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What is the primary role of hemidesmosomes in the junctional epithelium?
Which structure is responsible for the attachment of the gingiva to the cementum of the root?
What type of cell junction connects two neighboring epithelial cells and their cytoskeletons?
What does the term 'junction' refer to in the context of epithelial attachment?
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How many hemidesmosomes are present per micron at the coronal end of the junctional epithelium?
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Which layer of extracellular matrix is situated between the epithelial cells and the tooth surface?
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Which function is NOT attributed to the junctional epithelium?
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What provides solidity to the gingiva and connects it to the underlying structures?
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Which area of the gingival epithelium is located at the dento-gingival junction?
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What is the primary function of the gingival connective tissue?
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Which type of epithelium is the oral epithelium classified as?
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Where does the oral epithelium extend to in the gingiva?
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Which cell layer is NOT present in the oral epithelium?
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What is the role of desmosomes in the oral epithelium?
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Which structure is NOT considered part of the gingiva?
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What characteristic feature defines the sulcular epithelium?
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What is the primary function of the dense network in gingival connective tissue?
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Which of the following fibroblast functions is NOT a role of gingival connective tissue?
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What is the primary orientation of the IG (Intergingival) fibres of the supragingival connective tissue?
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Which type of supragingival fibre connects the cementum of a tooth to the adjacent tooth over the crestal bone?
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In a healthy gingival sulcus, what is its typical depth?
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What shape is typically observed in a healthy gingival sulcus?
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Which type of supragingival fibre runs horizontally, linking teeth together from cementum to the CEJ?
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What characteristic is true about attached gingiva?
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What characterizes the sulcular epithelium?
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How thick is the junctional epithelium at its apical zone?
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What role does the junctional epithelium play?
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What is the primary function of gingival crevicular fluid (GCF)?
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What is true about the cellular composition of the junctional epithelium?
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What is the characteristic of the interface where the sulcular epithelium joins connective tissue?
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What does high cell turnover in the junctional epithelium indicate?
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Why is the glycoprotein-rich matrix important in the junctional epithelium?
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Study Notes
Gingival Connective Tissue Functions
- Provides integrity and strength to gingival tissues through a dense network.
- Transports water, nutrients, metabolites, and oxygen to and from connective tissue cells within its matrix.
- Plays a key role in the host immune response.
Supragingival Connective Tissue Fibers
- Alveologingival (AG): Extend from the alveolar crest to the gingival connective tissue.
- Circular (C): Encircle the tooth coronally above the crestal bone.
- Dentogingival (DG): Fan-shaped fibers extending from cementum into gingival connective tissue.
- Periosteogingival (PG): Extend from the periosteum.
- Intergingival (IG): Run mesiodistally along the dental arch, linking teeth.
- Intercircular (IC): Encircle several teeth, linking them together.
- Interpapillary (IP): Located in the papilla, connecting oral and vestibular papillae.
- Transgingival (TG): Extend from cementum to the cementoenamel junction (CEJ), running horizontally between teeth.
- Transeptal (TS): Extend from the cementum of one tooth to another, crossing the crestal bone.
Gingival Sulcus
- Depth in health: (This information is not provided in the text)
- Shape in health: (This information is not provided in the text)
- Other structures associated with the gingival sulcus include the periodontal ligament, cementum and alveolar bone.
Gingival Epithelium
- Three main areas: Oral epithelium, sulcular epithelium, and junctional epithelium.
Oral Epithelium
- Covers the outer surface of the free and attached gingiva, extending from the gingival margin to the mucogingival junction.
- Visible to the naked eye.
- Stratified squamous epithelium with layers: basal, prickle, granular, and keratinized.
- 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.
- Connects to underlying connective tissue in a wavy pattern.
Sulcular Epithelium
- Faces the tooth surface without contacting it.
- Thin, non-keratinized epithelium without rete pegs.
- Semi-permeable, allowing gingival crevicular fluid (GCF) flow from the connective tissue into the sulcus.
- Smooth interface with connective tissue in health (no wavy junction).
Junctional Epithelium
- Stratified squamous, non-keratinized epithelium.
- Attaches gingiva to the tooth surface.
- Length: 0.71-1.35 mm.
- Cell thickness varies coronally (15-30 cells) and apically (4-5 cells).
- High cell turnover rate compared to keratinized tissue.
Junctional Epithelium: Formation and Function
- Seals the opening created when teeth erupt through the epithelial sheet.
- Attachment to the tooth surface is via hemidesmosomes and the internal basal lamina (8-10 hemidesmosomes per micron coronally, 2 apically).
- Attachment to connective tissue is via hemidesmosomes.
- Functions: attachment, barrier, and host defense.
Cell Junctions
- Desmosomes: Connect neighboring epithelial cells and their cytoskeletons.
- Hemidesmosomes: Connect epithelial cells to the basal lamina.
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Description
This quiz covers the essential functions of gingival connective tissue, including its role in immune response and nutrient transport. It also explores the different types of supragingival connective tissue fibers and their specific functions in maintaining gingival integrity.
