MECHANICAL PROPERTIES OF GLASS REINFORCED HYDROXYAPATITE

Authors

  • Y R Muslim Faculty of Dentistry, University of Malaya
  • Jonathan Knowles UCL Eastman Dental Institute
  • J Howlett Department of Prosthetics, Eastman Dental Institute, University College London

Keywords:

hydroxyapatite, glass reinforced hydroxylate

Abstract

Hydroxyapatite (HA) has been increasingly used in biomedical applications due to its biocompatibility with living tissues. However, its use is limited to low load bearing areas due to the poor mechanical properties compared to bone. The aim of this project is to improve the mechanical properties of synthetic HA by optimising the processing method and also by using a phosphate based glass as a sintering aid to develop Glass Reinforced Hydroxyapatite (GR-HA). A phosphate based glass containing CaO, P2O5 and CaF2 was incorporated into HA at 2.5wt% and 5wt% additions during the milling process prior to sintering at 1300°C. The flexural strength mean values for GR-HA ranged from 80MPa to 110MPa. Pure HA exhibited a much lower flexural strength mean value ranging from 66MPa to 79MPa. The improved mechanical properties were associated with the occurrence of residual stress as a result of decomposition of HA to b-Tricalcium Phosphate (TCP) and in 5wt% GRHA to a-Tricalcium Phosphate (TCP).

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Published

2018-06-30

Issue

Vol. 12 No. 1 (2005)

Section

Original/Research Article

License

  1. The Faculty of Dentistry, Universiti Malaya holds the copyright of the published manuscript including all its components such as supplementary information, graphical contents and raw data without any restrictions.
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