Created by Evian Chai
over 4 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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