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Related Experiment Videos

Plaque mineralisation in vitro

L Wong1

  • 1Department of Pathology, Wellington School of Medicine.

The New Zealand Dental Journal
|May 19, 1998
PubMed
Summary
This summary is machine-generated.

Dental calculus forms when plaque minerals deposit calcium and phosphate. A new artificial mouth system shows urea in mineralizing solutions is key for plaque mineralization and viability.

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Area of Science:

  • Oral microbiology
  • Biomineralization
  • Dental research

Background:

  • Dental calculus, or hardened plaque, forms through mineral deposition from oral fluids.
  • Understanding plaque mineralization is crucial for dental health and disease prevention.
  • Existing methods for studying plaque mineralization have limitations.

Purpose of the Study:

  • To develop and evaluate an artificial-mouth microcosm system for studying dental plaque mineralization.
  • To investigate the role of urea and pH control in plaque mineralization.
  • To characterize the mineral composition and deposition patterns in mineralized plaque.

Main Methods:

  • Cultured dental plaque from saliva under simulated oral conditions using a mucin-containing medium.
  • Applied sucrose to mimic dietary intake and a urea-based mineralizing solution (calcium-phosphate-monofluorophosphate-urea or CPMU).

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  • Monitored pH oscillations and analyzed plaque mineral composition using electron microscopy.

    • Main Results:

    • The artificial-mouth system successfully generated pH oscillations in response to CPMU and sucrose applications.
    • Plaque mineralization was highly dependent on urea in the CPMU solution.
    • Mineralization increased with higher resting pH, influenced by urea in the medium.
    • Combined CPMU and sucrose application improved plaque viability and mineralization.
    • The primary mineral formed was carbonated hydroxyapatite, with some calcium carbonate detected.

    Conclusions:

    • The developed artificial-mouth system is effective for studying dental plaque mineralization.
    • Urea is a critical component for effective plaque mineralization in this system.
    • The system allows for the investigation of pH dynamics and mineral formation relevant to calculus development.
    • The findings provide insights into the biomineralization processes underlying dental calculus formation.