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Trabecular bone strains around a dental implant and associated micromotions—A micro-CT-based three-dimensional finite element study

Limbert, Georges, van Lierde, Carl, Muraru, O. Luiza, Walboomers, X. Frank, Frank, Milan, Hansson, Stig, Middleton, John and Jaecques, Siegfried (2010) Trabecular bone strains around a dental implant and associated micromotions—A micro-CT-based three-dimensional finite element study Journal of Biomechanics, 43, (7), pp. 1251-1261. (doi:10.1016/j.jbiomech.2010.01.003).

Record type: Article

Abstract

The first objective of this computational study was to assess the strain magnitude and distribution within the three-dimensional (3D) trabecular bone structure around an osseointegrated dental implant loaded axially. The second objective was to investigate the relative micromotions between the implant and the surrounding bone. The work hypothesis adopted was that these virtual measurements would be a useful indicator of bone adaptation (resorption, homeostasis, formation).

In order to reach these objectives, a ?CT-based finite element model of an oral implant implanted into a Berkshire pig mandible was developed along with a robust software methodology. The finite element mesh of the 3D trabecular bone architecture was generated from the segmentation of ?CT scans. The implant was meshed independently from its CAD file obtained from the manufacturer. The meshes of the implant and the bone sample were registered together in an integrated software environment. A series of non-linear contact finite element (FE) analyses considering an axial load applied to the top of the implant in combination with three sets of mechanical properties for the trabecular bone tissue was devised. Complex strain distribution patterns are reported and discussed.

It was found that considering the Young’s modulus of the trabecular bone tissue to be 5, 10 and 15 GPa resulted in maximum peri-implant bone microstrains of about 3000, 2100 and 1400. These results indicate that, for the three sets of mechanical properties considered, the magnitude of maximum strain lies within an homeostatic range known to be sufficient to maintain/form bone. The corresponding micro-motions of the implant with respect to the bone microstructure were shown to be sufficiently low to prevent fibrous tissue formation and to favour long-term osseointegration.

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Published date: 7 May 2010
Keywords: dental implant, trabecular bone, micro-CT, finite element, strain, contact, micromotion
Organisations: Bioengineering Group, Bioengineering Sciences, nCATS Group

Identifiers

Local EPrints ID: 148453
URI: http://eprints.soton.ac.uk/id/eprint/148453
ISSN: 0021-9290
PURE UUID: 65c255fc-0aa3-4fde-b762-98a7d9cde9b4

Catalogue record

Date deposited: 28 Apr 2010 08:24
Last modified: 18 Jul 2017 19:31

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Contributors

Author: Georges Limbert
Author: Carl van Lierde
Author: O. Luiza Muraru
Author: X. Frank Walboomers
Author: Milan Frank
Author: Stig Hansson
Author: John Middleton
Author: Siegfried Jaecques

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