence of Fin Thread Implant Design on Stress Distribution Comparative FEA StudyFaaiz

Abstract

Background: one of the requirements of long term dental implant success lies within the implant structure and bone- implant interface ability to cope with functional stress. Dental implant ability to withstand different occlusal loads optimizes implant-supported prosthesis function, minimize stress over the surrounding bone, improve osseointegration and reduce the required period for implant loading. One of the areas of research on implant geometry is the thread design. Threads increase initial bone contact, enhance implant stability, maximize implant surface area with subsequent improvement of osseointegration. Recently, Fin Thread (FT) and Modified Fin Thread designs (IBS®) have been introduced. These designs on TiG5 dental implant did not seem to receive adequate attention in the current literature. Methods: four dental implant models (Modified Fin Thread, Fin Thread, V-shaped and Buttress designs) of TiG5 were tested using FEA for stress distribution using normal and extreme static occlusal loads on 0, 15 and 25ο angles. Results: Modified Fin Thread (MFT) design and Fin Thread (FT) design showed almost uniform stress distribution compared to other models under normal occlusal load. However, MFT design showed better stress distribution with no cortical bone involvement in overloaded occlusal stress (200 and 400N) respectively. Conclusion: Modified Fin Thread Design of Ti G5 seems to be the more suitable dental implant model in terms of stress distribution in normal and over occlusal load conditions. MFT designs need clinical studies to support this study findings on patients with long follow up periods.