Brainscape's Knowledge GenomeTM

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


See full index

Oral Histology > Dentin > Flashcards

Dentin Flashcards

0
Q

Characterized as positively birefringent?

A

Dentin

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

Color of dentin?

A

Yellow intrinsic color

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

Organic material of dentin? (3)

A
  • Collagen
  • Ground substance
  • Water
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

Types of dentin. (4)

A
  • Primary
  • Secondary
  • Tertiary
  • Predentin/dentinoid
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

Also known as orthodentin or regular dentin?

A

Primary dentin

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

Other terms of tertiary dentin?

A
  • Reactive
  • Reparative
  • Irregular secondary dentin
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

Primary dentin is developed before or after tooth eruption?

A

Before tooth eruption

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

It has regularly arranged dentinal tubules?

A

Primary dentin

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

Peripheral layer of dentin found adjacent to the enamel in the crown and cementum in the roots?

A

Mantle dentin

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

Layer of dentin containing collagen alpha fibrils?

A

Mantle dentin

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

True or false. Incremental lines can be found in mantle dentin?

A

False

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

Makes up the bulk of dentin?

A

Circumpulpal dentin

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

Dentin consisting of beta fibrils and mucopolysaccharide grounds substance?

A

Circumpulpal dentin

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

Acts as a lubricant or as shock absorber?

A

Mucopolysaccharide

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
30
Q

True or false. Dentin is hydrophilic?

A

True

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
31
Q

Intertubular dentin consist of what type of collagen fibers?

A

Type 1

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
32
Q

Dentinal tubules exhibit ___? shaped curvature.

A

S shaped

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
33
Q

Regularly arranged canals from pulp to DEJ/DCJ

A

Dentinal tubules

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
34
Q

True or false. Dentinal tubules are more pronounced in the incisal and cuspal areas.

A

False

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
35
Q

Why are dentinal tubules few in incisal/cuspal areas?

A

Due to crowding of odontoblasts as more dentin is formed

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
36
Q

True or false. Tubules in root dentin has less S curvature?

A

True

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
37
Q

Types of branching. (2)

A
  • Dichotomous
  • Greater branching
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
38
Q

Contents of dentinal tubules. (3)

A
  • Odontoblastic process
  • Periodontal space
  • Intratubular nerve
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
39
Q

Other term for odontoblastic process?

A

Tome’s fiber or dentinal fiber

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
40
Q

Cytoplasmic extension of odontoblasts?

A

Odontoblastic process

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
41
Q

Found between the odontoblatic process and wall of the tubule?

A

Periodontoblastic space

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
42
Q

Periodontoblastic space contains ____?

A

Dentinal fluid

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
43
Q

Dentinal tubules filled with air?

A

Dead tracts

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
44
Q

Causes of dead tracts? (2)

A
  • Retraction of odontoblastic process
  • Death of odontoblast
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
45
Q

Occurs when dentinal tubules have become occluded with calcified material?

A

Sclerotic dentin

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
46
Q

Glossy appearance of dentin is due to formation of?

A

Sclerotic dentin

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
47
Q

Note: In sclerotic dentin, there is no odontoblastic process..

A

Filled with intratubular dentin instead

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
48
Q

True or false. Sclerotic dentin decrease with age.

A

False. Increases

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
49
Q

Part of tooth where sclerotic dentin is found?

A
  • Apical 1/3 of root
  • Midways between DEJ and pulp
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
50
Q

Globular zones of dentin mineralization?

A

Calcospherites

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
51
Q

Areas of hypomineralized dentin where calcospherites failed to fuse?

A

Interglobular dentin

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
52
Q

Formation of interglobular dentin is due to? (2)

A
  • Vitamin D deficiency
  • Exposure to high levels of fluoride
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
53
Q

True or false. Tubules in interglobular dentin are uninterrupted.

A

True

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
54
Q

True or false. Interglobular dentin is found in circumpulpal dentin.

A

True

55
Q

Black structures located in the root dentin adjacent to cementum?

A

Granular layer of Tome’s

56
Q

True or false. Granular layers of tomes is seen decalcified section?

A

False. Seen only in ground section

57
Q

Incremental lines of dentin?

A

Von Ebner

58
Q

Dentin is mineralized in a __ hour cycle?

A

12

59
Q

Changes in coloration of dentin?

A

Contour lines of Owen

60
Q

It intercepts the DEJ and meet an accompanying Striae of Retzius?

A

Contour lines of Owen

61
Q

Formative organ of dentin?

A

Dental papilla

62
Q

Embryonic origin of dentin?

A

Ectomesenchyme

63
Q

Formation of dentin begins at what stage of tooth development?

