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Questions and Answers
What mechanism allows the body to seal the opening created by the eruption of teeth?
What type of cell junction connects neighboring epithelial cells?
What is the primary purpose of the internal basal lamina?
Which statement correctly describes the attachment of epithelium to connective tissue?
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What specific structure primarily provides solidity to the gingiva?
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What is one of the primary functions of junctional epithelium?
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How many hemidesmosomes exist per micron at the coronal end of the junctional epithelium?
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What separates the epithelial cells from the gingival connective tissue?
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What is the main characteristic of the keratinized cell layer (stratum corneum)?
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Which feature distinguishes sulcular epithelium from junctional epithelium?
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What is gingival crevicular fluid (GCF)?
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Which of the following statements about junctional epithelium is correct?
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What is a characteristic of nonkeratinized epithelium in the context of junctional epithelium?
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Why is a junctional epithelium necessary for a tooth?
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How many cell layers does the junctional epithelium typically exhibit at its coronal portion?
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What does the presence of rete pegs indicate in epithelial tissue?
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What role does gingival connective tissue primarily play in maintaining oral health?
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Which supragingival fibre connects the cementum to the gingival connective tissue?
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Which statement about the transportation function of the gingival connective tissue is true?
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What is the primary immune function of gingival connective tissue?
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How do the interpapillary fibres contribute to gingival structure?
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What is the significance of the transeptal fibres in gingival health?
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What is the common shape of a healthy gingival sulcus?
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Which fibre type runs horizontally linking teeth together?
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Which of the following describes the structure of the oral epithelium?
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What is the primary function of the junctional epithelium?
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Which area of the gingival epithelium extends from the crest of the gingival margin to the mucogingival junction?
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What layer is NOT a part of the oral epithelium?
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Which component is not directly classified as part of gingival tissues?
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In the oral epithelium, which layer consists of flattened cells with increased keratinization?
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Which of the following best describes the sulcular epithelium?
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Which structure is essential for maintaining the integrity of the gingival tissues?
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Study Notes
Gingival Epithelium
- The gingiva is made up of three different anatomic areas of gingival epithelium:
- Junctional epithelium
- Sulcular epithelium
- Oral epithelium
Oral Epithelium
- Covers the outer surface of the free gingiva and attached gingiva
- Extends from the crest of the gingival margin to the mucogingival junction
- It is the only part of the periodontium that is visible to the naked eye.
- It is considered stratified squamous epithelium
- The layers are listed below in order from the deepest layer to the most superficial layer:
- Basal cell layer: Cube-shaped cells
- Prickle cell layer: Spine-like cells with large intercellular spaces. The cells of both the basal and prickle cell layers attach to each other with desmosomes.
- Granular cell layer: Flattened cells and increased intracellular keratin
- Keratinized cell layer (stratum corneum): Flattened cells with extensive intracellular keratin.
- Joins with the underlying connective tissue in a wavy pattern
Sulcular Epithelium
- Faces the tooth surface without being in contact with the tooth surface
- Thin
- Nonkeratinized epithelium
- Without rete pegs
- Semi permeable (but less so than JE) allowing fluid to flow from the gingival connective tissue into the sulcus. This fluid is known as the gingival crevicular fluid (GCF)
- In health, the sulcular epithelium joins the connective tissue at a smooth interface with no epithelial ridges (no wavy junction).
Junctional Epithelium
- Stratified squamous nonkeratinized epithelium
- Joins gingiva to the tooth surface
- Length 0.71 – 1.35mm
- Cell thickness coronally – 15-30 cells
- 4 -5 cells thick at apical zone
- High cell turnover
Function of Junctional Epithelium
- Attachment
- Barrier
- Host defense
Gingival Connective Tissue
- Provides solidity to the gingiva
- Attaches the gingiva to the cementum of the root and the alveolar bone.
- Also known as the lamina propria.
Functions of Gingival Connective Tissue
- Integrity and strength of gingival tissues – dense network
- Normal function of connective tissues
- Transportation of water, nutrients, metabolites, oxygen, etc., to and from the individual connective tissue cells occurs within the matrix
- Host response – immune response
Supragingival fibres of connective tissue
- AG: Alveologingival – Alveolar crest to gingival connective tissue
- C: Circular – Ring round coronally above crestal bone
- DG: Dentogingival – Cementum fan into gingival connective tissue
- PG: Periosteogingival – Fan from periosteum
- IG: Intergingival – Mesiodistal direction along whole dental arch linking teeth together
- IC: Intercircular – Encircle several teeth linking teeth together
- IP: Interpapillary – Located in the papilla connect oral & vestibular papilla
- TG: Transgingival – Cementum to CEJ and run horizontally linking teeth together
- TS: Transeptal – Cementum of one tooth to another tooth over crestal bone
Other structures covered in other lectures:
- Periodontal ligament
- Cementum
- Alveolar bone
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Description
This quiz covers the different areas of gingival epithelium, including junctional, sulcular, and oral epithelium. It discusses the structure and layers of oral epithelium, detailing its visibility and characteristics. Test your knowledge of the anatomy of the gingiva and its significance in dental health.
