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Osteoblast response and osseointegration of a Ti-6Al-4V alloy implant incorporating strontium.

Abstract：

:This study investigated the surface characteristics, in vitro and in vivo biocompatibility of Ti-6Al-4V alloy implants incorporating strontium ions (Sr), produced by hydrothermal treatment using a Sr-containing solution, for future biomedical applications. The surface characteristics were evaluated by scanning electron microscopy, thin-film X-ray diffractometry, X-ray photoelectron spectroscopy, optical profilometry, contact angle and surface energy measurement and inductively coupled plasma-mass spectroscopy (ICP-MS). Human osteoblast-like cell (MG63) attachment, proliferation, alkaline phosphatase (ALP) activity, and quantitative analysis of osteoblastic gene expression on Sr-containing Ti-6Al-4V surfaces were compared with untreated Ti-6Al-4V surfaces. Fifty-six screw implants (28 control and 28 experimental) were placed in the tibiae and femoral condyles of seven New Zealand White rabbits. The osteoconductivity of Sr-containing Ti-6Al-4V implants was evaluated by removal torque testing and histomorphometric analysis after 4weeks implantation. Hydrothermal treatment produced a crystalline SrTiO(3) layer. ICP-MS analysis showed that Sr ions were released from treated surfaces into the solution. Significant increases in ALP activity (P=0.000), mRNA expressions of key osteoblast genes (osterix, bone sialoprotein, and osteocalcin), removal torque values (P<0.05) and bone-implant contact percentages (P<0.05) in both cortical and cancellous bone were observed for Sr-containing Ti-6Al-4V surfaces. The results indicate that the Sr-containing oxide layer produced by hydrothermal treatment may be effective in improving the osseointegration of Ti-6Al-4V alloy implants by enhancing differentiation of osteoblastic cells, removal torque forces and bone apposition in both cortical and cancellous bone.

journal_name

Acta Biomater

journal_title

Acta biomaterialia

authors

Park JW,Kim HK,Kim YJ,Jang JH,Song H,Hanawa T

doi

10.1016/j.actbio.2010.01.017

subject

Has Abstract

pub_date

2010-07-01 00:00:00

pages

2843-51

issue

7

eissn

1742-7061

issn

1878-7568

pii

S1742-7061(10)00028-0

journal_volume

6

pub_type

杂志文章

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