Gap Effect on the Heterogeneous Nucleation of Apatite on Thermally Oxidized Titanium Substrate

Atsushi Sugino; Keita Uetsuki; Kanji Tsuru; Satoshi Hayakawa; Chikara Ohtsuki; Akiyoshi Osaka

doi:10.4028/www.scientific.net/KEM.361-363.621

Paper Titles

DNA-Coatings: Bioactive Properties and Effects on Osteoblast-Like Cells
p.605

Surface Modification of Titanium by Hydrothermal Treatment
p.609

Histomorphometric Evaluation of Bone Response to Different Titanium Implant Surfaces
p.613

Novel Method of Hydroxyapatite Coating on Titanium Using Chemical Deposition
p.617

Gap Effect on the Heterogeneous Nucleation of Apatite on Thermally Oxidized Titanium Substrate
p.621

In Vitro Evaluation of Combined Laser Processing on Ti6AI4V Discs: Macrostructuring and Pulsed Laser Deposition
p.625

Electrochemical Deposition of Apatite on Titanium Substrates by Using Pulse Current
p.629

Changes in the Activity of Osteoblast Like Cells with Sol-Gel Derived Hydroxyapatite and Zirconia Nanocoatings
p.633

Chemically Pre-Treated and Biomimetically Coated Titanium for Medical Applications: The True Structure Revealed by Transmission Electron Microscopy
p.637

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Gap Effect on the Heterogeneous Nucleation of Apatite on Thermally Oxidized Titanium Substrate

Abstract:

Apatite formation on the surface of materials in body environment is an essential condition to show osteoconduction after implantation in bony defects. This study reports the novel technique for providing the apatite-forming ability to titanium metals by only controlling the spatial gap and thermal oxidation. Two pieces of titanium thermally oxidized at 400 °C were set together like V-letter with varied mouth opening. They showed the formation of apatite on both facing surface after exposure to a simulated body fluid (SBF) proposed by Kokubo and his colleagues, when the gap was less than approximately 600 μm. Moreover, specimens with micro-grooves of 500 μm in depth and 200-1000 μm in width was able to form apatite in SBF with in 7 days, after they were thermally oxidized at 400 oC. These results indicated that the titanium metals were provided with apatite-forming ability, i.e. osteoconduction, due to controlled gap with thermally oxidized surface. Hence, we conclude that bioactive titanium substrate showing osteoconduction can be produced by designed machining followed by thermal oxidation at an appropriate temperature.