Podcast
Questions and Answers
Which anatomic area of the gingival epithelium is visible to the unaided eye?
Which anatomic area of the gingival epithelium is visible to the unaided eye?
- Connective tissue
- Oral epithelium (correct)
- Sulcular epithelium
- Junctional epithelium
Which type of epithelium is the oral epithelium?
Which type of epithelium is the oral epithelium?
- Stratified squamous (correct)
- Simple cuboidal
- Transitional
- Pseudostratified columnar
What is the deepest layer of the oral epithelium?
What is the deepest layer of the oral epithelium?
- Prickle cell layer
- Basal cell layer (correct)
- Keratinized cell layer
- Granular cell layer
Which layer of the oral epithelium contains spine-like cells?
Which layer of the oral epithelium contains spine-like cells?
What is the shape of the cells in the basal cell layer?
What is the shape of the cells in the basal cell layer?
In which layer of the oral epithelium is increased intracellular keratin found?
In which layer of the oral epithelium is increased intracellular keratin found?
Which structures attach the cells of the basal and prickle cell layers to each other?
Which structures attach the cells of the basal and prickle cell layers to each other?
From where to where does the oral epithelium extend?
From where to where does the oral epithelium extend?
What is the primary function of the junctional epithelium?
What is the primary function of the junctional epithelium?
By what mechanism do teeth penetrate the epithelial sheet?
By what mechanism do teeth penetrate the epithelial sheet?
What is the term for the cell junction that connects two neighboring epithelial cells?
What is the term for the cell junction that connects two neighboring epithelial cells?
What structure attaches epithelial cells to the basal lamina?
What structure attaches epithelial cells to the basal lamina?
What is another name for gingival connective tissue?
What is another name for gingival connective tissue?
The internal basal lamina is located between epithelial cells and what?
The internal basal lamina is located between epithelial cells and what?
Which type of epithelium faces the tooth surface without being in contact with it?
Which type of epithelium faces the tooth surface without being in contact with it?
What is a function of the junctional epithelium?
What is a function of the junctional epithelium?
The sulcular epithelium allows fluid to flow from the gingival connective tissue into the sulcus. What is this fluid called?
The sulcular epithelium allows fluid to flow from the gingival connective tissue into the sulcus. What is this fluid called?
What kind of interface exists in healthy sulcular epithelium?
What kind of interface exists in healthy sulcular epithelium?
What type of epithelium is the junctional epithelium?
What type of epithelium is the junctional epithelium?
What is the approximate length of the junctional epithelium?
What is the approximate length of the junctional epithelium?
How many cells thick is the junctional epithelium at the coronal zone?
How many cells thick is the junctional epithelium at the coronal zone?
Which of the following is a characteristic of junctional epithelium?
Which of the following is a characteristic of junctional epithelium?
Which of the following is a function of the gingival connective tissue?
Which of the following is a function of the gingival connective tissue?
Where does the transportation of water, nutrients, and oxygen occur for connective tissue cells?
Where does the transportation of water, nutrients, and oxygen occur for connective tissue cells?
Which supragingival fiber extends from the alveolar crest to the gingival connective tissue?
Which supragingival fiber extends from the alveolar crest to the gingival connective tissue?
What is the function of the circular supragingival fibers?
What is the function of the circular supragingival fibers?
Which fibers run from the cementum and fan into the gingival connective tissue?
Which fibers run from the cementum and fan into the gingival connective tissue?
From where do the periosteogingival fibers originate?
From where do the periosteogingival fibers originate?
Which fibers run in a mesiodistal direction along the dental arch, linking teeth together?
Which fibers run in a mesiodistal direction along the dental arch, linking teeth together?
Which fibers extend from the cementum of one tooth to the cementum of an adjacent tooth over the alveolar crest?
Which fibers extend from the cementum of one tooth to the cementum of an adjacent tooth over the alveolar crest?
Flashcards
Gingival Epithelium Areas
Gingival Epithelium Areas
The three anatomic areas of the gingival epithelium are the oral epithelium, the sulcular epithelium, and the junctional epithelium.
Oral Epithelium Location
Oral Epithelium Location
Covers the outer surface of the free and attached gingiva, extending from the gingival margin to the mucogingival junction.
Oral Epithelium Type
Oral Epithelium Type
Stratified squamous epithelium, composed of basal, prickle, granular, and keratinized cell layers.
