Dento-Gingival Junction in Oral Mucous Membrane

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Questions and Answers

What is the thickness of the junctional epithelium coronally?

30-50 cells

15-30 cells (correct)

1-3 cells

5-10 cells

What is the primary source of the junctional epithelium?

Oral epithelium

Gingival epithelium

Enamel epithelium

Reduced dental epithelium (correct)

What is special about the interface between the epithelium and lamina propria in the gingival sulcus?

It has epithelial ridges

It has a rough interface

It has a basement membrane

It has a smooth interface (correct)

What is the characteristic of the cells in the junctional epithelium?

They have large intercellular spaces Signup and view all the answers

What is the function of the junctional epithelium?

To facilitate the passage of crevicular fluid and defense cells Signup and view all the answers

What is the rate of turnover of the junctional epithelium?

5-6 days Signup and view all the answers

What is the characteristic of the lamina propria in the dento-gingival junction?

It is more cellular than other parts of the gingiva Signup and view all the answers

What is the function of hemidesmosomes in the dento-gingival junction?

To attach the epithelial cells to the enamel or cementum Signup and view all the answers

What can be seen in the intercellular spaces of healthy gingival tissue?

Neutrophils Signup and view all the answers

What is the term for the combination of hemidesmosomes and basal lamina in the dento-gingival junction?

Attached apparatus Signup and view all the answers

What is unique about the junctional epithelium?

It has two basal laminae Signup and view all the answers

What is the term for the process of gingival recession due to disease?

Gingival recession Signup and view all the answers

At what age does the second stage of passive eruption typically persist until?

20-30 years Signup and view all the answers

What is the anatomical landmark that marks the apical end of the clinical crown during the first stage of passive eruption?

Cementoenamel junction (CEJ) Signup and view all the answers

What is the term for the shift of the dento-gingival junction?

Dento-gingival shift Signup and view all the answers

In primary teeth, until when does the first stage of passive eruption typically occur?

1 year before shedding Signup and view all the answers

Study Notes

Dento-Gingival Junction

The dento-gingival junction is formed by the interaction of the tooth and the gingiva
Histogenesis of dento-gingival junction involves the formation of a primary dentogingival junction (from reduced enamel epithelium) and a secondary dentogingival junction (from oral epithelium)

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) and is initially derived from the rapidly replaced reduced enamel epithelium
The lamina propria shows many capillaries and appears to be more cellular than other parts of the gingiva
The epithelial cells are separated from the lamina propria by a smooth basement membrane
The junctional epithelium cells are joined by few desmosomes and have large intercellular spaces, allowing crevicular fluid and defense cells to pass through

Epithelial Attachment

The cells of the junctional epithelium attach themselves to the enamel or cementum by hemidesmosomes within the cell and a basal lamina produced by the epithelial cells
This combination of hemidesmosomes and basal lamina is known as the attached apparatus or epithelial attachment
The basal lamina in contact with the tooth is termed the internal basal lamina, and the other surface of the junctional epithelium in contact with the lamina propria is the normal basal lamina (external basal lamina)
The junctional epithelium is unique in having two basal laminae

Gingival Sulcus and Dento-gingival Junction

The gingival sulcus is lined by non-keratinized stratified squamous epithelium, which is thinner than the epithelium of the gingiva and lacks epithelial ridges
The epithelium has a smooth interface with the lamina propria and is continuous with the gingival epithelium and attachment epithelium
All three epithelia have a continuous basal lamina

Stages of Passive Eruption

First stage: till 1 year before shedding in deciduous teeth and till 20-30 years in permanent teeth
Second stage: persists to 40 years
Third stage: transitory
Fourth stage: gingival recession (pathologic) till loss

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Description

This quiz focuses on the histogenesis of the dento-gingival junction, including epithelial plugs and attachment epithelium. It's a crucial topic in oral pathology and oral mucous membrane studies.