Flashcards
OCB02-1014 Structure and function of enamel
Flashcards do conjunto (22)
- 1Why is there radiolucency on the enamel when it has caries?This is due to the loss of mineral
- 2What type of line is the neonatal line?Line of Retzius
Formed during birth - 3What two proteins do ameloblasts produce?1. Amelogenin
2. Nonamelogenin - 4What technique allows for the adhesion of composites?Acid etch technique
- 5What occurs to the enamel when caries occurs?Demineralisation of enamel
- 6What is the composition of enamel?96% inorganic hydroxyapatite
4% organic matrix (eg. proteins) - 7What is enamel?The hardest known biological material
Located on the outer surface of the tooth - 8What do the residual enamel epithelium and oral epithelium fuse together to become?Junctional epithelium
- 9What layer of the epithelium do ameloblasts become after they become shorter?Residual Enamel Epithelium
- 10What 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 - 11What are enamel prisms in the shape of? What do they contain?1. In a horseshoe shape pointed down
2. 10,000 Hydroxyapatite crystals - 12What are diazones/parazones?Gaps between enamel prisms
- 13Tufts are what? What are most obvious here?1. Hypomineralised ribbon-like structures extending from DEJ to enamel
2. Hunter Scrager bands - 14Tomes Process Pits arePits on enamel
- 15What are 5 surface features on enamel?1. Mamillons
2. Perikymata
3. Tomes Process Pits
4. Pearls
5. Fractures - 16Retzius Lines are caused byEnamel matrix secretion by ameloblasts slowing down every 7-9 days and changing direction
- represented by DARK diagonal bands
- 17Perikymata are? They are caused by?1. Grooves/waves on surface of teeth
2. Caused by Retzius Lines - 18Pearls areCervical pumps on teeth
- 19Mamillons areThe tip of incisors
- 20What are lamellae?Cracks from the EDJ to the surface
- 21The enamel dentin junction is unique becauseIt is a scalloped junction (looks wavy)
Allows for higher stress tolerance - 22Cross striations are caused by...Daily activity of ameloblasts laying down more/less mineralised enamel
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- OCB FlashCards sobre OCB02-1014 Structure and function of enamel, criado por Evian Chai em 26-04-2020.
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