title: The influence hydroxyapatite nanoparticle shape and size on the properties of biphasic calcium phosphate scaffolds coated with hydroxyapatite-PCL composites.
abstract: We developed a composite biphasic calcium phosphate (BCP) scaffold by coating a nanocomposite layer, consisting of hydroxyapatite (HA) nanoparticles and polycaprolactone (PCL), over the surface of BCP. The effects of HA particle size and shape in the coating layer on the mechanical and biological properties of the BCP scaffold were examined. Micro-computerized tomography studies showed that the prepared scaffolds were highly porous (approximately 91%) with large pore size (400-700 microm) and an interconnected porous network of approximately 100%. The HA nanoparticle (needle shape)-composite coated scaffolds displayed the highest compressive strength (2.1 +/- 0.17 MPa), compared to pure HA/beta-TCP (0.1 +/- 0.05 MPa) and to the micron HA - composite coated scaffolds (0.29 +/- 0.07 MPa). These needle shaped scaffolds also showed enhanced elasticity and similar stress-strain profile to natural bone. Needle shaped coated HA/PCL particles induced the differentiation of primary human bone derived cells, with significant upregulation of osteogenic gene expression (Runx2, collagen type I, osteocalcin and bone sialoprotein) and alkaline phosphatase activity compared to other groups. These properties are essential for enhancing bone ingrowth in load-bearing applications. The developed composite scaffolds possessed superior physical, mechanical, elastic and biological properties rendering them potentially useful for bone tissue regeneration.
authors.affiliation: Biomaterials and Tissue Engineering Research Unit, School of AMME, The University of Sydney, Sydney 2006, Australia.
authors.forename: Seyed-Iman
authors.initials: SI
authors.lastname: Roohani-Esfahani
authors.forename: Saied
authors.initials: S
authors.lastname: Nouri-Khorasani
authors.forename: Zufu
authors.initials: Z
authors.lastname: Lu
authors.forename: Richard
authors.initials: R
authors.lastname: Appleyard
authors.forename: Hala
authors.initials: H
authors.lastname: Zreiqat
mesh_terms: D001826:Body Fluids / Q000737:chemistry; D001861:Bone Regeneration; D002130:Calcium Phosphates / Q000737:chemistry* / Q000378:metabolism; D002478:Cells, Cultured; D020099:Coated Materials, Biocompatible / Q000737:chemistry* / Q000378:metabolism; D019245:Compressive Strength; D017886:Durapatite / Q000737:chemistry* / Q000378:metabolism; D006801:Humans; D008422:Materials Testing; D053758:Nanoparticles / Q000737:chemistry*; D010006:Osteoblasts / Q000166:cytology / Q000378:metabolism; D010316:Particle Size; D011091:Polyesters / Q000737:chemistry* / Q000378:metabolism; D016062:Porosity; D013499:Surface Properties; D023822:Tissue Engineering / Q000379:methods; D054457:Tissue Scaffolds / Q000737:chemistry*
chemical_list: D002130:Calcium Phosphates; D020099:Coated Materials, Biocompatible; D011091:Polyesters; C016240:polycaprolactone; D017886:Durapatite; C020243:calcium phosphate