Stress Distribution in the Mandible Influenced by Nobel Biocare, 3i and Neoss Implant Thread Designs

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Title Stress Distribution in the Mandible Influenced by Nobel Biocare, 3i and Neoss Implant Thread Designs
Author Guan, Hong; Van Staden, Rudi Cobus; Loo, Yew-Chaye; Johnson, Newell Walter; Meredith, N.
Publication Title Proceedings of the Sixth International Conference on Engineering Computational Technology
Editor M. Papadrakakis and B.H.V. Topping
Year Published 2008
Place of publication Stirlingshire, Scotland
Publisher Civil-Comp Press
Abstract The complicated failure mechanisms at the interface between the mandible bone and dental implant, as influenced by the implant design, are investigated in this study. Using the Finite Element Method (FEM), three implant thread designs, namely, Nobel Biocare, 3i and Neoss, are evaluated for their role in the stress distribution within the mandible. The aim of this article is to help advance the use of an innovative engineering approach in dental practices, especially in the understanding of implant failures. The FEM is used to replicate the complex geometric and material properties of the bone and implant. In addition to the various implant thread design, the abutment screw preload as a result of the applied torque is also considered as a variable. The characteristics of von Mises stresses in the cancellous bone are examined for all variables. The assumptions made in the modelling and simulation process include: - a two-dimensional representation of the bone and implant is used because this is considered to be equally accurate and more efficient in terms of computation time, as compared to a three-dimensional approach; - temperature sensitive elements are used to replicate the preload within the abutment screw. This study has demonstrated that the Neoss thread design yields more favourable stress profile within the cancellous bone than the Nobel Biocare and 3i designs. Compared to the Neoss' more smoothed-out thread profile, both the Nobel Biocare and 3i designs have more abrupt changes in geometry, which results in higher stress. This is particularly true for the Nobel Biocare design where a notch is present. Although the existence of the notch helps to promote osseointegration, it on the other hand produces undesirable stresses.
Peer Reviewed Yes
Published Yes
ISBN 978-1-905088-24-9
Conference name Sixth International Conference on Engineering Computational Technology
Location Athens, Greece
Date From 2008-09-02
Date To 2008-09-05
URI http://hdl.handle.net/10072/22546
Date Accessioned 2008-09-11
Date Available 2009-04-17T07:22:07Z
Language en_AU
Research Centre Centre for Infrastructure Engineering and Management; Griffith Health Institute
Faculty Faculty of Science, Environment, Engineering and Technology
Subject PRE2009-Biomechanical Engineering
Publication Type Conference Publications (Full Written Paper - Refereed)
Publication Type Code e1

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