16 Questions
What is the characteristic of the intercellular spaces in the junctional epithelium cells?
Large intercellular spaces
What is the function of hemidesmosomes in the junctional epithelium cells?
To attach to the tooth
What is the term for the combination of hemidesmosomes and basal lamina?
Attached apparatus
What is the unique feature of the junctional epithelium?
Having two basal laminae
What is the term for the basal lamina in contact with the tooth?
Internal basal lamina
What is the term for the shift of the Dento-Gingival Junction?
Gingival recession
During what period does the first stage of gingival recession occur in permanent teeth?
From 20-30 years
What is the duration of the second stage of gingival recession?
Up to 40 years
What is the origin of the junctional epithelium?
Reduced enamel epithelium
What is the characteristic of the interface between the epithelium and lamina propria?
Interface with smooth basement membrane
What is the thickness of the junctional epithelium coronally?
15-30 cells thick
What is the characteristic of the lamina propria in the dento-gingival junction?
It appears to be more cellular than other parts of the gingiva
What is the rate of turnover of the junctional epithelium?
In the order of 5-6 days
What is the characteristic of the gingival sulcus epithelium?
Nonkeratinized stratified squamous epithelium
What is the thickness of the junctional epithelium apically?
1-3 cells thick
What are the layers of cells in the junctional epithelium?
A single layer of cuboidal cells and several layers of flattened cells
Study Notes
Histological Structure of Junctional Epithelium
- Junctional epithelial cells are connected by few desmosomes and have large intercellular spaces, allowing for the passage of crevicular fluid and defense cells.
- Healthy gingival tissue may exhibit neutrophils in the intercellular spaces, indicative of its protective role.
Histology of Dento-Gingival Junction
- Basal cell layer consists of superficial flat cells, hemidesmosomes, and external basal lamina.
- Lamina propria is separated from the epithelial cells by a smooth basement membrane.
- Internal basal lamina is in contact with the tooth, and external basal lamina is in contact with the lamina propria.
Attached Apparatus (Epithelial Attachment)
- Junctional epithelial cells attach to the enamel or cementum by hemidesmosomes and a basal lamina produced by the epithelial cells.
Gingival Recession (Passive Eruption)
- Gingival recession occurs in two stages: first stage until the age of 1 year in primary teeth and until 20-30 years in permanent teeth, and second stage persisting up to 40 years.
Oral Mucous Membrane: Dentogingival Junction
- The junctional epithelium is unique in having two basal laminae.
Histogenesis of Dento-Gingival Junction
- Desmolytic enzymes break down the epithelial plug, forming the primary D.G.J.
- Reduced dental epithelium forms the primary attachment epithelium, which later forms the secondary attachment epithelium.
Gingival Sulcus and Dentogingival Junction
- Gingival sulcus is lined by non-keratinized stratified squamous epithelium, which is thinner than epithelium of gingiva and lacks epithelial ridges.
Histology of Dento-Gingival Junction
- The junctional epithelium is 15-30 cells thick coronally and 1-3 cells thick apically.
- It consists of two zones: a single cell layer of cuboidal cells (stratum germinativum) and several layers of flattened cells.
- The junctional epithelium has a high rate of turnover (5-6 days).
- It is initially derived from the rapidly replaced reduced enamel epithelium.
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