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UKCD Histo Dento Jun
learning objective answers fro Dentogingival junction
| Question | Answer |
|---|---|
| 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
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