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Hydroxyapatite as a filler for dental composite materials: mechanical properties and in vitro bioactivity of composites

  • C. Santos
  • Z. B. Luklinska
  • R. L. Clarke
  • K. W. M. Davy
Article

Abstract

Hydroxyapatite (HAp) powder was treated with γ-methacryloxypropyltrimethoxy-silane (γ-MPS) using standard techniques in both non-polar and polar systems. Infrared spectra (DRIFT) and thermogravimetric analysis (TGA) confirmed the presence of γ-MPS on the surface of the HAp filler particles. Series of experimental composites consisting of bisphenol-a-glycidyl methacrylate (BisGMA) based resin and untreated or treated HAp filler were produced to determine the mechanical properties and in vitro bioactivity. The incorporation of HAp filler into the BisGMA base resin had an enhancing effect on the flexural strength and Young's modulus of the base resin, the latter being increased by a factor of three. The mechanical properties of the filled resin were not affected by the surface treatment of the HAp, but filler loading was found to have a significant effect on Young's modulus. Higher proportions of silane-treated HAp of smaller particle size could be incorporated in the monomer phase giving rise to composites of higher stiffness. Examination of the fracture surfaces showed that the silanized HAp particles maintained better contact with the polymer matrix. In vitro study revealed that the composites incorporating silanized HAp formed a compact and continuous calcium phosphate layer on their surface after 4 weeks immersion in a simulated body fluid (SBF). © 2001 Kluwer Academic Publishers

Keywords

Hydroxyapatite Flexural Strength Calcium Phosphate Simulated Body Fluid Filler Particle 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Kluwer Academic Publishers 2001

Authors and Affiliations

  • C. Santos
    • 1
  • Z. B. Luklinska
    • 2
  • R. L. Clarke
    • 3
  • K. W. M. Davy
    • 3
  1. 1.St. Bartholomew's and the Royal London School of Medicine and Dentistry, Department of Biomaterials in Relation to Dentistry, Queen Mary and Westfield CollegeUniversity of LondonLondonUK
  2. 2.Materials Department/IRC in Biomedical Materials, Queen Mary and Westfield CollegeUniversity of LondonLondonUK
  3. 3.IRC in Biomedical Materials, St. Bartholomew's and the Royal London School of Medicine and Dentistry. Department of Biomaterials in Relation to Dentistry, Queen Mary and Westfield CollegeUniversity of LondonLondonUK

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