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Dentogingival junction

Dentogingival junction. BDS III Lectures Dr. S. Singh . Three zones of the gingival epithelium . Crevicular (or sulcular ) epithelium. Junctional epithelium . Oral epithelium . Dentogingival junction .

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Dentogingival junction

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  1. Dentogingival junction BDS III Lectures Dr. S. Singh

  2. Three zones of the gingival epithelium Crevicular (or sulcular) epithelium Junctional epithelium Oral epithelium

  3. Dentogingival junction • Defined as the oral epithelium that extends from the mucogingival junction to the gingival margin where crevicular/sulcular epithelium lines the sulcus • At the base of the sulcus connection between gingiva and tooth is mediated with JUNCTIONAL EPITHELIUM

  4. Junctional epithelium

  5. Derived from REE • In health, JE lies against the enamel and extends to the CEJ • Base of gingival crevice is the free surface of the JE • JE is very fragile and does not form a barrier against probing • Cells are large and loosely connected together • Attach via hemidesmosomes to the tooth surface, with fewer tonofilaments and desmosomal junctions • About 40 cells long from apex to sulcular surface • Undergoes constant renewal of cells by cell division, with no keratinized surface epithelium

  6. Mild gingival inflammation:

  7. In health or mild gingival inflammation, sulcus has a depth of 0.5-3mm • Average of 1.8-2mm • Any depth that is greater than 3mm is regarded as PATHOLOGIC (periodontal pocket) • The sulcus contains fluid that passes through the JE – purpose of the fluid • Defense mechanism of the DGJ • Washes the crevice, carrying out shed epithelial cells, leucocytes, bacteria and other debris • Plasma proteins may influence epithelial attachment to the tooth • Contains antimicrobial agenst (lysozymes) • Carries PMN’s, leucocytes, macropahges, immunoglobulins

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