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Oral Histology > 7 Dentin > Flashcards

7 Dentin Flashcards

1
Q
  1. Identify.
A
  1. Enamel
  2. Dentin
  3. Pulp chamber
  4. Root canal
  5. Cementum
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2
Q
  1. Identify.
A
  1. Tomes’ granular layer (common location)
  2. Interglobular dentin (common location)
  3. Odontoblastic process (in dentinal tubule)
  4. Reparative (tertiary) dentin
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3
Q
  1. Identify lightly stained dentin layer in crown A and in root B.
A

A. mantle dentin
B. mantle dentin

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4
Q
  1. Identify light layer marked A.
A

predentin (unmineralized)

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5
Q
  1. Identify structure at black arrow.
A

odontoblastic process (shrunk)

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6
Q
  1. Identify dark spot marked by arrow.
A

odontoblastic process

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7
Q
  1. Identify marked irregular hypomineralized sites in the crown.
A

interglobular dentin

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8
Q
  1. Identify hypomineralized, minute layer at periphery of root dentin (blue arrows).
A

Tomes’ granular layer

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9
Q
  1. Identify marked sites.
A

A. dead tracts
B. sclerotic dentin

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10
Q
  1. Identify marked sites.
A

A. Dead tracts.
B. Reparative or tertiary dentin.

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11
Q
  1. Identify.
A
  1. Tomes’ granular layer
  2. interglobular dentin
  3. reparative (tertiary) dentin
  4. dead tracts
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12
Q
  1. Identify.
A
  1. Tomes’ granular layer
  2. interglobular dentin
  3. reparative dentin
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13
Q
  1. Identify.
A

odontoblastic process
odontoblastic cell body (nucleus site)

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14
Q
  1. Identify.
A

Odontoblastic process in dentinal tubule

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15
Q
  1. Identify.
A

Odontoblastic process

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16
Q
  1. Identify.
A

Odontoblastic process
Peritubular/Intratubuler dentin

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17
Q
  1. Identify.
A

Predentin (unmineralized dentin)
Odontoblastic cell bodies (odontoblastic layer)

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18
Q
  1. Identify.
A

Predentin.
Cell process, cell body.

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19
Q
  1. Identify.
A 
Mantle dentin (crown).
Mantle dentin (root).
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20
Q
  1. Identify.
A

Interglobular dentin.

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21
Q
  1. Identify.
A

Globular dentin.

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22
Q
  1. Identify.
A

Tomes’ granular layer.

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23
Q
  1. Identify.
A

Reparative (tertiary) dentin.
Dead tracts.

24
Q
  1. Identify.
A

Dead tracts.
Reparative dentin.

25
Q
  1. Identify.
A

Reparative (tertiary) dentin.

26
Q
  1. Identify.
A

Predentin (unmineralized).

27
Q
  1. Identify.
A

Tomes’ granular layer.

28
Q
  1. Identify.
A

Cell body of odontoblast.
Cell process of odontoblast.
Top: dentinal tubule (empty)
Bottom: odontoblastic process (shrunk)

29
Q
  1. Identify.
A

Globular dentin.
Tomes’ granular layer.
Interglobular dentin.
Reparative dentin.

30
Q
  1. Identify.
A

Reparative dentin.

31
Q

Which of the following areas of dentin are hypomineralized? (More than one correct answer).

A. Peritubular (intratubular) dentin
B. Interglobular dentin
C. Tomes’ granular dentin
D. Predentin

A

A. No, this is hypermineralized. It’s the hardest part of dentin and forms the wall of the dentinal tubule.
B. Yes, found along the outer surface of crown dentin.
C. Yes, found at the periphery of root dentin.
D. No, unmineralized.

32
Q
  1. Click on the spot that indicated peritubular or intratubular dentin.
A

Top: Yes, it’s peritubular dentin; the hardest area of dentin.
Bottom: No, intertubular dentin; the major mass of dentin.

33
Q
  1. Which numbered arrow is indicating interglobular dentin?
A
  1. Yes. This is the hypomineralized interglobular area surrounded by mineralized globular dentin. 2. No. This is normally mineralized globular dentin.
34
Q
  1. Identify.
A

Dentopulpal junction
Odontoblast cell body
Odontoblastic cell process

35
Q

T/F: Cell bodies (nucleus site) of odontoblast lie at the periphery of the the pulp in the predentin layer.

