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Oral Biology > Dentine > Flashcards

Dentine Flashcards

1
Q

What is the direction of collagen fibres in dentine?

A

mainly parallel to ADJ

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2
Q

What is the role of collagen fibres in dentine?

A

strength

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3
Q

What are tubules produced by?

A

odontoblasts

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4
Q

What lines the edge of pulp?

A

odontoblasts

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5
Q

Why is deep dentine wetter and more porous?

A

It contains more tubules that contain fluid

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6
Q

What is the first type of dentine formed?

A

developmental mantle dentine

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7
Q

What makes up the developmental dentine?

A

mantle and curcumpulpal dentine

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8
Q

In mantle dentine, what direction do the collagen fibrils run?

A

90 degrees to the ADJ

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9
Q

In circumpulpal dentine, what direction do the collagen fibrils run?

A

parallel to the ADJ

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10
Q

What are the 2 types of tertiary dentine?

A

Reactionary and reparative

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11
Q

What type of stimulus provokes reactionary dentine to form?

A

mild caries

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12
Q

What type of cells are used in reactionary tertiary dentine?

A

existing odontoblasts

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13
Q

What structure does reactionary tertiary dentine have?

A

tubular structure

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14
Q

What stimulus provokes reparative tertiary dentine?

A

strong caries

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15
Q

What happens in reparative dentine formation?

A
  • existing odontoblasts are destroyed
  • newly differentiated odontoblasts are recruited
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16
Q

What type of tertiary dentine formation is faster?

A

reparative

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17
Q

Is the structure of reparative tertiary dentine strong or weak?

A

weak

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18
Q

What is peritubular dentine?

A

around tubules and highly mineralised - tubular diameter is smaller in teeth of older people

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19
Q

What is intratubular dentine?

A

dentine between tubules

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20
Q

What are incremental lines of Von Ebner?

A

the position of odontoblasts at different times during development

21
Q

What coincides with dentine secondary curvatures?

A

contour line of owen

22
Q

When does sclerosis occur?

A

in respond to insult

23
Q

What happens in sclerosis?

A

Tubules blocked off and filled with mineralised deposit (transparent)

24
Q

What does sclerosis prevent?

A

bacteria travelling down to the pulp, slows down advance of caries

25
Q

What appears in dentine on VM in response to insult when odontoblasts die?

A

dead tracts

26
Q

Why do dead tracts occur?

A

odontoblasts die so empty tubules are sealed with reparative tertiary dentine

27
Q

What can be seen with age in dentine?

A

sclerosis

28
Q

What are the 2 causes of sclerosis?

A

insult and age

29
Q

With age, where does sclerosis appear?

A

starts at the apex

30
Q

What makes sclerotic dentine at risk to root fracture?

A

less flexible root as filled with more tubular dentine

31
Q

What are 2 dentine defence responses?

A
  • reactionary tertiary dentine
  • translucent/ sclerotic zone
32
Q

What happens if there is rapid progression of caries?

A
  • no sclerosis
  • odontoblasts die
  • reparative tertiary dentine
33
Q

What are the 5 zones of established dentine caries?

A
  1. reactionary tertiary dentine
  2. translucent/ sclerotic zone
  3. advancing front
  4. zone of bacterial penetration
  5. zone of destruction
34
Q

what is the advancing front?

A

zone of demineralisation - acid demineralisation, no bacteria

35
Q

what is the zone of bacterial penetration?

A

bacteria invade tubules and spread laterally via branched tubules
- lactobacilli
- still has collagen structure

36
Q

what is the zone of destruction?

A

bacterial population becomes mixed and together with proteolytic enzymes, destroys the organic matrix (lose structure)

37
Q

What zone of dentine caries is irreversible when infected?

A

outer, superficial zone

38
Q

What zone of dentine caries has a degradated collagen matrix?

A

outer, superficial zone

39
Q

Why is fissure caries hard to diagnose?

A

the fissure remans intact whilst inside is rotten

40
Q

What appears when dentine is cut?

A

smear layer

41
Q

What does the smear layer contain?

A
  • dentine
  • debris
  • saliva
  • tubular fluid
42
Q

What is used to dissolve the smear layer and expose dentinal tubules?

A

acid conditioning

43
Q

What does acid conditioning do?

A
  • dissolves smear layer
  • demineralises hard tissue on surface layer of dentine
44
Q

What is exposed when smear layer is removed?

A

collagen network

45
Q

What are resins and solvents used for?

A

penetrate aqueous collagen layer which allows resin to penetrate tubules and soak into collagen network, set and lock in.

46
Q

What happens if you over etch dentine?

A

the collagen layer will collapse and reduce bond strengths

47
Q

What bond strength does the smear layer have?

A

low bond strength

48
Q

What happens if you over etch dentine?

A

the collagen layer will collapse = hybrid layer

Oral Biology (4 decks)

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