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HISTOLOGY > Dental enamel > Flashcards

Dental enamel Flashcards

1
Q

Where is visible enamel?

A

crown of tooth= “clinical” crown

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2
Q

what is enamel?

A

White, hard that covers outside of tooth

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3
Q

what is the anatomical crown?

A

part of tooth completely covered in enamel

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4
Q

what are enamel features?

A

brittle

rely on dentine for strength

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5
Q

what happens to enamel with age?

A

thinner so more yellow dentine shows through more

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6
Q

what is the pure organic mineral in enamel?

A

Hydroxyapatite

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7
Q

what is organic material in enamel?

A

non collagenous proteins

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8
Q

where is enamel most thick?

A

incisal edge

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9
Q

What is spot process of caries?

A

white opaque spot> brown lesion stain> cavity

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10
Q

what does wedge shape cavity mean?

A

lesion reached dentine

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11
Q

why does lesion initially appear white?

A

sub surface enamel is porous

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12
Q

what is amelogenesis imperfecta?

A

enamel affected by genetic defects

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13
Q

what is HAP?

A

Ca10(P04)6(OH)2

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14
Q

How are HAP crystals arranged?

A

Prisms- from dentine to below tooth surface

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15
Q

how are prisms arranged in cross sec?

A

perpendicular to ADJ

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16
Q

What do prism have?

A

circadian rhythm for daily cross striations

17
Q

what are imposed on daily cross striations of enamel?

A

Brown Striae of Retzius

18
Q

What direction to prisms run from?

A

right to left

19
Q

What is prism arrangement of Rat incisor ?

A

prism different to neighbour

20
Q

What is prism arrangement in human enamel?

A

1) 2 groups run Longitudinal

2) Transverse- prism give key hole shape

21
Q

What is type 1 enamel?

A

prisms= circular/hexagonal

22
Q

what is type 3 enamel?

A

continuum between prisms and interprismatic enamel in row below so key hole shape

23
Q

What is enamel structure at ADJ?

A

Tufts
spindles
lamellae

24
Q

What is enamel structure not at ADJ?

A

hunter Schreger bands
gnarled enamel
perikymata
aprismatic enamel

25
Q

What do lamallea run through?

A

whole thickness of enamel

26
Q

What do tufts protrude for?

A

1/3 of thickness of enamel

27
Q

How do prisms travel towards ADJ?

A

parallel to each other in S sinusoidal path

28
Q

How do prisms travel in longitudinal section?

A

inner 2/3 in hunter Schreger bands

outer 1/3 parallel so aprismatic

29
Q

What are enamel spindles?

A

at ADJ- when odontoblasts elongate into enamel and leave a void

30
Q

What can spindles do?

A

weaken ADJ

31
Q

Where do striae of retzius run?

A

obliquely across prism and on boarders of crown surface

32
Q

What is perikymata

A

small depressions running around tooth

33
Q

why can striae look like tree rings?

A

continuous around cusps

HISTOLOGY (5 decks)

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