What is junctional epithelium?

What is junctional epithelium?

The junctional epithelium (JE) is an epithelial component that is directly attached to the tooth surface and has a protective function against periodontal diseases. In this study, we determined the origin of the JE using a bioengineered tooth technique.

What type of epithelium is junctional epithelium?

nonkeratinized stratified squamous epithelium
The junctional epithelium, a nonkeratinized stratified squamous epithelium, lies immediately apical to the sulcular epithelium, which lines the gingival sulcus from the base to the free gingival margin, where it interfaces with the epithelium of the oral cavity.

What are the functions of the junctional epithelium?

Background and objective: The junctional epithelium provides the front-line defense against periodontal bacterial infection. The migration of neutrophils into the junctional epithelium might represent a protective reaction against bacterial infections.

What forms the junctional epithelium?

The junctional epithelium comes from the reduced enamel epithelium (REE) during the development of the tooth. This occurs before the tooth erupts and after the enamel matures. The ameloblasts produce a basal lamina on the surface of the tooth which serves as a part of the primary EA.

What is the length of junctional epithelium?

The junctional epithelium (JE) is approximately 1–2 mm in coronoapical dimension, and surrounds the neck of each tooth.

How long is the junctional epithelium?

The mean biologic width was found to be 1.91 mm, which consisted of junctional epithelium (1.14 mm) and connective tissue attachment (0.77 mm).

What does junctional epithelium attach to?

The junctional epithelium (JE) is attached to the tooth surface by hemidesmosomes, which constitutes the front-line defense against periodontal bacterial infection.

Is junctional epithelium permeable?

Junctional epithelium receives a rich sensory nerve and has a high rate of cell turnover. Long junctional epithelium can be produced rapidly during wound healing, due to high proliferative activity. Peri-implant epithelium might be a poorly adhered and permeable epithelium.

What is the junctional epithelium of the tooth?

The junctional epithelium (JE) adjacent to the tooth is that part of the gingiva which attaches the connective tissue to the tooth surface (Fig. 2.14). It forms a band 2—3 mm wide around the tooth, and is approximately 15—30 cells thick coronally and tapers to a single cell apically. This attachment is continuously being renewed throughout life.

What is the role of the junctional epithelium in disease initiation?

The conversion of the junctional to pocket epithelium, which is regarded as a hallmark in disease initiation, has been the focus of intense research in recent years. Research has shown that the junctional epithelial cells may play a much more active role in the innate defense mechanisms than previously assumed.

How many layers are there in junctional epithelium?

The junctional epithelium, despite being considered stratified epithelia, has just 2 functionally recognized layers: one basal and one suprabasal (27). Junctional epithelium is the tissue with the highest turnover of all oral epithelia (4-6 days) but with very limited differentiation.

What is the difference between junctional and sulcular epithelium?

Lysosomal bodies can be found in large numbers in junctional epithelial cells (27). Unlike the oral epithelium, the sulcular epithelium does not contain a granular stratum but contains a greater number of layers with more differentiated cells than the junctional epithelium with slower proliferation (6-12 days) (29).