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BDS2 BAMS Oral Biology > Enamel > Flashcards

Flashcards in Enamel Deck (58)
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1

what is the function of enamel

resists abrasion

2

what are features of enamel

brittle
varies in thickness
translucent
transparency

3

what does enamel cover

tooth crown

4

what is enamel supported by

dentine

5

what happens if enamel is unsupported

will fail

6

what does translucency of enamel mean

it reflects colors and where the colour is a different place in the dentine due to the shape of the dentinal tubules

7

what does transparency of enamel increase with

mineralization

8

what is enamels thickness based upon

its function

9

why is the enamel on deciduous teeth thinner

they spend less time in the mouth

10

which is more mineralized - surface or deeper enamel

surface

11

when does surface and deeper enamel have the same level of mineralization

when it erupts

12

what is the purpose of a fissure sealant

protect the surface while it is still maturing

13

Where does the hardness of enamel decrease

cervical regions

14

what is hardness of enamel associated with

fragility of enamel
receiving attack from caries

15

what part of the tooth is more prone to recurrent caries

cervical

16

what is the basic unit of enamel

enamel rod/prism

17

what is the dimensions of the enamel rod

5 micrometres x 2.5mm (length of enamel)

18

where does the rod run from

ADJ to the surface

19

what does the rod contain

a high concentration of hydroxyapatite crystallites (more than 106)

20

what is the arrangement of rods

key holes

21

what are cross striations

consequence of daily growth of the rod when it was created

22

what is the daily growth of rods

4 micrometers

23

what is brown transverse striae

consequence of the weekly growth of the rods

24

what surface is more prone to etching

side surface of crystallites

25

what is the distinction between head and tail regions caused by

ariations in the orientations of the crystallites in different parts of the rod – there is no real space between the rods, this space is just a difference in orientation of the crystallites

26

what is the weight and volume of hydroxyapatite in enamel

weight - 95%
volume - 90%

27

what is the weight and volume of water in enamel

weight - 4%
volume - 5-10%

28

what is the weight and volume of organic matrix in enamel

weight - 1%
volume - 1-2%

29

what does the organic matrix consist of

proteins

30

what are the proteins in the organic matrix

amelogenins
enamelins
petptides
amino acids