Calcium-Phosphate Formation on Titanium Modified with Newly Developed Calcium-Hydroxide-Slurry Treatment

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  • Ohtsu Naofumi
    Institute for Materials Research, Tohoku University Institute of Biomaterials and Bioengineering, Tokyo Medical and Dental University
  • Ashino Tetsuya
    Institute for Materials Research, Tohoku University
  • Ishihara Masahito
    Institute for Materials Research, Tohoku University
  • Sakamoto Fuyuki
    Institute for Materials Research, Tohoku University
  • Hanawa Takao
    Institute of Biomaterials and Bioengineering, Tokyo Medical and Dental University

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Abstract

Authors developed a new surface-modification method with calcium-hydroxide slurry, which make it possible to treat a titanium surface by contacting with an alkaline agent containing high concentration of calcium. The objective of the new surface modification method was to improve a bone conductivity of titanium with simple and low-cost processes. The calcium-hydroxide slurry was prepared by mixture of calcium-hydroxide regent and deionized water. A titanium plate was completely buried in the calcium-hydroxide slurry, and the slurry including the titanium was heated in air at 873 K for 7.2 ks, followed by washing in deionized water, and drying in air. Characterization with X-ray photoelectron spectroscopy revealed that chemical state of the surface-modified-titanium surface was the same as that of calcium titanate. X-ray diffraction pattern showed that the perovskite-type calcium titanate was formed in the surface-modified layer, and depth profile by Auger electron spectroscopy titanium indicated that dioxide layer was formed under the calcium-titanate layer. When the surface-modified titanium was immersed in a Hanks’ balanced saline solution for 9 d, hydroxyapatite was formed on the surface-modified-titanium surface, while was not formed on the unmodified-titanium surface without surface modification. However, after 18-d immersion, hydroxyapatite was also formed on unmodified-titanium surface. X-ray diffraction pattern showed that thickness of the hydroxyapatite layer formed on the surface-modified-titanium surface was thicker than that on the unmodified-titanium surface. These results indicated that the calcium-hydroxide-slurry treatment improves the performance of calcium-phosphate formation of titanium. Therefore, the new treatment technique is one of the promising methods for improvement of bone conductivity of titanium.

Journal

  • MATERIALS TRANSACTIONS

    MATERIALS TRANSACTIONS 48 (2), 105-110, 2007

    The Japan Institute of Metals and Materials

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