QUIZ 2 Enamel II Flashcards Preview

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Flashcards in QUIZ 2 Enamel II Deck (86)
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1

rods and interrod enamel geometry are directly linked to the geometry of what?

the individual ameloblasts

2

rods are continuous from the ___ to the ___

 inner enamel to the outer enamel

*uniform enamel at the innermost and outermost; no rods

3

describe the orientation of rods in relation to one another

inner 2/3 is somewhat interwoven, and the outer 1/3 is much straighter

4

the distal end of tomes' process directly forms what?

1 enamel rod (and surrounding interrod enamel)

5

___ is formed first, and makes a pit into which the ___ is synthesized

  • interrod enamel
  • enamel rod

6

dentin forms inwards, towards the ___

pulp

7

the ___ deliminates the surface area of the enamel

DEJ

8

enamel is formed ___ as a cap; the dentin is formed ___, making up most of the tooth body

  • outwards
  • inwards

9

is enamel formation simultaneous?

no; it forms apically

10

as the crown grows, there are new ameloblasts that come into play ___

cervically

11

which enamel proteins are responsible for enamel deposition?

ameloginins, ameloblastin, enamelin

12

which enamel proteins are involved in organic component degradation?

enamelysin, enamel matrix serine protease (kallikrein 4)

13

which enamel proteins are involved the basal lamina during maturation?

amelotin, odontogenic ameloblast associated protein (ODAM)

14

which protein is the main protein family in developing enamel (80-90%) and is only expressed while enamel is being produced; it restricts lateral HA crystal growth, preventing crustal fusion. the loss of function of this protein = no enamel rods

amelogenins

15

which protein is around 10% of the enamel organic content, is expressed all the way through to maturation, involves ameloblast adhesion to developing enamel, and its loss of function results is ameloblasts falling off (no enamel)?

ameloblastin

16

which protein is the least abundant (<5%) enamel protein (but largest), is only present at the leading edge of enamel deposition, and whose function is possibly crystal elongation; loss of function = no enamel

enamalin

17

which enamel protein is an MMP (MMP 20), is found during enamel deposition, chops up ameloblastin and enamelin; loss of function results in thin immature enamel, and is critical for the removal of organic component to allow increased mineralization?

enamelysin

18

which enamel protein is secreted during modulation events of enamel maturation, degrades amelogenins, and the loss of function results in immature enamel?

enamel matrix serine protease

19

the basal lamina doesn't seem to contain much, if any, ___, but instead has a variety of other proteins, including ___ and ___

  • collagen IV
  • ODAM and amelotin

20

describe how enamel acid etching is important clinically

  • fissure sealants
  • bonding restorative materials to enamel
  • cementing orthodontic materials to enamel

21

describe how enamel acid etching provides better bonding surface

  • it increases the porosity of enamel surface (infiltration of material into tissue)
  • also removes any debris clinging to the enamel surface

22

the mechanism of enamel acid etching is similar to ___

microbial incursions (acid attack)

23

enamel acid etching is accomplished by dissolving ___

enamel crystals

24

describe enamel etching

  • carbonated apatite in crystal core 
    • more prevalent and vulnerable in inner enamel
  • crystal ends are first to dissolve, then along core
  • effectively dissolves from the inside out

25

etching enamel doesn't always produce the same effect on the ___

surface

26

what are the 3 possible patterns of acid etching?

  • type I -  most common
    • preferential removal of rods
  • type II - reverse of type I
    • interrod enamel removed
  • type III - least frequent
    • irregular and indiscriminate pattern

27

the three possible etching patterns are most likely due to a difference in what?

  • the orientation of rod vs interrod enamel crystals - acid etched surface enamel
    • rod crystal ends are perpendicular to enamel surface
    • interrod crystal ends not generally exposed

 

28

what is attrition?

tooth wear

29

enamel is non-vital, meaning what?

it cannot be replaced (no more ameloblasts)

30

attrition of enamel may expose ___

dentin