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Porous titanium with porosity gradients for biomedical applications

Version 2 2024-06-03, 10:55
Version 1 2014-10-27, 16:43
journal contribution
posted on 2024-06-03, 10:55 authored by C Wen, Y Yamada, A Nouri, Peter HodgsonPeter Hodgson
Highly porous titanium and titanium alloys with an open cell structure are promising implant materials due to their low elastic modulus, excellent bioactivity, biocompatibility and the ability for bone regeneration. However, the mechanical strength of the porous titanium decreases dramatically with increasing porosity, which is a prerequisite for the ingrowth of new bone tissues and vascularization. In the present study, porous titanium with porosity gradients, i.e. solid core with highly porous outer shell was successfully fabricated using a powder metallurgy approach. Satisfactory mechanical properties derived from the solid core and osseointegration capacity derived from the outer shell can be achieved simultaneously through the design of the porosity gradients of the porous titanium. The outer shell of porous titanium exhibited a porous architecture very close to
that of natural bone, i.e. a porosity of 70% and pore size distribution in the range of 200 - 500 μm. The peak stress and the elastic modulus of the porous titanium with a porosity gradient (an overall porosity 63%) under compression were approximately 152 MPa and 4 GPa, respectively. These
properties are very close to those of natural bone. For comparison, porous titanium with a uniform porosity of 63% was also prepared and haracterised in the present study. The peak stress and the elastic modulus were 109 MPa and 4 GPa, respectively. The topography of the porous titanium
affected the mechanical properties significantly.

History

Journal

Materials science forum

Volume

539-543

Pagination

720-725

Location

Aedermannsdorf, Switzerland

ISSN

0255-5476

Language

eng

Publication classification

C1 Refereed article in a scholarly journal

Copyright notice

2007, Trans Tech Publications

Publisher

Trans Tech Publications