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10 Cards in this Set

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What is the dentogingival (DG) junction?
The junction between the gingival epithelium and the tooth surface.
What is the clinical significance of this junction?
If disturbed by plaque etc. it opens access to the underlying periodontium.
What are the 3 phases of dentogingival junction formation?
Pre-eruption, eruption, and post-eruption.
What happens in each phase of this formation?
Pre-eruption - reduced enamel epithelium forms/condenses; eruption - fusion of REE and oral epithelium as well as their respective basal laminae; and post-eruption - complete fusion of REE and oral epithelium into junctional epithelium.
How do the three cementum-enamel junctions come about?
Touching occurs when the epithelium of the crown is retained while the root looses its; gapping occurs when the epithelial root sheet does not initially degenerate leaving no cementum but naked dentin; overlapping occurs when the cervical REE breaks down along with the epithelial root sheath and cementoblast cover the exposed enamel.
What are the two subdivisions of the DG epithelium?
Sulcular (crevicular) epithelium (free gingiva, separated from tooth by sulcus 0.5 mm deep) and junctional epithelium.
How is the junctional epithelium held to the enamel layer?
A basal lamina is secreted over the enamel to allow hemidesmosomes to attach the epithelium to the tooth surface.
How many basal laminae (basement membranes) are present in the junctional epithelium?
Two.
Distinguish between the free gingival, attached gingival and the mucogingival junction.
Through fusion of the REE and oral epithelium.
The rich vascularization of the gingival around the cervix of the tooth is supplied by vessels from 3 regions. What are they?
Free gingiva extends down to the end of the sulcus; attached gingiva is attached to alveolar bone; and the mucogingival junction is the junction between the attached gingiva and the alveolar mucosa.