A

True. The pulp and dentin share the odontoblast. The cell body is in the pulp and its cell process is in the dentin.

36
Q

What percentage of dentin is composed of inorganic substance? A. 96% B. 10% C. 30% D. 70%

A

D. Inorganic substance (hydroxyapatite). 20% organic substance, 10% water

37
Q

Which of the following are located within the dentinal tubule?

A

D. It has a cell process of an odontoblast and tissue fluid that is supplied by blood vessels of pulp tissue.

38
Q

The cell bodies are found at which of the following sites?

A. predentin
B. dentinal tubules
C. mantle layer
D. pulp cavity

A

D. Odontoblastic cell bodies are located at the periphery of the pulp cavity along the surface of the predentin.

39
Q

The outer hypomineralized layer of dentin is which of the following?

A. Predentin
B. Tomes’ granular layer
C. Interglobular dentin
D. Mantle dentin

A

D. Hypomineralized outer dentin layer in the crown and the root.

40
Q

What percentage of dentin is organic substance?

A

20%

41
Q

Tomes’ granular layer is found in what specific area of a tooth?

A. crown dentin
B. pulp
C. root dentin
D. cementum

A

C. It is found at the periphery of root dentin near the cementodental junction (CDJ)

42
Q

All of the following are found in dentin except?

A. cell processes
B. collagen fibrils
C. hydroxyapatite crystals
D. whole cells

A

D, whole cells are the exception. Dentin does not have whole cells within its volume. However, it does contain cell processes within its dentinal tubules. These are processes of odontoblast. Nuclei of odontoblasts are located at the periphery of pulp.

43
Q

All of the following sites are hypomineralized except which one?

A. interglobular dentin
B. Tomes’ granular process
C. Predentin
D. mantle dentin layer

A

C. It is unmineralized layer of dentin matrix adjacent to the pulp cavity. It mineralizes as a new predentin layer is forming.

44
Q

The hardest or hypermineralized site in dentin is which of the following?

A. intertubular dentin
B. predentin
C. mantle dentin
D. peritubular (intratubular) dentin

A

D. Hardest part of dentin, forms the wall of the dentinal tubule.

45
Q

What is the area of dentin called where the dentinal tubules are filled with mineral salts (obliterated)?

A. dead tract
B. reparative dentin
C. secondary dentin
D. sclerotic dentin

A

A. No, this is an area of dentin where the dentinal tubules are empty or filled with air, not mineral salts.
D. This type of dentin is also called transparent dentin because you can see through it.

46
Q

T/F: Tomes’ granular layer is located in both crown and root dentin and consists of minute hypermineralized areas.

A

False, It is located only in root dentin near the CDJ and consists of minute hypo- not hypermineralized areas.

47
Q

T/F: Interglobular dentin is lcoated at the periphery of the root dentin and consists of isolated hypermineralized irregularities.

A

False. Interglobular dentin is located at the periphery of crown dentin not root dentin and is an area of hypo- not hyper-mineralized irregularities.

48
Q

What is the area of dentin called where the dentinal tubules are empty or filled with air?

A. secondary dentin
B. scleratic dentin
C. reparative dentin
D. dead tract

A

D. It’s an area of dentin where the dentinal tubules are empty because the odontoblastic processes withdraw toward the pulp due to external stimuli or aging.

49
Q
  1. Which cell image best represents the shape of an odontoblast?
A

C. An odonotoblast has a cell body and a long cytoplasmic process. The cell body is located within the pulp and the cell process is int he dentinal tubule.

50
Q
  1. Which is common location of interglobular dentin?
A

2. Common location of interglobular dentin.

51
Q
  1. Label globular and interglobular.
A

Top/right: interglobular
Bottom/left: globular

52
Q
  1. Identify reparative dentin.
A

L: dead tract
R: reparative/tertiary dentin.

53
Q
  1. Identify.
A

Mineralized dentin
Predentin
Odontoblastic layer

54
Q

Which of the following cells secrete extracellular substance of a tooth?

A. odontoblast
B. ameloblast
C. cementoblast
D. fibroblast

A

A. Secretes the organic or extracellualr substance of dentin tissue.

55
Q
  1. Identify unmineralized predentin layer.
A

Top/right: unmineralized predentin layer that is secreted by the odontoblast.

Oral Histology (9 decks)

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