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Related Experiment Videos

Biological apatite crystal disolution.

J C Voegel, P Garnier

    Journal of Dental Research
    |March 1, 1979
    PubMed
    Summary
    This summary is machine-generated.

    Human enamel dissolution shows an initial rapid phase followed by slow calcium release. Increasing pH and fluoride ions reduce apatite dissolution, particularly impacting carbonate loss over time.

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    Area of Science:

    • Biomineralization
    • Dental Materials Science
    • Physical Chemistry

    Background:

    • Human enamel dissolution is a complex process influenced by chemical environment.
    • Understanding enamel demineralization is crucial for dental health and material science applications.
    • Acidic conditions lead to the dissolution of enamel's apatite structure.

    Purpose of the Study:

    • To characterize the dissolution curves of acid-treated human enamel powder.
    • To investigate the effect of pH and fluoride on enamel dissolution and ionic release.
    • To analyze the relative ionic variations, particularly carbonate and phosphate, using infrared spectroscopy.

    Main Methods:

    • Dissolution experiments on human acid-treated enamel powder.
    • Monitoring calcium release over time to establish dissolution curves.

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  • Infrared (IR) vibration band analysis to quantify ionic variations (phosphate, carbonate, HPO42-).
  • Investigating the impact of varying pH and fluoride concentrations.

    • Main Results:

    • Dissolution curves exhibit an initial rapid phase followed by a slower phase with minimal calcium release.
    • Increased pH and fluoride ions reduce apatite dissolution, especially over short intervals.
    • Infrared spectroscopy revealed preferential carbonate loss initially, followed by phosphate release.
    • Fluoride and higher pH shifted the preferential carbonate loss to longer times; high fluoride levels eliminated this preferential loss.
    • Absence of fluoride showed continuous HPO42- increase, while fluoride addition resulted in a smaller, linear increase.

    Conclusions:

    • Enamel dissolution is a multi-stage process with distinct ionic release patterns.
    • pH and fluoride significantly modulate the dissolution kinetics and ionic selectivity of enamel.
    • Infrared spectroscopy is effective in elucidating the complex ionic changes during enamel demineralization and remineralization processes.