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Oral Histology > Cementum > Flashcards

Cementum Flashcards

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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
True or false. Thickness of cementum increase with age.
True
26
Type of cementum: Contains cementocytes and intrinsic collagen fibers?
Cellular intrinsic fibers
27
Type of cementum formed only during reparative process?
Cellular intrinsic fiber cementum
28
Noncellular amorphous layer of cementum?
Intermediate cementum
29
First layer of cementum deposited?
Intermediate cementum
30
Intermediate cementum contains ____ instead of collagen.
Enamelin
31
True or false. Intermediate cementum has harder consistency than dentin.
True
32
Thin clear zone between granular layer and primary cementum?
Hyaline layer of Hopewell-Smith
33
Type of cementum laid down during root formation?
Acellular cementum
34
Type of cementum laid down after eruption and throughout life?
Cellular cementum
35
Cementum becomes about 3 times thicker between __ and __ yrs of age.
11 and 76
36
Sharpey's fibers are formed by the?
Fibroblast of periodontal ligament
37
Describe the direction of sharpeys fibers.
Perpendicular to cementum
38
Affects the direction of the extrinsic fibers? (2)
* Mesial migration * Tipping
39
Intrinsic fibers are formed by the?
Cementoblasts
40
Describe the direction of intrinsic fibers of cementum?
Parallel to cementum
41
Growth lines of cementum?
Incremental lines of Salter
42
Ground substance of cementum is composed of? (3)
* Proteoglycans * Glycoproteins * Phosphoproteins
43
Cells lining the root surface?
Cementoblasts
44
Type of cementoblasts?(2)
* Active cemetoblast * Resting cementoblasts
45
Cementoblasts that are trapped in the lacunae?
Cementocytes
46
Where do you expect the canaliculi positioned?
Towards the PDL for nutrients
47
Types of cementoenamel junction? (3)
* Overlapping * Butt joint * Gapped
48
CEJ type which occurs 60% of the time?
Overlapping
49
Type of CEJ: When cementum meets enamel forming a distinct CEJ?
Butt joint (30%)
50
Type of CEJ: Where root dentin is exposed?
Gapped (10%)
51
Determines the size and shape of roots?
HERS
52
Induces root dentin formation?
HERS
53
Side note: presence of root dentin --\> HERS break --\> cells of dental follicle come in contact with dentin --\>
Multipotential cells differentiate into cementoblasts :)
54
Uncalcified cementum?
Cementoid or precementum
55
What cells make the ground substance and intrinsic fibers of cementum?
Cementoblasts
56
True or false. Acellular cementum is laid down more slowly.
True
57
True or false. Root is easier to extract if cementum is fused.
True
58
Excessive amount of cementum?
Hypercementosis
59
Hypercementosis is caused by overproduction of what type of cementum?
Cellular cementum
60
Overgrowth of cementum found in functional teeth?
Cementum hypertrophy
61
Overgrowth of cementum found in non functioning tooth?
Cementum hyperplasia
62
Increased in physiologic function as seen in abutment teeth?
Cementum hypertrophy
63
Causes of cementum hyperplasia? (3)
* Impacted tooth * Natural or orthodontically induced movements * Supraeruption
64
Part of periodontal ligament which is a remnant of HERS?
Epithelial rests of Malassez
65
Localized cemental thickening on the root surface?
Enamel pearl
66
Another term for enamel pearl?
Enamelloma
67
Mimics subgingival calcular deposits?
Enamel pearls
68
Sidenote: Enamel pearls may be composed of:
* Enamel only * Enamel and dentin * Enamel, dentin and pulp
69
True or false. When there is calculus, no PDL is attached to enamel.
True
70
Enamel drips at the center of bifurcations or trifurcations?
Enamel projections
71
May lead to pockets in furcations?
Enamel projections
72
True or false. Enamel pearls and projections can be removed through scaling?
False
73
Cementicles are made up of what type of cementum?
Acellular extrinsic fiber ## Footnote *May be free, attached or embedded*
74
True or false. Both bone and cementum has no nerve supply.
True
75
Union of cementum and dentin with the alveolar bone?
Ankylosis
76
True or false. Cementum is avascular?
True
77
True or false. Alveolar bone is avascular.
False
87
Resorption of cementum can be due to? (4)
Exfoliation of deciduous teeth Tooth drifting Traumatic occlusion Excessive orthodontic forces

Oral Histology (11 decks)

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