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BDS2 Oral Biology - Histology > (4) Dentinal-pulpal complex - dentine variations in structure > Flashcards

(4) Dentinal-pulpal complex - dentine variations in structure Flashcards

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1
Q

What is the first layer of dentin to form and the most peripheral?

A

Mantle dentin

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2
Q

what are the 7 structures in dentin?

A
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3
Q

What is the width of mantle dentine?

A

20-150um

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4
Q

what direction does dentin form?

A

Inwards

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5
Q

does mantle dentin form throughout life?

A

Yes

Towards the pulp

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6
Q

what is mantle dentin adjacent to?

A

Enamel

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7
Q

what is the circumpulpal dentin?

A

All the dentin form the mantle dentin

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8
Q

what is the most mineralised part of dentin?

A

The circumpulpal dentin

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9
Q

What is more mineralised; mantle or circumpulpal dentine?

A

Circumpulpal dentine by 5%

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10
Q

what is the direction of the collagen fibres in the mantle dentin?

A

Perpendicular on the amelo-dentinal junction

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11
Q

Does the mantle dentin have a lot of looping of tubules?

A

Yes

Because of the branching of the odontoblastic processes at the beginning of the dentine formation

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12
Q

How is mantle dentin mineralised?

A

Through small vesicles with crystals inside them

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13
Q

what type of section is this?

A

Ground section

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14
Q
A
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15
Q
A

A = enamel
B = mantle dentin
C = circumpulpal dentine (primary curvature)

Arrows = interglobular dentin

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16
Q

what is interglobular dentin?

A

Area which is hypomineralised and jut under the mantle dentin

Minerals deposited as globules (calcospheres)

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17
Q

how does mineralisation occur in dentin?

A

globules which fuse together

Fuse to form a uniform calcified tissue

18
Q

When does interglobular dentin form?

A

If globules fail to fuse together to form dentin

19
Q

How does interglobular dentin compare to the rest of the dentin with regard to mineralisation?

A

just like normal dentin but is not as highly mineralised as threat of the dentin

20
Q

What passes through the interglobular dentin?

A

Tubules

21
Q

why do the interglobular dentin appear dark in a section?

A

The light passes through them

22
Q
A

Interglobular dentin

23
Q

Where is there lots f branching of the dentinal tubules and what occurs?

A

In the roots

So much branching creates loops

24
Q

What happens when loops are formed in the roots? (Section)

A

Air gets trapped in ground sections and reflect the light and they appear dark

25
Q

What are the dentinal tubule loops called in the roots?

A

Granular layer of Tome

26
Q

Is the granular layer of Tomes hyper or hypomineralised?

A

hypomineralised

27
Q
A

A = acellular cementum
B = granular layer of tomes
C = cementum (granular layer of Tomes)

28
Q
A

A = dentin
B = granular layer of tomes
C = hyaline layer
D = acellular cementum

29
Q

What is the width of the hyaline layer?

A

Up to 20um

30
Q

Where do you find the hyaline layer in the tooth?

A

The root

The crown has mantle dentin

31
Q

What is the role of the hyaline later?

A

Helps bonding dentin to cementum

32
Q

what does the hyaline layer lie outside of?

A

Granular layer of tomes

33
Q

What is the structure of circumpulpal dentin?

A

Uniform in structure except at peripherals

34
Q

What is predentine?

A

initially laid dentin matrix prior to mineralisation

35
Q

how does mineralisation of predentin occur in predentin?

A

In globules or a linear appearance

36
Q

What is the width of predentine?

A

10-40um in width

37
Q

is predentine thicker in young or older teeth?

A

Younger

38
Q
A
39
Q

What does the predentin always lie next to?

A

The pulp

40
Q

What is mantle dentin always net to?

A

The enamel

41
Q

What is the mineralisation front?

A

The interface between the fully mineralised dentin and newly formed dentin

BDS2 Oral Biology - Histology (27 decks)

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