Kinetics of dissolution and growth of calcium fluoride and effects of phosphate

Authors

  • JØRgen Christoffersen Department of Medical Chemistry, Panum Institute, University of Copenhagen, Copenhagen, Denmark; Institute of Physics, Technical University of Lódź, Lódź, Poland; Laboratory for Materia Technica, State University of Groningen, Groningen, The Netherlands
  • Margaret R. Christoffersen Department of Medical Chemistry, Panum Institute, University of Copenhagen, Copenhagen, Denmark; Institute of Physics, Technical University of Lódź, Lódź, Poland; Laboratory for Materia Technica, State University of Groningen, Groningen, The Netherlands
  • Wiktor Kibalczyc Department of Medical Chemistry, Panum Institute, University of Copenhagen, Copenhagen, Denmark; Institute of Physics, Technical University of Lódź, Lódź, Poland; Laboratory for Materia Technica, State University of Groningen, Groningen, The Netherlands
  • W. G. Perdok Department of Medical Chemistry, Panum Institute, University of Copenhagen, Copenhagen, Denmark; Institute of Physics, Technical University of Lódź, Lódź, Poland; Laboratory for Materia Technica, State University of Groningen, Groningen, The Netherlands

DOI:

https://doi.org/10.3109/00016358809004784

Keywords:

Apatites, dental deposits, dental enamel, dental enamel solubility, fluoride, topical

Abstract

The rate of growth of pure calcium fluoride crystals is controlled by a surface polynuclear mechanism when the supersaturation is less than 4.4. The surface free energy is found to be 120 mJ/m2. The dissolution process is also controlled by a surface process. Both of these processes are very strongly inhibited by phosphate ions. Calcium fluoride-like materials contaminated with phosphate are formed when calcium fluoride is precipitated in phosphate-containing solutions or suspensions. The physical and chemical properties of these materials have been investigated and compared with the corresponding properties of pure calcium fluoride. The former dissolve much faster than pure calcium fluoride in solutions containing phosphate, but an inhibitory effect is still shown. It is suggested that the calcium fluoride-like material formed on dental enamel during treatment of enamel with acidified solutions of high fluoride content is a phosphate-containing calcium fluoride.

Downloads

Download data is not yet available.

Downloads

Published

1988-01-01

Issue

Vol. 46 No. 6 (1988): Acta Odontologica Scandinavica

Section

Articles

License

Copyright (c) 1988 Acta Odontologica Scandinavica

Creative Commons License

This work is licensed under a Creative Commons Attribution 4.0 International License.