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Histopathology > Gingival Fiber Ligament & Periodontal Ligament- Exam II > Flashcards

Gingival Fiber Ligament & Periodontal Ligament- Exam II Flashcards

1
Q

GFL:

A

Gingival Fiber Ligament

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2
Q

PDL

A

Periodontal Ligament

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3
Q

The GFL provides ____ and ____ to the marginal gingiva

A

rigidity & density

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4
Q

The GFL acts as the ___for the interproximal crestal alveolar bone

A

periosteum

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5
Q

The GFL provides 1/2 of the ____

A

biological width

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6
Q

The GFL acts as a _____ for the crestal alveolar bone against the spread of ______

A

protective barrier; gingival inflammation

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7
Q

The GFL Inhibits the _____ of the junctional epithelium

A

apical migration

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8
Q

List the GFL fiber groups: (7)

A
  1. dentogingival
  2. dentoperiosteal
  3. alveologingival
  4. circular
  5. transseptal
  6. semicircular
  7. transgingival
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9
Q

The area of junctional epithelium and gingival fiber ligament attached to the root of the tooth:

A

biological width

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10
Q

The biological width extends from more ____ of the junctional epithelium to the _____.

A

coronal attachment; crestal alveolar bone

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11
Q

Violation of the biological width due to placement of overextended restoration margins will result in ____ and if given sufficient time it may induce the loss of supporting _____ with formation of a diseased ______.

A

chronic inflammation; alveolar bone; periodontal pocket

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12
Q

Functions of the PDL include: (5)

A
  1. supportive
  2. regernative
  3. nutritional
  4. sensory
  5. protective
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13
Q

The PDL is derived from ______ cells

A

ectomesenchymal cells (neural crest cells)

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14
Q

The PDL is derived from ectomesenchymal cells (neural crest cells) in the ____ zone of the _____.

A

intermediate zone; dental follical

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15
Q

Cells in the most peripheral zone (outer) of the dental follicle give rise to the _____ . Cells in the most proximal (inner) give rise to ______.

A

alveolar bone proper; cementoblasts

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16
Q

____ are embedded into the cementum of the PDL

A

collagen fibers

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17
Q

consists of small diameter collagen fibers in random orientation that provides support for the principle fiber groups

A

indifferent fiber plexus

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18
Q

Resident cell populations of the PDL include: (7)

A
  1. fibroblasts
  2. osteoblasts
  3. cementoblasts
  4. macrophages
  5. undifferentiated mesenchymal cells
  6. endothelial cells
  7. epithelial cells
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19
Q

PDL fiber groups include: (5)

A
  1. Alveolar crest
  2. Horizontal
  3. Oblique
  4. Apical
  5. Interradicular
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20
Q

PDL fiber group that resists vertical force only:

A

Apical and Alveolar Crest

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21
Q

PDL fiber group that resists vertical and lateral forces:

A

Interradicular

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22
Q

PDL fiber group that resists intrusive forces only:

A

Oblique

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23
Q

PDL fiber group that resists horizontal and tipping force:

A

Horizontal

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24
Q

All PDL fiber groups tend to resist ____ forces

A

rotational

25
Q

GFL fiber group that resists tooth separation:

A

Transseptal

26
Q

GFL fiber group that resists gingival displacement only:

A

Dentogingivial, Alveologingival, Circumferential

27
Q

GFL fiber group that resists gingival displacement and tooth separation:

A

Semicircular

28
Q

What fiber groups are involved in orthodontic relapse:

A
  1. Transeptal fibers (GFL)
  2. Semicircular fibers (GFL)
  3. PDL principle fibers groups
29
Q

The PDL interstitial spaces are a source of mesenchymal cells that can differentiate into: (3)

A
  1. cementoblasts
  2. osteoblasts
  3. fibroblasts
30
Q

Function in regeneration and repair of cementum following injury

A

Cementoblasts

31
Q

Function in the continuous physiologic remodeling of supporting alveolar bone:

A

osteoblasts

32
Q

Function in the continuous physiologic deposition of cementum:

A

cementoblasts

33
Q

Function in the regeneration and repair of bone following orthodontic therapy or disease:

A

osteoblasts

34
Q

Have various phenotypes that are involved in collagen production and physiologic collagen degredation:

A

fibroblasts

35
Q

Fusion of cementum directly with the surrounding alveolar bone, without intervening PDL:

36
Q

Ankylosis is the fusion of ____ directly with the surrounding ____, without the intervening PDL

A

cementum; alveolar bone

37
Q

Ankylosis is usually a reparative response to:

A

PDL injury

38
Q

In ankylosis, what dictates the type of response?