A

Late bell stage

64
Q

First sign of dentin formation?

A

Appearance of Von Korff’s fibers

65
Q

Fibrils of odontoblasts?

A

Beta fibrils

66
Q

Composition of predentin? (2)

A
  • Collagen fibers
  • Ground substance
67
Q

Theories of dentin sensitivity? (3)

A
  • Direct conduction
  • Transduction
  • Hydrodynamic theory
68
Q

An unusual feature of dentin-pulp complex?

A

Dentin sensitivity

69
Q

Overwhelming sensation percipeived by dentin-pulp complex?

A

Pain

70
Q

Stimuli of dentin sensitivity comes from? (3)

A
  • Airwater spray
  • Contact with a bur or probe
  • Dehydration
71
Q

Part of tooth where dentin is more sensitive?

A
  • Along the DEJ
  • Near the pulp
72
Q

Theory states that dentin is directly innervated?

A

Direct conduction

73
Q

Downside of direct conduction theory?

A

Not all tubules have nerves

74
Q

Theory states that odontoblasts acts as receptors?

A

Transduction theory

75
Q

Theory that states: Fluid movement stimulates receptors in the pulp

A

Hydrodynamic theory

76
Q

Two treatments for hypersensitivity.

A
  • Interrupt neural response to pain
  • Occlude open tubules
77
Q

Disturbance of dentin mineralization causes?

A

Dentinogenesis imperfecta

78
Q

Dentinogenesis imperfecta is characterized by? (3)

A
  • Abnormally translucent enamel
  • Bulbous crown with short root
  • Obliteration of the pulp
79
Q

Placement of calcium hydroxide liner for deep cavities?

A

Indirect pulp capping

80
Q

True or false. Sclerotic dentin is observed after endodontic therapy.

A

False.

No pulp or odontoblasts, therefore no sclerotic dentin formed

81
Q

Houses the pulpal tissue?

A

Pulp cavity

82
Q

Occupies the coronal pulp?

A

Pulp chamber

83
Q

Occupies the radicular pulp?

A

Root canal

84
Q

Openings of the pulp is called?

A

Orifices

85
Q

Lateral branching of the main root canal?

A

Accessory canal

86
Q

Allows communication between pulp and periodontal ligament?

A

Accessory canal

87
Q

Serves as an avenues for spread of disease from one tissue to another?

A

Accessory canal

88
Q

Where blood vessels and nerves enter and exit the tooth?

A

Apical foramen

89
Q

Describe the apical foramen of newly erupted teeth.

A

Open and should not be extracted

90
Q

True or false. As tooth completes its development, apical foramen becomes more centrally located.

A

False. More eccentric

91
Q

What makes apical foramen more occlusally located than the anatomical apex? (2)

A
  • Deposition of cementum
  • Resorption of dentin
92
Q

Narrowest portion of pulp cavity?

A

Apical constriction

93
Q

Functions of pulp. (5)

A
  • Inductive
  • Formative
  • Sensory
  • Nutritive
  • Defensive
94
Q

Morphotic response of pulp?

A
  • Formation of tertiary dentin
  • Formation of sclerotic dentin
95
Q

Inflammatory response of pulp?

A

Pulpitis

96
Q

Structural components of pulp (4)

A
  • Odontoblastic zone
  • Cell free zone
  • Cell rich zone
  • Pulp proper/pulp core
98
Q

Develops after root formation is completed?

A

Secondary dentin

99
Q

Asymmetric reduction in size and shape of the pulp chamber?

A

Pulp recession

100
Q

True or false. Secondary dentin is deposited slower than primary dentin?

A

True

101
Q

Change in direction which marks the separation of primary and secondary dentin?

A

Schreger’s line

102
Q

Formed in response to noxious stimuli?

A

Tertiary dentin

103
Q

True or false. Tertiary dentin has more dentinal tubules?

A

False. Fewer dentinal tubules

104
Q

True or false. Tertiary dentin is found only on areas needed.

A

True

105
Q

Uncalcified dentin

A

Predentin

106
Q

It lines the innermost portion of dentin

A

Predentin

107
Q

Predentin is calcified within ___ hours?

A

24 hrs

108
Q

Covers the walls of dentinal tubules?

A

Intratubular dentin

109
Q

Another term for intratubular dentin?

A

Peritubular dentin

110
Q

True or false. Peritubular dentin is more mineralized and dense than intertubular dentin.

A

True

111
Q

True or false. Peritubular dentin is continuously formed.

A

True

112
Q

Found between the dentinal tubules?

A

Intertubular dentin

113
Q

It forms the main bulk of dentinal material?

A

Intertubular dentin

Oral Histology (11 decks)

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