Histology of gingiva hard
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Questions and Answers

Which of the following describes the function of the oral epithelium?

  • Provides structural support to the gingiva
  • Acts as a barrier against pathogens (correct)
  • Serves as a shock absorber for the periodontal ligament
  • Facilitates the exchange of nutrients with blood vessels
  • Which structure is NOT part of the gingival anatomy?

  • Periodontal ligament
  • Oral epithelium
  • Dentin (correct)
  • Sulcular epithelium
  • What is the role of the junctional epithelium?

  • Supports periodontal bone density
  • Absorbs shock during mastication
  • Connects the gingiva to the teeth (correct)
  • Facilitates blood flow to the gingiva
  • What problem may arise from gingivitis if it is left untreated?

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

    Which of the following is a characteristic function of gingival connective tissue?

    <p>Acts as scaffolding for the gingiva</p> Signup and view all the answers

    Which structure sits above the periodontal ligament?

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

    What does the term 'non-keratinized' epithelium imply about its properties compared to keratinized tissue?

    <p>Higher permeability and absorbency</p> Signup and view all the answers

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

    <p>To provide a barrier against bacterial invasion</p> Signup and view all the answers

    How many cellular layers are described for the junctional epithelium?

    <p>4 to 5 cells thick</p> Signup and view all the answers

    What happens to the body’s epithelium when teeth erupt?

    <p>It forms a junction around the opening</p> Signup and view all the answers

    Which of the following best describes the process of forming junctional epithelium?

    <p>A natural process of sealing an opening</p> Signup and view all the answers

    What is the significance of high cell turnover in the junctional epithelium?

    <p>It allows for rapid repair and adaptation</p> Signup and view all the answers

    What does the term 'junction' in junctional epithelium refer to?

    <p>A natural sealing of the opening by epithelium</p> Signup and view all the answers

    Which of the following layers is NOT typically associated with the structure of junctional epithelium?

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

    What structure connects epithelial cells to the basal lamina?

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

    What is the primary function of the junctional epithelium?

    <p>Act as a barrier and host defense</p> Signup and view all the answers

    Which component of gingival connective tissue provides solidity and attachment?

    <p>Lamina propria</p> Signup and view all the answers

    How many cell layers are typically associated with hemidesmosomes in the junctional epithelium?

    <p>3-4 layers</p> Signup and view all the answers

    What is released from the gingival connective tissue to aid in defense?

    <p>Gingival crevicular fluid</p> Signup and view all the answers

    What is the primary component that attaches the gingiva to the tooth roots and alveolar bone?

    <p>Connective tissue</p> Signup and view all the answers

    What are closely packed epithelial cells in the junctional epithelium primarily connected by?

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

    What is the role of the internal basal lamina?

    <p>To separate epithelial cells from the tooth surface</p> Signup and view all the answers

    What type of cell junction is primarily involved in the attachment of junctional epithelium to the tooth surface?

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

    How many hemidesmosomes are typically present per micron at the coronal end of the junctional epithelium?

    <p>8-10</p> Signup and view all the answers

    What does the external basal lamina provide a separation between?

    <p>Epithelial cells and the gingival connective tissue</p> Signup and view all the answers

    What is the characteristic feature of junctional epithelium structure?

    <p>Closely packed epithelial cells</p> Signup and view all the answers

    Which statement about hemidesmosomes in the junctional epithelium is correct?

    <p>There are two hemidesmosomes at the apical end.</p> Signup and view all the answers

    What is the function of desmosomes in junctional epithelium?

    <p>To connect neighboring epithelial cells</p> Signup and view all the answers

    Why is the attachment of junctional epithelium to the tooth surface crucial?

    <p>It prevents bacterial invasion.</p> Signup and view all the answers

    What is a primary structural component of the junctional epithelium?

    <p>Epithelial cells</p> Signup and view all the answers

    Study Notes

    Oral Epithelium

    • Attaches to the tooth & periodontal ligament
    • Acts as a scaffolding, supporting structures of the gingiva
    • Functions as a shock absorber for the teeth - holds everything together
    • 4-5 cells thick at the apical zone
    • Non-keratinized: cells are more permeable, high absorbancy

    Sulcular Epithelium

    • Located in the gingival sulcus, space between the tooth and the gingiva
    • 4-5 cells thick, closely packed epithelial cells
    • Connected to neighboring cells by desmosomes (cell junctions)
    • Hemidesmosomes and internal basal lamina anchor it to the tooth surface
    • Hemidesmosomes and external basal lamina anchor it to the gingival connective tissue

    Junctional Epithelium

    • Attached to the tooth surface, it acts as a barrier to prevent bacteria from entering the body
    • Provides host defense by allowing the passage of white blood cells and antibodies from the gingival crevicular fluid
    • 4-5 cell layers thick, tightly joined
    • Attaches to the tooth by hemidesmosomes and internal basal lamina
    • Attaches to the connective tissue by hemdesmosomes and external basal lamina
    • Origin: It is formed from the continuous sheet of epithelium covering the body. The tooth penetrates this sheet during eruption, creating an opening that the body attempts to seal with epithelium.

    Cell Junctions

    • Desmosomes: Connects two neighboring epithelial cells and their cytoskeletons together
    • Hemidesmosomes: Connects the epithelial cells to the basal lamina

    Functions of Gingival Connective Tissue

    • Provides solidity to the free and attached gingiva
    • Attaches the gingiva to the cementum of the root and the alveolar bone
    • Transports water, nutrients, metabolites, oxygen, etc., to and from individual connective tissue cells within the matrix
    • Plays a role in the host response - immune response

    Supragingival Fibers of Connective Tissue

    • Made of elastic collagen fibers, they are a vital component of the gingival connective tissue
    • Functions:
      • Keeping the gingiva upright
      • Withstanding forces from different directions
      • Bracing
    • These fibers disintegrate during inflammation.

    Dentogingival Fibers (Connective Tissue)

    • Alveologingival: Alveolar crest to gingival connective tissue
    • Circular: Ring around coronally above crestal bone
    • Dentogingival: Cementum fan into gingival connective tissue
    • Periosteogingival: Fan from periosteum
    • Intergingival: Mesiodistal direction along the whole dental arch, linking teeth together
    • Intercircular: Encircle several teeth linking teeth together
    • Interpapillary: Located in the papilla connect oral & vestibular papilla
    • Transgingival: Cementum to CEJ and run horizontally linking teeth together
    • Transeptal: Cementum of one tooth to another tooth over crestal bone

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    Related Documents

    Histology of the Gingiva GN PDF

    Description

    Explore the intricate functions and structures of oral epithelium, sulcular epithelium, and junctional epithelium. This quiz delves into their roles in supporting gingival health and preventing bacterial entry. Assess your understanding of their cellular composition and anchoring mechanisms.

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