Basal Cell Layer
Basal Cell Layer
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Prickle Cell Layer
Prickle Cell Layer
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Granular Cell Layer
Granular Cell Layer
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Keratinized Cell Layer
Keratinized Cell Layer
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Desmosomes
Desmosomes
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Sulcular Epithelium
Sulcular Epithelium
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Sulcular Epithelium properties
Sulcular Epithelium properties
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Gingival Crevicular Fluid (GCF)
Gingival Crevicular Fluid (GCF)
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Junctional Epithelium
Junctional Epithelium
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Function of Junctional Epithelium
Function of Junctional Epithelium
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Nonkeratinized vs. Keratinized
Nonkeratinized vs. Keratinized
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Connective Tissue Connection
Connective Tissue Connection
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Junctional Epithelium Defense
Junctional Epithelium Defense
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Internal Basal Lamina
Internal Basal Lamina
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Hemidesmosome
Hemidesmosome
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External Basal Lamina
External Basal Lamina
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Gingival Connective Tissue
Gingival Connective Tissue
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Lamina Propria
Lamina Propria
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Gingival Connective Tissue Functions
Gingival Connective Tissue Functions
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Alveologingival Fibers (AG)
Alveologingival Fibers (AG)
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Circular Fibers (C)
Circular Fibers (C)
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Dentogingival Fibers (DG)
Dentogingival Fibers (DG)
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Periosteogingival Fibers (PG)
Periosteogingival Fibers (PG)
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Intergingival Fibers (IG)
Intergingival Fibers (IG)
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Intercircular Fibers (IC)
Intercircular Fibers (IC)
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Interpapillary Fibers (IP)
Interpapillary Fibers (IP)
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Study Notes
- The lecture covers the histology of the gingiva within oral and dental science.
- The learning outcomes include identifying gingival epithelium areas, describing anatomical structures, and understanding gingival connective tissue function.
- Other structures that are part of the gingiva are periodontal ligament, cementum, and alveolar bone
Dento-Gingival Junction
- The dento-gingival junction has three areas of epithelium: junctional, sulcular, and oral.
Oral Epithelium
- It covers the outer surface of the free and attached gingiva.
- It extends from the crest of the gingival margin to the mucogingival junction.
- The oral epithelium is the only unaided-eye visible segment of the periodontium.
- It joins with underlying connective tissue in a wavy pattern.
- It is a stratified squamous epithelium.
- Going from the deepest to most superficial layer there is:
- A basal cell layer of cube-shaped cells
- A prickle cell layer with spine-like cells that have large intercellular spaces
- A granular cell layer with flattened cells and increased intracellular keratin
- A keratinized cell layer (stratum corneum) of flattened cells with extensive intracellular keratin
Sulcular Epithelium
- The epithelium faces the tooth surface but does not come into direct contact with the tooth surface.
- It's comparatively thin
- It is nonkeratinized epithelium.
- It doesn't have rete pegs.
- It is semi-permeable to allow fluid to flow from the gingival connective tissue into the sulcus, creating gingival crevicular fluid (GCF).
- It appears as a smooth interface, rather than a wavy junction, because it joins the connective tissue in a healthy state without epithelial ridges
Junctional Epithelium
- It is stratified squamous nonkeratinized epithelium.
- It joins gingiva to the tooth surface.
- It has a length of 0.71 – 1.35mm
- The cell thickness coronally is 15-30 cells, and 4-5 cells thick at the apical zone.
- It has a high cell turnover.
- The body attempts to seal the opening produced by teeth penetrating a continuous sheet of epithelium during eruption by attaching epithelium.
- It has closely packed epithelial cells that are linked to neighboring cells by desmosomes or cell junctions
- Internal Basal Lamina is the thin layer of extracellular matrix between epithelial cells and the tooth surface
- External Basal Lamina is the thin layer of the extracellular matrix between epithelial cells and the gingival connective tissue.
- Attachment to the tooth surface occurs through hemidesmosomes, the cell junction, and the internal basal lamina.
- There are 8-10 hemidesmosomes per micron at the coronal end, and 2 per micron at the apical end
- Attachment to connective tissue occurs with hemidesmosomes and the external basal lamina.
- Cell junctions are comprised Desmosomes to connect neighboring epithelial cells and their cytoskeletons, and Hemidesmosomes to connect epithelial cells to the basal lamina
Functions
- Attachment
- Barrier
- Host defense
Gingival Connective Tissue
- The gingival connective tissue of the free and attached gingiva provides solidity to the gingiva.
- It attaches the gingiva to the cementum of the root and the alveolar bone.
- Known as the lamina propria.
- The gingival connective tissue lends integrity and strength due to its dense network.
- It also transports water, nutrients, metabolites, oxygen, etc., to and from the individual connective tissue cells within the matrix and provides a Host immune response.
Supragingival Fibres
- Supragingival fibers are connective tissues, and include:
- Alveologingival: From the alveolar crest extending to the gingival connective tissue.
- Circular: Ring around coronally above the crestal bone.
- Dentogingival: From the cementum fan to the gingival connective tissue.
- Periosteogingival: Fan from the periosteum.
- Intergingival: Mesiodistal direction along the whole dental arch linking teeth together.
- Intercircular: Encircle several teeth by linking teeth together.
- Interpapillary: Located in the papilla connect oral & vestibular papilla.
- Transgingival: Connects cementum to CEJ and runs horizontally to link teeth.
- Transeptal: Binds cementum of one tooth with cementum of another over crestal bone
Gingival sulcus
- In health, the gingival sulcus depth is about 0.69mm
Periodontium
- Tissues included are gingiva, cementum, periodontal ligament, and alveolar bone
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Description
This quiz covers the anatomy of gingival and oral epithelium. It includes questions about layers, cell types, and functions. Test your knowledge of oral histology.
