22331307
Description
Flashcards by Evian Chai, updated more than 1 year ago
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Created by Evian Chai
over 5 years ago
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| Question | Answer |
| Why is there radiolucency on the enamel when it has caries? | This is due to the loss of mineral |
| What type of line is the neonatal line? | Line of Retzius Formed during birth |
| What two proteins do ameloblasts produce? | 1. Amelogenin 2. Nonamelogenin |
| What technique allows for the adhesion of composites? | Acid etch technique |
| What occurs to the enamel when caries occurs? | Demineralisation of enamel |
| What is the composition of enamel? | 96% inorganic hydroxyapatite 4% organic matrix (eg. proteins) |
| What is enamel? | The hardest known biological material Located on the outer surface of the tooth |
| What do the residual enamel epithelium and oral epithelium fuse together to become? | Junctional epithelium |
| What layer of the epithelium do ameloblasts become after they become shorter? | Residual Enamel Epithelium |
| What are Hunter-Schreger Bands? What are they caused by? What is their purpose? | 1. Sinous course of prisms from Enamel-Dentin Junction to surface 2. Caused by ameloblasts/prisms changing angles 3. Stress relieving mechanism |
| What are enamel prisms in the shape of? What do they contain? | 1. In a horseshoe shape pointed down 2. 10,000 Hydroxyapatite crystals |
| What are diazones/parazones? | Gaps between enamel prisms |
| Tufts are what? What are most obvious here? | 1. Hypomineralised ribbon-like structures extending from DEJ to enamel 2. Hunter Scrager bands |
| Tomes Process Pits are | Pits on enamel |
| What are 5 surface features on enamel? | 1. Mamillons 2. Perikymata 3. Tomes Process Pits 4. Pearls 5. Fractures |
| Retzius Lines are caused by | Enamel matrix secretion by ameloblasts slowing down every 7-9 days and changing direction - represented by DARK diagonal bands |
| Perikymata are? They are caused by? | 1. Grooves/waves on surface of teeth 2. Caused by Retzius Lines |
| Pearls are | Cervical pumps on teeth |
| Mamillons are | The tip of incisors |
| What are lamellae? | Cracks from the EDJ to the surface |
| The enamel dentin junction is unique because | It is a scalloped junction (looks wavy) Allows for higher stress tolerance |
| Cross striations are caused by... | Daily activity of ameloblasts laying down more/less mineralised enamel |
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