A
  1. degree of injury
  2. type of cells
39
Q

If the injury is significant and the cells that respond are from surrounding alveolar bone, this will result in:

40
Q

If the injury is slight, and the responding cells are from the PDL (undifferentiated cells), these cells have the potential to ______ involved in tooth support, and the ____ will be restored

A

regenerate all tissues; PDL

41
Q

The ____ response is similar to the trauma response of the PDL

A

wound healing response

42
Q

Role of PDL in wound healing:

In the first step of wound healing, _____ cells migrate into the area as _____ and ____ remove damaged tissue

A

undifferentiated cells; macrophages and PMNs

43
Q

Role of PDL in wound healing:

In the second step of wound healing, _____ and/ or ____ replace the damaged tissue.

A

fibroblasts/and or osteoblasts

44
Q

Role of PDL in wound healing:

In the third step of wound healing, a _____ cell response is usually present in which ____ & _____ are released- this inflammatory response helps the necessary cells reach their target.

A

mast cell; heparin and histamine

45
Q

A surgical technique of regenerating the periodontal attachment apparatus on periodontally involved teeth uses, which uses the differentiation of mesenchymal cells in the interstitial spaces of the PDL and marrow spaces of adjacent alveolar bone.

A

Guided Tissue Regeneration

46
Q

In guided tissue regeneration, the membrane excludes ____ from the deeper part of the wound , and allows only cells from the existing ____ to repopulate the wound.

A

gingival epithelial tissues; PDL

47
Q

Remains of Hetwigs root sheath- duct-like appearance with an unknown purpose

A

Epithelial Rests of Malassez

48
Q

_____ are most prevalent in the apical areas of adolescents and may have some effect on cementogenisis

A

epithelial rests of malassez

49
Q

cyst that typically occurs along the lateral root surface. It is believed to arise from epithelial rests ( epithelial rests of malassez in the PDL), when stimulated. Treatment consists of surgical removal:

A

lateral periodontal cyst

50
Q

cyst derived from odontogenic epithelium located in the connective tissues of the gingiva known as the epithelial rests of serres

A

gingival cyst

51
Q

The gingival cyst is derived from odontogenic epithelium located in the connective tissues of the gingiva known as the:

A

epithelial rests of serres

52
Q

Results in compression of the PDL on the side of the root corresponding to the direction of movement. Compression of the PDL results in loss of principle fiber orientation and resorption of adjacent bone:

A

orthodontic tooth movement

53
Q

The PDL on the tooth root opposite the compression side is characterized by tension or stretching of the PDL principle fibers. Controlled tension results in bone apposition:

A

Orthodontic movement

54
Q

Controlled tension of the PDL results in:

A

bone apposition

55
Q

The direction of tooth movement is the same/opposite of compression or tension:

56
Q

Excessive functional stresses placed on the tooth by an antagonist (or removable prosthesis) that exceeds the limits of physiologic adaptation:

A

trauma from occlusion

57
Q

-Resorption of alveolar bone parallel to the long axis of the root
- A PDL that is wider than normal average width
- Tooth mobility

These are all characteristics of:

A

Trauma from occlusion

58
Q

A tooth with no occlusal antagonist will exhibit:

A

Disuse Atrophy

59
Q
  • a significant decrease in density of bony trabeculae
  • decreased width of PDL
  • loss of orientation of the principle fibers of the PDL
  • increased volume of the bone marrow spaces

These are all characteristics of:

A

Disuse atrophy

Histopathology (15 decks)

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