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

JOURNAL OF BIOMECHANICS

卷:43

Article

Limbert, Georges^1,2,3,4  van Lierde, Carl⁵  Muraru, O. Luiza^6,9  Walboomers, X. Frank⁷  Frank, Milan²  Hansson, Stig⁸  Middleton, John¹  Jaecques, Siegfried⁶ 

[1] Cardiff Univ, Wales Coll Med, Sch Dent, Biomech & Biomat Res Ctr, Cardiff CF14 4XY, Wales

[2] FIRST Numer Ltd, Cardiff Medictr, Cardiff CF14 4UJ, S Glam, Wales

[3] Univ Southampton, Sch Engn Sci, Natl Ctr Adv Tribol Southampton, Southampton SO17 1BJ, Hants, England

[4] Univ Southampton, Sch Engn Sci, Bioengn Sci Res Grp, Southampton SO17 1BJ, Hants, England

[5] Materialise NV, B-3001 Louvain, Belgium

[6] Catholic Univ Louvain, BMGO, B-3001 Louvain, Belgium

[7] Radboud Univ Nijmegen, Med Ctr, Dept Periodontol & Biomat, NL-6500 HB Nijmegen, Netherlands

[8] Astra Tech AB Aminogatan 1, SE-43121 Molndal, Sweden

[9] MOBILAB, B-2440 Geel, Belgium

关键词: Dental implant;    Trabecular bone;    Micro-CT;    Finite element;    Strain;    Contact;    Micromotion;   

DOI  :  10.1016/j.jbiomech.2010.01.003

来源: Elsevier

【 摘 要 】

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 mu 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 mu 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 pen-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. (C) 2010 Elsevier Ltd. All rights reserved.

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