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Various techniques for forming TiO 2  coatings on Ti have been investigated for the improvement of the osteoconductivity of Ti implants. However, it is not clear how the oxidizing process affects this osteoconductivity. In this study, TiO 2  coatings were prepared using the following three processes: anodizing in 0.1 M H 3 PO 4  or 0.1 M NaOH aqueous solution; thermal oxidation at 673 K for 2 h in air; and a two-step process of anodizing followed by thermal oxidation. The oxide coatings were evaluated using SEM, XRD, and XPS. The water contact angle on the TiO 2  coatings was measured as a surface property. The osteoconductivity of these samples was evaluated by measuring the contact ratio of formed hard tissue on the implanted samples (defined as the  R   B-I  value) after 14 d implantation in rats' tibias. Anatase was formed by anodizing and rutile by thermal oxidation, but the difference in the TiO 2  crystal structure did not influence the osteoconductivity. Anodized TiO 2  coatings were hydrophilic, but thermally oxidized TiO 2  coatings were less hydrophilic than anodized TiO 2  coatings because they lacked in surface OH groups. The TiO 2  coating process using anodizing without thermal oxidation gave effective improvement of the osteoconductivity of Ti samples.

Osteoconductivity and Hydrophilicity of TiO2Coatings on Ti Substrates Prepared by Different Oxidizing Processes

Osteoconductivity and Hydrophilicity of TiO₂Coatings on Ti Substrates Prepared by Different Oxidizing Processes