Role of acid attack in the in vitro bioactivity of a glass-ceramic of the 3CaO.P2O5-CaO.SiO2-CaO.MgO.2SiO2 system

Biomaterials. 2001 Jul;22(14):2013-9. doi: 10.1016/s0142-9612(00)00387-2.

Abstract

A non-bioactive glass-ceramic (GC13) that contains hydroxyapatite (Ca5(PO4)3OH), diopside (CaMg(SiO3)2) and althausite (Mg2 PO4OH) as crystalline phases has been obtained by thermal treatment of a parent bioactive glass (G13) of nominal composition (wt%) 40.0 CaO-34.5 SiO2-16.5 P2O5-8.5 MgO-0.5CaF2. To induce bioactivity, GC13 was chemically treated with 1 M HCl for different periods of time. After chemical etching the in vitro studies showed formation of an apatite-like surface layer. In this article the influence of etching time both on the surface composition of the glass-ceramic and on the growth rate of the apatite layer is studied. It is concluded that the presence of hydroxyapatite in the glass-ceramic, associated to microstructural fluctuations, can favour apatite deposition in vitro.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Apatites / analysis*
  • Biocompatible Materials / chemistry*
  • Biocompatible Materials / pharmacology
  • Calcium / analysis
  • Ceramics / chemistry*
  • Ceramics / pharmacology
  • Crystallization
  • Durapatite / chemistry*
  • Durapatite / pharmacology
  • Hydrochloric Acid / pharmacology*
  • Magnesium / analysis
  • Materials Testing
  • Microscopy, Electron, Scanning
  • Phosphorus / analysis
  • Silicon / analysis
  • Spectroscopy, Fourier Transform Infrared
  • X-Ray Diffraction

Substances

  • Apatites
  • Biocompatible Materials
  • GC13 ceramic
  • Phosphorus
  • Glass ceramics
  • Durapatite
  • Magnesium
  • Hydrochloric Acid
  • Calcium
  • Silicon