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Related Experiment Videos

Epithelial root-sheath changes during molar formation in the mouse.

F G Gurling, W J Sampson

    Archives of Oral Biology
    |January 1, 1985
    PubMed
    Summary
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    The epithelial root sheath in mouse molars changes structure as roots mature. Inner cells persist, forming epithelial rests adjacent to developing cementum during root development.

    Area of Science:

    • Developmental Biology
    • Oral Biology
    • Histology

    Background:

    • The epithelial root sheath is crucial for tooth root development and cementum formation.
    • Understanding its dynamic changes provides insights into odontogenesis and potential pathologies.

    Purpose of the Study:

    • To investigate the ultrastructural changes in the epithelial root sheath during mouse molar root maturation.
    • To correlate these morphological changes with root development stages and the formation of epithelial rests.

    Main Methods:

    • Transmission electron microscopy was used to examine the ultrastructure of the epithelial root sheath.
    • Samples were obtained from the first mandibular molar teeth of mice at 11, 16, and 21 days of age.

    Main Results:

    Related Experiment Videos

    • The epithelial root sheath exhibited progressive shortening in an apical direction with root maturation.
    • The outer layer of the sheath diminished more rapidly than the inner layer.
    • Persistent inner epithelial root sheath cells were observed adjacent to forming acellular cementum, forming epithelial rests.

    Conclusions:

    • The epithelial root sheath undergoes significant morphological changes during root development, with the inner layer playing a key role in forming epithelial rests.
    • These findings clarify the origin and timing of epithelial rests in relation to root maturation and cementogenesis.