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10 Cards in this Set
- Front
- Back
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What is the dentogingival (DG) junction?
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The junction between the gingival epithelium and the tooth surface.
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What is the clinical significance of this junction?
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If disturbed by plaque etc. it opens access to the underlying periodontium.
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What are the 3 phases of dentogingival junction formation?
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Pre-eruption, eruption, and post-eruption.
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What happens in each phase of this formation?
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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.
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How do the three cementum-enamel junctions come about?
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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.
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What are the two subdivisions of the DG epithelium?
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Sulcular (crevicular) epithelium (free gingiva, separated from tooth by sulcus 0.5 mm deep) and junctional epithelium.
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How is the junctional epithelium held to the enamel layer?
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A basal lamina is secreted over the enamel to allow hemidesmosomes to attach the epithelium to the tooth surface.
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How many basal laminae (basement membranes) are present in the junctional epithelium?
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Two.
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Distinguish between the free gingival, attached gingival and the mucogingival junction.
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Through fusion of the REE and oral epithelium.
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The rich vascularization of the gingival around the cervix of the tooth is supplied by vessels from 3 regions. What are they?
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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.
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