The Effect of Fixture Neck Design in a Realistic Model of Dental Implant: A Finite Element Approach

The aim of this work is to develop an accurate finite element model able to reproduce a standard experimental set-up for the evaluation of mechanical failure of a dental implant system. The considered system is composed of a fixture, an abutment and a connecting screw. We analysed the behaviour of t...

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Bibliographic Details
Published in:	Computer methods in biomechanics and biomedical engineering Vol. 6; no. 5-6; pp. 289 - 297
Main Authors:	Necchi, Silvia, Migliavacca, Francesco, Gastaldi, Dario, Pizzagalli, Manuela, Del Fabbro, Massimo, Weinstein, Roberto, Pietrabissa, Riccardo, Dubini, Gabriele
Format:	Journal Article
Language:	English
Published:	England Taylor & Francis GroupAbingdon, UK 01-10-2003
Subjects:	Computer Simulation Computer-Aided Design Contact Dental implant Dental Implants Dental Prosthesis Design - methods Dental Restoration Failure Equipment Failure Analysis - methods Finite Element Analysis Finite element method Mathematical model Models, Theoretical Motion Reproducibility of Results Sensitivity and Specificity
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Summary:	The aim of this work is to develop an accurate finite element model able to reproduce a standard experimental set-up for the evaluation of mechanical failure of a dental implant system. The considered system is composed of a fixture, an abutment and a connecting screw. We analysed the behaviour of the implant system considering three different designs of the fixture, in order to establish which one provides the better mechanical behaviour. After the definition of the numerical models, loading conditions were selected in order to reproduce the same stress state found in previous mechanical failure tests. Preloading and functional loading conditions were simulated. The analysis of the numerical results shows that the structure yielding is due to the fixture neck plastic deformation, that increases the load eccentricity and then the bending stress on the connecting screw. Only slight differences were found between the three implant systems in the amount and distribution of stress. The model reproduces properly the implant systems and the experimental set-up. The goodness of the model can be summarised as: realistic geometrical structure, elastoplastic model for the material description, correct definition of the contacts and the existing tolerance among the different system components, reproduction of the preloading stress condition. The present study permitted to define a valid procedure for the realization of numerical models of implant systems.
Bibliography:	ObjectType-Article-2 SourceType-Scholarly Journals-1 ObjectType-Feature-1 content type line 23 ObjectType-Article-1 ObjectType-Feature-2
ISSN:	1025-5842 1476-8259
DOI:	10.1080/10255840310001646301