Oral Mucus Membrane Dentogingival Junction
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Questions and Answers

What is the characteristic of the intercellular spaces in the junctional epithelium cells?

  • Large intercellular spaces (correct)
  • Abundant desmosomes
  • Tightly packed cells
  • No neutrophils present

    • What is the function of hemidesmosomes in the junctional epithelium cells?

  • To separate the epithelial cells
  • To produce basal lamina
  • To attach to the tooth (correct)
  • To form desmosomes

    • What is the term for the combination of hemidesmosomes and basal lamina?

  • Epithelial attachment
  • Attached apparatus (correct)
  • Hemidesmosome complex
  • Basal lamina complex

    • What is the unique feature of the junctional epithelium?

    <p>Having two basal laminae</p> Signup and view all the answers

    What is the term for the basal lamina in contact with the tooth?

    <p>Internal basal lamina</p> Signup and view all the answers

    What is the term for the shift of the Dento-Gingival Junction?

    <p>Gingival recession</p> Signup and view all the answers

    During what period does the first stage of gingival recession occur in permanent teeth?

    <p>From 20-30 years</p> Signup and view all the answers

    What is the duration of the second stage of gingival recession?

    <p>Up to 40 years</p> Signup and view all the answers

    What is the origin of the junctional epithelium?

    <p>Reduced enamel epithelium</p> Signup and view all the answers

    What is the characteristic of the interface between the epithelium and lamina propria?

    <p>Interface with smooth basement membrane</p> Signup and view all the answers

    What is the thickness of the junctional epithelium coronally?

    <p>15-30 cells thick</p> Signup and view all the answers

    What is the characteristic of the lamina propria in the dento-gingival junction?

    <p>It appears to be more cellular than other parts of the gingiva</p> Signup and view all the answers

    What is the rate of turnover of the junctional epithelium?

    <p>In the order of 5-6 days</p> Signup and view all the answers

    What is the characteristic of the gingival sulcus epithelium?

    <p>Nonkeratinized stratified squamous epithelium</p> Signup and view all the answers

    What is the thickness of the junctional epithelium apically?

    <p>1-3 cells thick</p> Signup and view all the answers

    What are the layers of cells in the junctional epithelium?

    <p>A single layer of cuboidal cells and several layers of flattened cells</p> Signup and view all the answers

    Study Notes

    Histological Structure of Junctional Epithelium

    • Junctional epithelial cells are connected by few desmosomes and have large intercellular spaces, allowing for the passage of crevicular fluid and defense cells.
    • Healthy gingival tissue may exhibit neutrophils in the intercellular spaces, indicative of its protective role.

    Histology of Dento-Gingival Junction

    • Basal cell layer consists of superficial flat cells, hemidesmosomes, and external basal lamina.
    • Lamina propria is separated from the epithelial cells by a smooth basement membrane.
    • Internal basal lamina is in contact with the tooth, and external basal lamina is in contact with the lamina propria.

    Attached Apparatus (Epithelial Attachment)

    • Junctional epithelial cells attach to the enamel or cementum by hemidesmosomes and a basal lamina produced by the epithelial cells.

    Gingival Recession (Passive Eruption)

    • Gingival recession occurs in two stages: first stage until the age of 1 year in primary teeth and until 20-30 years in permanent teeth, and second stage persisting up to 40 years.

    Oral Mucous Membrane: Dentogingival Junction

    • The junctional epithelium is unique in having two basal laminae.

    Histogenesis of Dento-Gingival Junction

    • Desmolytic enzymes break down the epithelial plug, forming the primary D.G.J.
    • Reduced dental epithelium forms the primary attachment epithelium, which later forms the secondary attachment epithelium.

    Gingival Sulcus and Dentogingival Junction

    • Gingival sulcus is lined by non-keratinized stratified squamous epithelium, which is thinner than epithelium of gingiva and lacks epithelial ridges.

    Histology of Dento-Gingival Junction

    • The junctional epithelium is 15-30 cells thick coronally and 1-3 cells thick apically.
    • It consists of two zones: a single cell layer of cuboidal cells (stratum germinativum) and several layers of flattened cells.
    • The junctional epithelium has a high rate of turnover (5-6 days).
    • It is initially derived from the rapidly replaced reduced enamel epithelium.

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