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Oral Histology > Cementum > Flashcards

Cementum Flashcards

0
Q

True or false. Cementum is thicker in the cervical area.

A

False. Thicker in apical root

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1
Q

Dental tissue that is both component of tooth and periodontium?

A

Cementum

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2
Q

True or false. Bone is more mineralized than cementum?

A

True

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3
Q

Color of cementum?

A

Light yellow

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4
Q

True or false. Cementum has no luster?

A

True

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5
Q

Causes of cementum exposure? (2)

A
  • Gingival recession
  • Supraeruption
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6
Q

% of inorganic component of cementum?

A

45-50%

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7
Q

Components of organic matrix of cementum? (3)

A
  • Collagen
  • Chondroitin sulfate
  • Water
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8
Q

True or false. Enamel contains collagen?

A

False

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9
Q

Describe the resorbed surface of cementum.

A

Scalloped

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10
Q

True or false. Alveolar bone is more easily resorbed than cementum.

A

True

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12
Q

Type of repair in cementum:

a. Where lacunae is partially filled?
b. When completely filled?

A

Functional repair

Anatomical repair

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13
Q

Type of cementum repair where physiologic width of periodontal space is reestablished?

A

Functional repair

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14
Q

Type of cementum repair where continuity of root surface is reestablished?

A

Anatomical repair

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15
Q

Type of cementum:

Contains neither cementocytes nor collagen fibers?

A

Acellular afibrillar cementum

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16
Q

Other term for acellular afibrillar cementum?

A

Coronal cementum

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17
Q

Extrinsic collagen fibers?

A

Sharpey’s fibers

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18
Q

Type of cementum:

Consisting of sharpeys fibers?

A

Acellular extrinsic fiber cementum

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19
Q

Other terms for acellular extrinsic fiber cementum?

A
  • Primary cementum
  • Fibrous cementum
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20
Q

What part of root where acellular maybe mixed with cellular cementum?

A

Middle 1/3 of root

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21
Q

Type of cementum:

Contains extrinsic and intrinsic collagen fibers?

A

Cellular mixed fiber cementum

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22
Q

Another term for cellular mixed fiber cementum?

A

Secondary cementum

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23
Q

Type of cementum formed facing furcations?

A

Cellular mixed fiber or secondary cementum

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24
Q

True or false. Secondary cementum formation is a continuous process.

A

True

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25
Q

True or false. Thickness of cementum increase with age.

A

True

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26
Q

Type of cementum:

Contains cementocytes and intrinsic collagen fibers?

A

Cellular intrinsic fibers

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27
Q

Type of cementum formed only during reparative process?

A

Cellular intrinsic fiber cementum

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28
Q

Noncellular amorphous layer of cementum?

A

Intermediate cementum

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29
Q

First layer of cementum deposited?

A

Intermediate cementum

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30
Q

Intermediate cementum contains ____ instead of collagen.

A

Enamelin

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31
Q

True or false. Intermediate cementum has harder consistency than dentin.

A

True

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32
Q

Thin clear zone between granular layer and primary cementum?

A

Hyaline layer of Hopewell-Smith

33
Q

Type of cementum laid down during root formation?

A

Acellular cementum

34
Q

Type of cementum laid down after eruption and throughout life?

A

Cellular cementum

35
Q

Cementum becomes about 3 times thicker between __ and __ yrs of age.

36
Q

Sharpey’s fibers are formed by the?

A

Fibroblast of periodontal ligament

37
Q

Describe the direction of sharpeys fibers.

A

Perpendicular to cementum

38
Q

Affects the direction of the extrinsic fibers? (2)

A
  • Mesial migration
  • Tipping
39
Q

Intrinsic fibers are formed by the?

A

Cementoblasts

40
Q

Describe the direction of intrinsic fibers of cementum?

A

Parallel to cementum

41
Q

Growth lines of cementum?

A

Incremental lines of Salter

42
Q

Ground substance of cementum is composed of? (3)

A
  • Proteoglycans
  • Glycoproteins
  • Phosphoproteins
43
Q

Cells lining the root surface?

A

Cementoblasts

44
Q

Type of cementoblasts?(2)

A
  • Active cemetoblast
  • Resting cementoblasts
45
Q

Cementoblasts that are trapped in the lacunae?

A

Cementocytes

46
Q

Where do you expect the canaliculi positioned?

A

Towards the PDL for nutrients

47
Q

Types of cementoenamel junction? (3)

A
  • Overlapping
  • Butt joint
  • Gapped
48
Q

CEJ type which occurs 60% of the time?

A

Overlapping

49
Q

Type of CEJ:

When cementum meets enamel forming a distinct CEJ?

A

Butt joint (30%)

50
Q

Type of CEJ:

Where root dentin is exposed?

A

Gapped (10%)

51
Q

Determines the size and shape of roots?

52
Q

Induces root dentin formation?

53
Q

Side note: presence of root dentin –> HERS break –> cells of dental follicle come in contact with dentin –>

A

Multipotential cells differentiate into cementoblasts :)

54
Q

Uncalcified cementum?

A

Cementoid or precementum

55
Q

What cells make the ground substance and intrinsic fibers of cementum?

A

Cementoblasts

56
Q

True or false. Acellular cementum is laid down more slowly.

57
Q

True or false. Root is easier to extract if cementum is fused.

58
Q

Excessive amount of cementum?

A

Hypercementosis

59
Q

Hypercementosis is caused by overproduction of what type of cementum?

A

Cellular cementum

60
Q

Overgrowth of cementum found in functional teeth?

A

Cementum hypertrophy

61
Q

Overgrowth of cementum found in non functioning tooth?

A

Cementum hyperplasia

62
Q

Increased in physiologic function as seen in abutment teeth?

A

Cementum hypertrophy

63
Q

Causes of cementum hyperplasia? (3)

A
  • Impacted tooth
  • Natural or orthodontically induced movements
  • Supraeruption
64
Q

Part of periodontal ligament which is a remnant of HERS?

A

Epithelial rests of Malassez

65
Q

Localized cemental thickening on the root surface?

A

Enamel pearl

66
Q

Another term for enamel pearl?

A

Enamelloma

67
Q

Mimics subgingival calcular deposits?

A

Enamel pearls

68
Q

Sidenote: Enamel pearls may be composed of:

A
  • Enamel only
  • Enamel and dentin
  • Enamel, dentin and pulp
69
Q

True or false. When there is calculus, no PDL is attached to enamel.

70
Q

Enamel drips at the center of bifurcations or trifurcations?

A

Enamel projections

71
Q

May lead to pockets in furcations?

A

Enamel projections

72
Q

True or false. Enamel pearls and projections can be removed through scaling?

73
Q

Cementicles are made up of what type of cementum?

A

Acellular extrinsic fiber

May be free, attached or embedded

74
Q

True or false. Both bone and cementum has no nerve supply.

75
Q

Union of cementum and dentin with the alveolar bone?

76
Q

True or false. Cementum is avascular?

77
Q

True or false. Alveolar bone is avascular.

87
Q

Resorption of cementum can be due to? (4)

A

Exfoliation of deciduous teeth Tooth drifting Traumatic occlusion Excessive orthodontic forces

Oral Histology (11 decks)

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