The effect of fixture neck design in a realistic model of dental implant : a finite element approach
Articolo
Data di Pubblicazione:
2003
Citazione:
The effect of fixture neck design in a realistic model of dental implant : a finite element approach / S. Necchi, F. Migliavacca, M. Pizzagalli, M. Del Fabbro, R. Weinstein, G. Dubini. - In: COMPUTER METHODS IN BIOMECHANICS AND BIOMEDICAL ENGINEERING. - ISSN 1025-5842. - 6:5-6(2003), pp. 289-297. [10.1080/10255840310001646301]
Abstract:
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.
Tipologia IRIS:
01 - Articolo su periodico
Keywords:
Contact; Dental implant; Finite element method; Mathematical model
Elenco autori:
S. Necchi, F. Migliavacca, M. Pizzagalli, M. Del Fabbro, R. Weinstein, G. Dubini
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