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3D printed Ti6Al4V implant surface promotes bone maturation and retains a higher density of less aged osteocytes at the bone-implant interface.

Journal article
Authors Furqan A. Shah
Anders Snis
Aleksandar Matic
Peter Thomsen
Anders Palmquist
Published in Acta biomaterialia
Volume 30
Pages 357–367
ISSN 1878-7568
Publication year 2016
Published at Institute of Clinical Sciences, Department of Biomaterials
Pages 357–367
Language en
Links dx.doi.org/10.1016/j.actbio.2015.11...
Keywords 3D printing, Ti6Al4V, Raman spectroscopy, Osteocyte, Electron microscopy, Osseointegration
Subject categories Biomaterials

Abstract

For load-bearing orthopaedic applications, metal implants having an interconnected pore structure exhibit the potential to facilitate bone ingrowth and the possibility for reducing the stiffness mismatch between the implant and bone, thus eliminating stress-shielding effects. 3D printed solid and macro-porous Ti6Al4V implants were evaluated after six-months healing in adult sheep femora. The ultrastructural composition of the bone-implant interface was investigated using Raman spectroscopy and electron microscopy, in a correlative manner. The mineral crystallinity and the mineral-to-matrix ratios of the interfacial tissue and the native bone were found to be similar. However, lower Ca/P ratios, lower carbonate content, but higher proline, phenylalanine and tyrosine levels indicated that the interfacial tissue remained less mature. Bone healing was more advanced at the porous implant surface (vs. the solid implant surface) based on the interfacial tissue ν1 CO3(2-)/ν2 PO4(3-) ratio, phenylalanine and tyrosine levels approaching those of the native bone. The mechanosensing infrastructure in bone, the osteocyte lacuno-canalicular network, retained ∼40% more canaliculi per osteocyte lacuna, i.e., a 'less aged' morphology at the interface. The osteocyte density per mineralised surface area was ∼36-71% higher at the interface after extended healing periods.

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