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UKCD Histo Dento Jun

learning objective answers fro Dentogingival junction

QuestionAnswer
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 DG formation? Pre-eruption, eruption, and post-eruption.
What happens at the Pre-eruption phase? reduced enamel epithelium forms/condenses
What happens at the eruption phase? fusion of REE and oral epithelium as well as their respective basal lamina
What happens at the post-eruption phase? complete fusion of REE and oral epithelium into junctional epithelium.
How does the touching cementum-enamel junctions come about? Touching occurs when the epithelium of the crown is retained while the root looses its
How does the gapping cementum-enamel junctions come about? gapping occurs when the epithelial root sheet does not initially degenerate leaving no cementum but naked dentin
How does the overlapping cementum-enamel junctions come about? 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 lamina (basement membranes) are present in the junctional epithelium? Two.
How do these multiple basement membranes comes about? through fusion of the REE and oral epithelium.
Distinguish between the free gingiva, attached gingival and the mucogingival junction? 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.
The rich vascularization of the gingival around the cervix of the tooth is supplied by vessles from 3 regions, what are they? periodontal ligament, alveolar bone, and periosteum of the cortical plates
Created by: wiechartm