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histopath > exam 2: gingival fiber ligament (GFL) and periodontal ligament (PDL) > Flashcards

exam 2: gingival fiber ligament (GFL) and periodontal ligament (PDL) Flashcards

1
Q

functions of the GFL- gingival fiber ligament:

  1. provides rigidity and density to the
A

marginal gingiva

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2
Q

functions of the GFL- gingival fiber ligament:
2. act as a periosteum for the

A

interproximal crestal alveolar bone

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3
Q

functions of the GFL- gingival fiber ligament:
3. provide one-half of the _____-width

A

1/2 biologic width

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4
Q

functions of the GFL- gingival fiber ligament:
4. act as a protective barrier for the crestal alveolar bone against the spread of

A

gingival inflammation

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5
Q

functions of the GFL- gingival fiber ligament:
5. inhibit the apical migration of the

A

junctional epithelium

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6
Q

GFL fiber groups

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

where is the area of the biological width

A

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

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8
Q

biological width extends from the most coronal attachment of the junctional epithelium to the

A

crestal alveolar bone

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9
Q

violation of the biological width due to placement of overextended restoration margins will result in __________________ and with time, induce loss of supporting alveolar bone with formation of a diseased _____________

A

chronic inflammation

diseased periodontal pocket

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10
Q

5 functions of the PDL

A

supportive
regenerative
nutritional
sensory
protective

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11
Q

the PDL is derived from the ectomesenchymal cells (neural crest) in the _________ zone of the dental follicle

A

intermediate zone

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12
Q

PDL development.

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

outer(peripheral=alveolar bone proper

inner(proximal)=cementoblasts

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13
Q

(insertion of the PDL in cementum: SEM)

the indifferent fiber plexus (arrows) consists of small diameter collagen in ____________that provide support for the principle fibers group

A

random orientation

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14
Q

resident cell populations of the PDL
1
2
3
4
5
6
7

A
  1. fibroblasts
  2. osteoblasts
  3. cementoblasts
  4. macrophages
  5. undifferentiated mesenchymal cells
  6. endothelial cells
  7. epithelial cells
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15
Q

PDL fiber groups
1
2
3
4
5

A

alveolar crest
horizontal
oblique
apical
interradicular

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16
Q

PDL fiber group that
resist vertical force

A

apical

17
Q

PDL fiber group that
resist intrusive force

A

oblique

18
Q

PDL fiber group that
resist horizontal and tipping force

A

horizontal

19
Q

PDL fiber group that
resist vertical force

A

alveolar crest

20
Q

PDL fiber group that
resist vertical and lateral force

A

interradicular

21
Q

all PDL fiber groups resist what forces

A

rotational

22
Q

GFL fiber group that
resist tooth separation
1
2

A

transeptal and semicircular

23
Q

GFL fiber groups that
resist gingival displacement
1
2
3
4

A

dentogingival
alveologingival
circumferential
semicircular

24
Q

orthodontic relapse:
1
2
3

A

transseptal fibers
semicircular fibers
PDL principle fiber groups

25
Q

the PDL interstitial spaces are a source of mesenchymal cells that can differentiate into:

A

cementoblasts
osteoblasts
fibroblasts

26
Q

-regeneration and repair of cementum following injury
-continuous physiologic deposition of cementum

A

cementoblasts

27
Q

-continuous physiologic remodeling of supporting alveolar bone
-regeneration and repair of bone following orthodontic therapy or disease

A

osteoblasts

28
Q

-various phenotypes of fibroblasts are involved in collagen production and physiologic collagen degradation

A

fibroblasts

29
Q

fusion of CEMENTUM directly with the surrounding ALVEOLAR BONE without the intervening PDL

-usually reparative response to PDL injury

A

ankylosis

30
Q

if the degree of injury is SIGNIFICANT and the cells that respond are from the surrounding alveolar bone the result will be:

if the injury is SLIGHT and responding cells are from PDL (undifferentiated cells), result would be:

A

significant= ankylosis

slight= cells can regenerate all tissues involved in tooth support and PDL will be restored

31
Q

wound healing of PDL is similar to trauma response of PDL:

  1. undifferentiated cells migrate into the area as ________ and PMN’s remove damaged tissues
  2. these 2 cells replace the damaged tissue
  3. a mast cell response is present in which ______ and _____ are released- this inflammatory response helps necessary cell reach their target
A
  1. macrophages
  2. fibroblasts and osteoblasts
  3. heparin and histamine
32
Q

(guided tissue regeneration)

the membrane excludes ___________ from the deeper part of the wound and allows only cells from existing PDL to repopulate the wound

A

gingival epithelium

33
Q

remains of Hetwig’s root sheath-
duct like appearance and purpose unknown

A

epithelial rests of malassez

34
Q

this typically occurs along the lateral root surface
-arise from epithelial rests (rest of malassez in PDL) when stimulated
-remove surgically

A

lateral periodontal cyst

35
Q

GINGIVAL CYST is derived from odontogenic epithelium located in the connective tissues of the gingiva known as the

A

epithelial rests of Serres

36
Q

orthodontic tooth movement 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:
and resorption of:

the PDL on the root opposite the compression side is characterized by _____ or ______ of the PDL principle fibers. controlled tension results in bone apposition

A

loss of principle fiber orientation and resorption of adjacent bone

tension or stretching of PDL

37
Q

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

A

trauma from occlusion

38
Q
  1. resorption of alveolar bone parallel to the long axis of the root
  2. PDL that is wider
  3. tooth mobility
A

trauma from occlusion

39
Q

tooth with no occlusal antagonist will exhibit:
1
2
3
4

A

(diuse atrophy)
1. decrease in density of bony trabeculae
2. decreased width of PDL
3. loss of orientation of principle fibers of PDL
4. increased volume of bone marrow spaces

histopath (13 decks)

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