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Dentogingival Jnctn
| Question | Answer |
|---|---|
| What is the dentogingival junction? | the junction between the gingival epithelium and the tooth surface |
| What is the clinical significance of the Dentogingival junction? | If disturbed by plaque, the underlying CT and periodontum(bone,cementum,+PDL) are exposed to the microorganisms and periodontial disease ensues which could lead to the death of the tooth |
| What are the 3 phases of dentogingival junction formation? | 1. Pre-eruption, 2.Eruption 3.Post-Eruption |
| What happens in the Pre-Eruption Phase of Dentogingival junction formation? | REE forms/ condenses |
| What happens in the Eruption Phase of Dentogingival Junction formation? | fusion of REE and oral epithelium as well as their respective basal laminae |
| What happens in the Post-Eruption Phase of the dentogingival junction formation? | complete fusion of REE and oral epithelium into junctional epithelium (a basal lamina separates the new junctional epithelium from the tooth surface) |
| How does the "Touching" morphology occur | Touching occurs when the epithelium of the crown is retained while the root looses its---a perfect edge to edge relationship btwn enamel and cementum is established |
| How does the "Gapping" morphology occur | Gapping occurs when the epithelial root sheeth does not initially degenerate leaving no cementum but naked dentin; |
| How does the "Overlapping" morphology occur | overlapping occurs when the cervical REE breaks down along with the epithelial root sheath and cementoblast cover the exposed enamel. |
| 2 subdivisions of the dentogingival epithelium? | 1. sulcular epithelium 2.Junctional Epithelium |
| What is sulcular epithelium? | free gingiva, separated from tooth by sulcus 0.5 mm deep |
| How is 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(BMS) are present in the junctional epithelium? | 2 |
| how do these multiple membranes of the junctional epithelium come about? | Through fusion of the REE and oral epithelium |
| what is free gingiva? | Free gingiva extends down to the end of the sulcus (closest layer to teeth) |
| What is Attached gingiva? | attached gingiva is attached to alveolar bone; |
| What is the mucogingival junction? | the mucogingival junction is the junction between the attached gingiva and the alveolar mucosa |
| The rich vascularization of the gingiva around the cervix of the tooth is supplied by vessesls from 3 regions. What are they? | 1. PDL 2.Alveolar bone 3.Periosteum of the cortical plates ****bleeding occurs easily in this location with the slightest inflammatory state or plaque accumulation***** |