Dentogingival Junction

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Biological Width

Distance of tissue that isolates alveolar bone from oral cavity

Healthy biological width

1 - 2 mm (1 mm of junctional epithelium and 1 mm of connective tissue proper)

Biological width is located

Between the base of the DGJ and the crest of the alveolar bone

Junctional epithelium (Epithelial attachment)

Formed after ameloblasts have created mature enamel and secreted a basal lamina. Definitive junctional epithelium is formed by remaining epithelial cells since ameloblasts are lost after eruption.

Definitive junctional epithelium is formed once

Erupting tooth reaches functional occlusion

Dentogingival Junction

Junction between tooth and gingiva

Importance of DGJ

1. Helps hold tooth in place 2. Part of Periodontium 3. Barrier to PDL space

The DGJ forms from

Reduced enamel epithelium

Oral epithelial tissue makes

Free gingiva

Two parts of DGJ

1. Sulcular epithelium 2. Junctional epithelium

DGJ is never seen

Clinically, because next to tooth

Two borders of sulcus space

1. Non-keratinized sulcular epithelium 2. Tooth

When is the first junctional epithelium established?

When the tooth first erupts into the oral cavity

Definitive junctional epithelium is established

When tooth reaches functional occlusion

What are the two basal laminas?

1. External Basal Lamina 2. Internal Basal Lamina

Which basal lamina is located next to the tooth?

Internal basal lamina

What type of oral mucosa is DGJ?

Lining mucosa (Non-keratinized)

What do the pegs and papilla look like in DGJ?

There are NO pegs or papilla in DGJ

What kind of junction is found between enamel and the superficial layer of juntional epithelium?

Hemidesmosomal

Internal Basal lamina lies between

The Junctional epithelium and the tooth

Reasons why junctional epithelium may recede

1. Age 2. Disease 3. Trauma 4. Malocclusion 5. Frenum attached too far coronally which pulls tissue

Which direction does junctional epithelium recede?

Apically

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