Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

BDS2 Oral Biology - Histology > (4) Dentino-pulpal Complex - dentin tubules > Flashcards

(4) Dentino-pulpal Complex - dentin tubules Flashcards

You may prefer our related Brainscape-certified flashcards:
AP® Biology flashcards Biology 101 flashcards
1
Q

What course do the dentin tubules follow?

A

Curved sigmoid course

Primary curvature

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

Name structures A and B

A
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

What type of section is shown here?

A

Cross section

Partial demineralised section

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

Name structures A-C

A
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

What side of the dentin is thicker and which is thinner?

A

The tubules are 2.5μm in diameter at the pulpal end and 1μm or less at the Enamel end.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

Why do the dentin tubules become closer together at the pulpal end?

A

As the odontoblasts retreat inwards, they occupy a smaller area, thus the tubules become closer to each others.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

What cross-sectional area occupies more dentin tubules, enamel-dentin junction or the pulps end?

A

PULPAL END

22% of the cross sectional area near the pulp is occupied by dentinal tubules.
* 2.5% at the enamel-dentine junction.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

What does this image show?

A

Contour lines of Owen

Secondary curvatures, if they coincide in adjacent tubules they give rise to contour lines of Owen (arrowed).

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

Where do dentin tubules branch?

A

near enamel-dentine junction

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

What happens to terminal dentin-tubules branches at the root?

A

They loop

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

What forms the wall of the newly formed dentin tubule at the pulp?

A

Mineralised type 1 collagen

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

What is called intratubular dentin?

A

Maturation of dentin is associated with the deposition of another type of dentin on the walls

Reduction in the size of lumen, sometimes complete obliteration

Maturation Reduces size of lumen

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

What is the role of the organic dentin phospho-proteins?

A

Only present in small amounts

Integral in the mineralisation of dentin

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

What are the structural building blocks of dentin?

A

dentine tubules

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

What is the structure if dentin and its matrix?

A

formed from parallel tubules arranged in a calcified collagen matrix

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

What is the amelodentinal junction

A

The point at which the enamel and dentin meet

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
17
Q
A

A enamel
B dentin
C dentin tubules ( extend to pulp)

18
Q

What is D

A

D is the odontoblastic processes

The processes of the cells which form dentin

19
Q

Where do the most prominent contour line of owen occur?

A

Between primary and secondary dentin

20
Q

Why are the dentine tubules branches?

A

The odontoblastic processes which form them are branched

21
Q

Where do the terminal dentin tubules loop?

A

Root

22
Q

Why is the terminal dentin tubule branches layer called?

A

Granular layer of Tommes

23
Q

Where is the dentine tubules branching found?

A

Dentin and enamel
Or dentin and cementum

24
Q

What is more mineralised intratubular or intertubular dentin?

A

Intratubular, 15% more mineralised/ calcified

25
Q

What does intratubular dentin lack?

A

A collagen matrix

26
Q

What is another name for intratubular dentin?

A

Peritubular dentin

27
Q

What is the aim protein in peritubular dentin?

A

Phosphophoryn

28
Q

What is the main inorganic component of peritubular dentin?

A

Mainly carbonated apatite with a different crystalline structure

29
Q

Peritubular is more mineralised that intertubular dentin, but can it be less calcified?

A

Yes, some areas are hypocalcified

30
Q

What does physiological ageing of root dentin cause?

A

Leads to the complete obliteration of tubules with intratubular dentin

31
Q

What happens if you put an aged tooth in water?

A

Appear translucent when put in water

Can see dots through

32
Q

what is the image showing?

A

Butterfly appearance of the translucent dentin in cross section

33
Q

why does the cross section of the dentin appear butterfly shaped in older age?

A

Due to the convergence of the tubules

Occupy smaller surface area towards the pulp

34
Q

what is found within the dentine tubules?

A

Odontoblastic processes
Afferent nerve terminals
APC processes
Extracellular dentin fluid

Peritubular dentin (lining tubules)

35
Q

what does this image show?

A

Dentine tubule

36
Q

what do you call the dentin which forms first and where is it formed?

A

predentin

Formed at the pulpal surface

37
Q

is pre-dentin mineralised?

A

Yes

38
Q

what is found within the dentin tubule?

A

Odontoblastic process

39
Q

what are the arrows pointing to?

A

Top, dentine tubule
Bottom, odontoblastic process

40
Q

where are the most organelles in the odontoblastc process found and why?

A

Pre-dentin area
Most protein synthesising occurring

41
Q

what organelles are found at the pre-dentine rea?

A

Mitochondria
Protein synthesising organelles

42
Q

where is the odontoblastic process widest and thinnest?

A

widest at the pulpal end and thinner toward the enamel

BDS2 Oral Biology - Histology (27 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2024 Bold Learning Solutions. Terms and Conditions