Histology of gingiva hard
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Questions and Answers

What type of cells form the basal cell layer of the oral epithelium?

  • Cube-shaped cells (correct)
  • Cylindrical cells
  • Flat squamous cells
  • Columnar cells
  • Which layer of the oral epithelium is characterized by large intercellular spaces?

  • Keratininized cell layer
  • Granular cell layer
  • Prickle cell layer (correct)
  • Basal cell layer
  • What is the primary type of epithelial tissue that makes up the oral epithelium?

  • Simple cuboidal epithelium
  • Stratified cuboidal epithelium
  • Simple squamous epithelium
  • Stratified squamous epithelium (correct)
  • In which layer of the oral epithelium does increased intracellular keratinization occur?

    <p>Keratininized cell layer</p> Signup and view all the answers

    What is the significance of desmosomes in the basal and prickle cell layers?

    <p>They provide structural stability</p> Signup and view all the answers

    Which gingival component is exclusively visible to the unaided eye?

    <p>Oral epithelium</p> Signup and view all the answers

    What is the primary function of the junctional epithelium in relation to teeth?

    <p>To seal the opening created by tooth eruption</p> Signup and view all the answers

    Which layer is NOT part of the cellular layers mentioned in the context of junctional epithelium?

    <p>Melanocyte layer</p> Signup and view all the answers

    What does the term 'junction' signify in the context of junctional epithelium?

    <p>The connection of epithelium trying to seal tooth eruptions</p> Signup and view all the answers

    During which developmental stage does the junctional epithelium arise?

    <p>During tooth eruption</p> Signup and view all the answers

    What characteristic of junctional epithelium enhances its functionality?

    <p>Its cellular layers configuration</p> Signup and view all the answers

    Which of these statements about the junctional epithelium is incorrect?

    <p>It maintains a constant openness to the oral cavity.</p> Signup and view all the answers

    Which epithelial structure forms the outermost layer of the gingiva?

    <p>Oral epithelium</p> Signup and view all the answers

    What is the primary function of gingival connective tissue?

    <p>Providing structural support for the gingival epithelium</p> Signup and view all the answers

    Which condition is considered a precursor to periodontitis?

    <p>Gingivitis</p> Signup and view all the answers

    Which of the following structures is not part of the gingival anatomy?

    <p>Dental pulp</p> Signup and view all the answers

    The junctional epithelium serves what primary function in relation to the tooth?

    <p>Anchors the gingiva to the tooth surface</p> Signup and view all the answers

    What role does the periodontal ligament play in supporting the teeth?

    <p>It provides cushioning for the tooth during bite forces.</p> Signup and view all the answers

    Which of the following is true about the sulcular epithelium?

    <p>It forms the outer margin of the gingival sulcus.</p> Signup and view all the answers

    Which structure directly attaches to the root of the tooth?

    <p>Junctional epithelium</p> Signup and view all the answers

    What is a characteristic of the sulcular epithelium?

    <p>It is nonkeratinized and releases gingival crevicular fluid.</p> Signup and view all the answers

    How does the junctional epithelium differ from the sulcular epithelium?

    <p>It connects the gingiva directly to the tooth surface.</p> Signup and view all the answers

    What is an implication of the high cell turnover in the junctional epithelium?

    <p>It maintains a thin epithelium at the apical zone.</p> Signup and view all the answers

    What does the term 'nonkeratinized' imply about the junctional epithelium?

    <p>It has lower resistance to mechanical stress.</p> Signup and view all the answers

    What is the significance of the gingival crevicular fluid (GCF)?

    <p>It flows from connective tissue into the sulcus.</p> Signup and view all the answers

    What is the typical thickness of cells in the junctional epithelium at the coronal aspect?

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

    Which statement is correct regarding the interface between the sulcular epithelium and the connective tissue?

    <p>It is characterized by a smooth interface.</p> Signup and view all the answers

    Why is the sulcular epithelium described as semi-permeable?

    <p>It allows selective passage of substances.</p> Signup and view all the answers

    What consequence does the structure of nonkeratinized epithelium have on its functionality?

    <p>It reduces its ability to provide a barrier against pathogens.</p> Signup and view all the answers

    Where is the junctional epithelium located relative to the sulcular epithelium?

    <p>It lies adjacent to the sulcular epithelium.</p> Signup and view all the answers

    Study Notes

    Oral Epithelium

    • Covers the outer surface of free and attached gingiva from the gingival margin to the mucogingival junction.
    • Only part of the periodontium visible without magnification.
    • High cell turnover rate.
    • Stratified squamous epithelium with four layers:
      • Basal cell layer: Cube-shaped cells.
      • Prickle cell layer: Spine-like cells with large intercellular spaces and desmosomes.
      • Granular cell layer: Flattened cells with increased intracellular keratin.
      • Keratinized cell layer (stratum corneum): Flattened cells with extensive intracellular keratin.

    Sulcular Epithelium

    • Faces the tooth surface without contacting it.
    • Thin, non-keratinized epithelium.
    • Lacks rete pegs (no wavy junction with connective tissue in health).
    • Semi-permeable, allowing gingival crevicular fluid (GCF) flow from connective tissue into the sulcus.
    • Harbors bacteria.

    Junctional Epithelium

    • Stratified squamous, non-keratinized epithelium.
    • Joins gingiva to tooth surface (0.71-1.35 mm in length).
    • Thicker coronally (15-30 cells) and thinner apically (4-5 cells).
    • High cell turnover.
    • More permeable than keratinized tissue.
    • Attachment to the tooth surface is via hemidesmosomes and the internal basal lamina.
    • Number of hemidesmosomes varies: 8-10 per micron coronally, 2 per micron apically.
    • Forms during tooth eruption to seal the opening created when the tooth penetrates the epithelial sheet.

    Gingival Connective Tissue

    • Attaches to the periodontal ligament.
    • Acts as a shock absorber.
    • Holds teeth in their sockets.
    • Joins with the overlying epithelium in a wavy pattern.

    Periodontium

    • Supports the teeth.
    • Includes the gingiva, periodontal ligament, cementum, and alveolar bone.
    • Gingivitis is reversible inflammation of the gingiva.
    • Periodontitis is irreversible inflammation affecting the supporting structures of the teeth. Gingivitis often precedes periodontitis.

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    Description

    This quiz covers the oral epithelium types, including the characteristics and functions of the keratinized and non-keratinized epithelium in the context of periodontology. Test your knowledge on the structure and significance of the sulcular and junctional epithelium as well.

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