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Nanomechanical study of engineered bone tissue -- comparison of elastoplastic and viscoelastic plastic models

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Document pages: 8 pages

Abstract: The elastic-plastic Oliver and phar (OP) models are usually used to study the temporal and spatial changes of mechanical properties of engineering bone. However, since the viscoelastic plastic (VEP) model also allows the evaluation of the viscous composition of bone tissue, the VEP model can be preferred to provide additional insights into the regeneration process. In this work, the elastic modulus (), contact hardness (), hardness () and viscosity index () of newly formed bone tissue regenerated 4 and 12 weeks after implantation of macroporous hydroxyapatite scaffolds in the critical size model of rabbit femur were compared with the mechanical properties of pre-existing bone. The indentation curve was fitted with OP and VEP models. VEP model overview a wider gap between the mechanical properties of native and regenerated tissue when compared to the OP model. In addition, the VEP model indicated an increase of the viscosity index from 4 to 12 weeks, supporting the evidence of a still active regeneration process. The reported results confirmed the higher ability of VEP model compared to the more diffused OP model to provide important insights into bone mechanical properties, also during the bone regeneration process.

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