Surface-layer Modification of Hydroxyapatite Ceramic with Acid and Heat Treatments.

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  • KON Masayuki
    Department of Dental Engineering, School of Dentistry, Tokushima University
  • HIRAKATA Luciana M.
    Department of Dental Engineering, School of Dentistry, Tokushima University
  • MIYAMOTO Youji
    First Department of Oral and Maxillofacial Surgery, School of Dentistry, Tokushima University
  • KAWANO Fumiaki
    Department of Removable Prosthodontics, School of Dentistry, Tokushima University
  • ASAOKA Kenzo
    Department of Dental Engineering, School of Dentistry, Tokushima University

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Abstract

The purpose of this study was to examine or characterize the surface layer of a calcium phosphate ceramic with a gradual compositional change from α-tricalcium phosphate (α-TCP) on the surface to hydroxyapatite (HAP) on the inside. The surface of a dense HAP ceramic was acid-treated for 1 hour with orthophosphoric acid (H3PO4) solutions of several concentrations (0.5, 1.0 and 5.0mol/L) or a buffered solution (pH 4.0) consisting of phosphate solutions. After acid treatment, specimens were heat-treated at 1, 250°C for 1 hour. X-ray photoelectron spectroscopy revealed that the compositional gradient layer could be modified on the surface of the HAP ceramic with all acid and heat treatments, and that 5.0mol/L H3PO4 solution and heat treatments had a maximal thickness of approximately 2μm for the surface-modified layer. It was confirmed that the outermost layer of HAP ceramics modified with the treatments, except 5.0mol/L H3PO4 solution, showed a compound such α-TCP.

Journal

  • Dental Materials Journal

    Dental Materials Journal 21 (2), 170-180, 2002

    The Japanese Society for Dental Materials and Devices

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