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BDS2 Oral Biology - Histology > (4) Dentino-pulpal Complex - Structural Lines > Flashcards

(4) Dentino-pulpal Complex - Structural Lines Flashcards

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1
Q

What are the lines associated with the primary curvature of dental tubules called?

A

Schreger lines

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2
Q

What are the lines associated with the secondary curvatures of dental uvulae’s called?

A

Contour lines of Owen

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3
Q

What are daily incremental lines called?

A

Von Ebner’s lines

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4
Q

What are the weekly incremental lines called?

A

Anderesen lines

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5
Q

Where is the most dramatic secondary curvature line?

A

Between the primary and secondary dentin

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6
Q

What contour line is pointed to?

A

Secondary curvature line

Contour lines of Owen

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7
Q

How do the Von Ebner’s lines show?

A

Short term striations

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8
Q

How do the Andresen lines appear?

A

Long term striations

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9
Q

What gives rise to the incremental lines?

A

Fluctuations in acid-base balance

Effect on mineral content and thus the refractive index

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10
Q

What incremental lines are shown?

A

Von Ebner’s lines

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11
Q

Where are the Von Ebner’s lines closest together and farthest apart?

A

Closest (2um between every 2 lines) at the root

Farther away (4um between every 2 lines) at the cusp

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12
Q

Why are the Von Ebner’s lines closer together in the root?

A

Not as much dentin is formed in the root each day

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13
Q

What is pointed to and what do they run over?

A

Von Ebner’s lines, run over dentinal tubules

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14
Q

What incremental lines are shown?

A

Andresen lines

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15
Q

How far apart are Andresen lines?

A

16-20um

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16
Q

Name structures and what type of section

A

A = enamel
B = circumpulpal dentine
C = mantle dentin

Black arrows = stria of Ritzius

White arrows = andresen lines

Ground section

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17
Q

What line is shown in this image?

A

Neonatal line

Shows what was formed before and after birth

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18
Q

What are physiological age related changes associated with dentin?

A

Secondary dentin
Translucent dentin

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19
Q

What are age related changes associated with dentin, associated with response to stimuli?

A

Tertiary dentin
Sclerotic dentin
Dead tracts f fish

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20
Q

When does secondary dentin form?

A

Starts to form once the root is completed and teh tooth come into occlusion

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21
Q

What happens to the direction of the dentinal tubules in secondary dentin?

A

Sudden change in direction

22
Q

Do the secondary or primary dentin have closer incremental lines?

A

Secondary

23
Q

What has slower deposition, primary or secondary dentin?

A

Secondary, thus less regular

24
Q
A

Contour line of Owen

25
Q

What causes tertiary dentin to form?

A

External stimuli might induce the pulp t produce more calcified material

26
Q

What structure produces tertiary dentine?

A

Pulp produce more calcified material

27
Q

Where does the tertiary dentine form?

A

Border of the pulp

28
Q

When does tertiary dentin form irregularly vs regularly?

A

When a strong stimulus occurs, dentin needs to form quickly = irregular

29
Q

What is reparative dentine?

A

Newly formed cells, produce hard tissues similar to dentin

30
Q

What is reactionary dentin?

A

More dentin formed by the original odontoblasts

31
Q

What is the appearance of tertiary dentin?

A

Variable

May be… tubular, contain few irregular tubules or tubular

32
Q
A

A = tertiary dentin
B = pre-dentin
C = odontoblasts

33
Q

What cells make tertiary dentine?

A

Odontoblasts

34
Q

What type of tertiary dentin is formed by original odontoblasts?

A

Reactionary dentin

35
Q

What type of stimulus makes reactionary dentin?

A

Small stimulus

36
Q

What type of tertiary dentin is formed when the stimulus is very string? (Kills original odontoblasts)

A

Stem cells in pulp differentiate into odontoblast-like cells and produce reparative dentin

37
Q

What cells form reparative dentin?

A

Odontoblast- like cells (from stem cells)

38
Q

When’d ones sclerotic dentin form?

A

The stimulus induce the deposition of material inside tubules

39
Q

What occludes the tubules to form sclerotic dentin?

A

The Stimulus

40
Q

What is sclerotic dentin similar to and what is the difference?

A

Similar to transparent dentin

However, sclerotic dentin is in response to stimulus and not physiological

41
Q

When can you normally see sclerotic dentin?

A

Under slowly progressing caries lesions

42
Q
A

A = enamel
B = fissure
C = mantle dentin

43
Q
A

Sclerotic dentin

44
Q

What occludes sclerotic dentin?

A

Intratubular dentine

And precipitation of minerals from dissolved enamel

45
Q

What happens when primary odontoblasts are killed by external stimuli? (Before filled with sclerotic dentin)

A

Dead tracts of fish

46
Q

What are dead tracts of fish?

A

Empty tubules

47
Q

What colour will empty tubules appear?

A

Black

48
Q

What might seal the dead tracts of fish at the pulpal end?

A

Tertiary dentin

49
Q

What is shown in black ?

A

Dead tracts of fish

50
Q

What do odontoblast do at the pulpal end of the dead tracts of fish?

A

Occlude the dentine and tubules by sclerotic dentine formation to protect the pulp from insult coming from various lesion

BDS2 Oral Biology - Histology (27 decks)

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