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Home  >  Journal list  >  MATERIALS TRANSACTIONS  >  Vol.52  No.8 (2011)  >  pp.1650-1654

MATERIALS TRANSACTIONS
<<Previous article Vol.52  No.8 (2011)   pp.1650 - 1654 Next article>>

Osteoconductivity of Anodized Titanium with Controlled Micron-Level Surface Roughness

Dai Yamamoto1), Ikki Kawai1), Kensuke Kuroda1), Ryoichi Ichino2), Masazumi Okido1) and Azusa Seki3)
1) Department of Materials Science & Engineering, Graduate School of Engineering, Nagoya University
2) EcoTopia Science Institute, Nagoya University
3) Hamri Co., Ltd.


The aim of this study was to elucidate the relationship between the surface roughness and osteoconductivity of anodized titanium surfaces. Before anodizing, titanium substrates with different surface roughness were prepared by wet-polishing. These substrates were anodized at various voltages in H3PO4, H2SO4, and NaOH aqueous solutions, and their surface roughness was controlled simultaneously at the micron level. Surface roughness of these coatings was expressed with the arithmetical means (Ra). The osteoconductivity of anodized samples was evaluated by in vivo tests. In in vivo tests, samples were implanted in rats’ tibia for 14 d. Anatase type TiO2 films were formed on all of the anodized samples for in vivo tests. It was newly found that TiO2 film with small Ra value exhibited high osteoconductivity than that with high Ra value, especially when Ra value was <0.3 μm. In addition, the osteoconductivity of anodized samples with Ra/μm >0.3 was not improved by anodizing, showing the same low osteoconductivity of as-polished samples. These tendencies were observed for all of the TiO2 films regardless of the type of electrolytes.


Keyword:
anodizing, osteoconductivity, surface roughness, titanium, titanium dioxide

Received: February 04, 2011
Accepted: May 30, 2011 , Published online: July 25, 2011
Copyright (c) 2011 The Japan Institute of Metals

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