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Oral Biology > Enamel > Flashcards

Enamel Flashcards

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1
Q

What pathway do enamel prisms follow?

A

undulating path of ameloblasts 90 degrees to the ADJ.

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2
Q

Where do you find gnarled enamel?

A

at the cusps

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3
Q

What does gnarled enamel appear as?

A

prisms appear twisted around each other

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4
Q

What does gnarled enamel give the tooth cusp?

A

strength

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5
Q

Why do you get a better bond with subsurface enamel?

A

better etch pattern

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6
Q

What do incremental lines represent?

A

weekly growth

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7
Q

How may incremental lines be accentuated?

A

is systematically disturbed at birth

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8
Q

What neonatal lines?

A

when incremental lines are disturbed at birth

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9
Q

What are the shallow furrows where the striae reach the surface?

A

Perikymata

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10
Q

What are the ridges between perikymata?

A

Imbrication lines of Pickerill

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11
Q

What are enamel spindles?

A

dentinal tubules that extend into enamel

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12
Q

Where are enamel spindles best developed?

A

at the cusp

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13
Q

What is the relationship between enamel spindles to enamel prisms?

A

long axis of spindles is perpendicular to enamel prisms

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14
Q

What are the 3 origins of lamella?

A
  1. developmental
  2. acquired
  3. preparation artefact
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15
Q

What are tufts?

A

hypo mineralised and run in the same direction as enamel prisms

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16
Q

Where are tufts found?

A

at the DEJ

17
Q

What are the 4 zones of enamel caries?

A
  • surface zone
  • body of lesion
  • dark zone
  • translucent zone
18
Q

What is the 1st carious change?

A

translucent zone

19
Q

What are the features of the translucent zone?

A

few large pores
loss of 1-2% mineral

20
Q

What gives the translucent zone its appearance?

A

few large pores so resin (quinoline) gets in

21
Q

What are features of the dark zone?

A

5-10% porosity
large and small pores

22
Q

What gives the dark zone its appearance?

A

not penetrated by resin

23
Q

What are features of the body of lesion?

A

25-50% porosity

24
Q

What appearance does the body of the lesion have and why?

A

enamel is relatively translucent as resin permeates

25
Q

What part of the lesion is visible on a radiograph and what is the disadvantage of this?

A

the body of the lesion - underestimates the extent

26
Q

What are the features of the surface zone?

A

highly mineralised
1-2% porosity

27
Q

What makes the surface zone highly mineralised?

A

high fluoride content
redeposition of mineral dissolved from deeper layers

Oral Biology (4 decks)

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