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Matrix and mineral changes in developing enamel.

C Robinson, H D Briggs, P J Atkinson

    Journal of Dental Research
    |March 1, 1979
    PubMed
    Summary
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    Enamel development involves matrix changes and selective amelogenin loss before mineralization. Mineral ions increase as organic matrix is lost and replaced by water in developing rat and bovine incisors.

    Area of Science:

    • Biochemistry
    • Developmental Biology
    • Mineralization

    Background:

    • Enamel formation is a complex biomineralization process.
    • The enamel matrix undergoes significant changes during development.
    • Understanding these changes is crucial for dental health.

    Purpose of the Study:

    • To investigate changes in enamel and the enamel organ during development.
    • To analyze the molecular and ionic composition shifts during enamel matrix formation and degradation.
    • To correlate matrix changes with mineral deposition in developing incisors.

    Main Methods:

    • Analysis of small tissue samples from developing rat and bovine incisors.
    • Examination of enamel matrix components and mineral ion concentrations.

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  • Assessment of molecular weight changes and ion ratios (Ca/P, F, Mg, CO3, 32PO4).
  • Main Results:

    • Selective loss of amelogenin components occurred before secondary mineralization.
    • A slight increase in smaller molecular weight components suggested limited matrix breakdown.
    • Mineral ion concentration increased steeply after organic matrix removal.
    • Minor inorganic ion concentrations (F, Mg, CO3) decreased during development.
    • Ions like fluoride and phosphate penetrated and concentrated in enamel as water replaced lost matrix.

    Conclusions:

    • Enamel development is characterized by selective matrix component loss and subsequent mineralization.
    • The replacement of organic matrix with water facilitates ion uptake prior to rapid mineralization.
    • These findings provide insights into the intricate process of tooth enamel formation.