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Improvement of the Mechanical Properties of Calcium Phosphate Bone Substitutes by Polycaprolactone Infiltration

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Abstract:

In this study we show that mechanical properties of bioceramic scaffolds can be significantly improved by repeated infiltration with a low-viscosity polycaprolactone solution. Biphasic calcium phosphate (BCP: 70% hydroxyapatite, 30% β-tricalcium phosphate) scaffolds characterized by a bimodal pore size distribution and a global porosity of 70% have been chosen as starting materials. Polymer content in the ceramic scaffold was varied so that an inorganic/organic ratio close to that of bone may be achieved. Work of fracture at maximum stress was 36 J/m2 for the ceramic scaffold alone and reached 127 J/m2 for the 8-times infiltrated samples. These results are superior to the ones previously obtained with polycaprolactone infiltrated alumina due to higher micropore content. We show that during bending tests, polycaprolactone phase formed fibrils while the crack propagated. Crack bridging by polycaprolactone ensured the integrity of the composite once the ceramic scaffold was broken and directly involved in the composite toughening. Because of its composition, microstructure and mechanical behavior of this kind composite can be an interesting candidate for bone substitution.

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Periodical:

Key Engineering Materials (Volumes 361-363)

Pages:

403-406

DOI:

https://doi.org/10.4028/www.scientific.net/KEM.361-363.403

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Online since:

November 2007

Authors:

Marion Quiquerez, Marianna Peroglio, Laurent Gremillard, Jérôme Chevalier, Laurent Chazeau, Catherine Gauthier, Thierry Hamaide, Aurélien Bignon

Keywords:

Calcium Phosphate Ceramic, Composite, Hydroxyapatite (HAP), Mechanical Property, Polycaprolactone, Porosity

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© 2008 Trans Tech Publications Ltd. All Rights Reserved

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