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Questions and Answers
What is the primary function of the oral epithelium in relation to the gingiva?
What is the primary function of the oral epithelium in relation to the gingiva?
Which layer of the oral epithelium is closest to the surface?
Which layer of the oral epithelium is closest to the surface?
What type of cells primarily make up the basal cell layer of the oral epithelium?
What type of cells primarily make up the basal cell layer of the oral epithelium?
What characteristic do the cells in the prickle cell layer of the oral epithelium have?
What characteristic do the cells in the prickle cell layer of the oral epithelium have?
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How does the keratinized cell layer differ from the granular cell layer?
How does the keratinized cell layer differ from the granular cell layer?
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What role do desmosomes play in the layers of oral epithelium?
What role do desmosomes play in the layers of oral epithelium?
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What connects epithelial cells to the basal lamina?
What connects epithelial cells to the basal lamina?
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Which cell junction connects neighbouring epithelial cells and their cytoskeletons?
Which cell junction connects neighbouring epithelial cells and their cytoskeletons?
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What role does the gingival connective tissue play?
What role does the gingival connective tissue play?
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What is the primary function of junctional epithelium?
What is the primary function of junctional epithelium?
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Which structure is involved in attaching the gingiva to the alveolar bone?
Which structure is involved in attaching the gingiva to the alveolar bone?
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What does the term 'hemidesmosomes' refer to?
What does the term 'hemidesmosomes' refer to?
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What type of epithelium is the sulcular epithelium classified as?
What type of epithelium is the sulcular epithelium classified as?
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What is a function of the gingival crevicular fluid (GCF)?
What is a function of the gingival crevicular fluid (GCF)?
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Which characteristic does the junctional epithelium have in comparison to the sulcular epithelium?
Which characteristic does the junctional epithelium have in comparison to the sulcular epithelium?
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How does the sulcular epithelium interface with the underlying connective tissue?
How does the sulcular epithelium interface with the underlying connective tissue?
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What is the approximate length range of the junctional epithelium?
What is the approximate length range of the junctional epithelium?
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What is the cell thickness of the sulcular epithelium at the coronal zone?
What is the cell thickness of the sulcular epithelium at the coronal zone?
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What distinguishes nonkeratinized epithelium from keratinized epithelium?
What distinguishes nonkeratinized epithelium from keratinized epithelium?
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What is a key characteristic of the junctional epithelium's cellular structure?
What is a key characteristic of the junctional epithelium's cellular structure?
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What is the primary role of the junctional epithelium in relation to teeth?
What is the primary role of the junctional epithelium in relation to teeth?
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Where does the junctional epithelium originate from?
Where does the junctional epithelium originate from?
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What does the term 'junction' signify in the context of the junctional epithelium?
What does the term 'junction' signify in the context of the junctional epithelium?
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Which cell layer does NOT contribute directly to the formation of junctional epithelium?
Which cell layer does NOT contribute directly to the formation of junctional epithelium?
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What characteristic of the junctional epithelium is important for its function?
What characteristic of the junctional epithelium is important for its function?
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Which process involves the attachment of epithelium to seal the tooth opening?
Which process involves the attachment of epithelium to seal the tooth opening?
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During tooth eruption, what happens to the continuous epithelial sheet?
During tooth eruption, what happens to the continuous epithelial sheet?
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What does the term 'embryology' in this context refer to?
What does the term 'embryology' in this context refer to?
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Which layer is most responsible for the regenerative capability of the junctional epithelium?
Which layer is most responsible for the regenerative capability of the junctional epithelium?
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What function does the junctional epithelium NOT serve?
What function does the junctional epithelium NOT serve?
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Study Notes
Oral Epithelium
- Covers the outer surface of the free and attached gingiva, extending from the gingival margin to the mucogingival junction.
- Only part of the periodontium visible without magnification.
- High cell turnover rate.
- Stratified squamous epithelium with several layers:
- Basal cell layer: Cube-shaped cells.
- Prickle cell layer: Spine-like cells with large intercellular spaces, connected by desmosomes.
- Granular cell layer: Flattened cells with increased intracellular keratin.
- Keratinized cell layer (stratum corneum): Flattened cells with extensive intracellular keratin.
Sulcular Epithelium
- Lines the gingival sulcus, facing the tooth but not in contact with it.
- Thin, non-keratinized epithelium without rete pegs.
- Semi-permeable, allowing gingival crevicular fluid (GCF) flow from connective tissue into the sulcus.
- Harbors bacteria.
Junctional Epithelium
- Stratified squamous, non-keratinized epithelium.
- Connects the gingiva to the tooth surface.
- Length: 0.71–1.35 mm.
- Cell thickness varies: 15–30 cells coronally, 4–5 cells apically.
- High cell turnover.
- More permeable than keratinized tissue due to lack of keratinization.
- Forms due to the body sealing the opening created when teeth erupt through the epithelial sheet. It's an embryological process of connection.
- Attachment to connective tissue via hemidesmosomes and the external basal lamina.
Cell Junctions
- Desmosomes: Connect neighboring epithelial cells and their cytoskeletons.
- Hemidesmosomes: Connect epithelial cells to the basal lamina.
Functions of Junctional Epithelium
- Attachment of gingiva to tooth.
- Barrier function.
- Host defense.
- GCF leakage.
Gingival Connective Tissue (Lamina Propria)
- Provides solidity to the gingiva.
- Attaches gingiva to cementum and alveolar bone.
- Transports water, nutrients, metabolites, and oxygen to connective tissue cells.
- Mediates host immune response.
Connective Tissue Fibers
-
Supragingival Fibers: Maintain gingival integrity and withstand forces. Their disintegration contributes to inflammation.
- Alveologingival
- Circular
- Dentogingival
- Periosteogingival
- Intergingival
- Intercircular
- Interpapillary
- Transgingival
- Transeptal
Gingival Sulcus in Health
- Depth: Not specified in provided text.
- Shape: Not specified in provided text.
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Description
This quiz covers the detailed structure and functions of the oral epithelium, including the free and attached gingiva, sulcular epithelium, and junctional epithelium. Learn about the cell types, turnover rates, and unique characteristics of these epithelial layers crucial for oral health. Test your understanding of their roles in the periodontium.
