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Oral Biology > PDL > Flashcards

PDL Flashcards

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1
Q

average width of PDL

A

about .15-.4 mm and is considered to be about a quarter of a millimeter
thinnest at the mid-radiular aspect of the tooth. - hourglass shape.
decreases with age of patient by about .05-.10 mm

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2
Q

PDL two components

A

extracellular fibers - ECM/matrix - the ligament connecting part
Cells - the maintenance or regeneration aspect. comprised of fibroblasts and neurovascular elements

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3
Q

height of PDL

A

coincides with the height of the cribriform plate of alveolar bone
Approx. 1-2 mm apical to CEJ
CEJ–> crest of bone about 1-22 mm

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4
Q

three main functions of the PDL

A

Attachment - via the tensile strength components
Adaption - via the viscoelastic components (withstand the forces and bruxism +nocturnal grinding)
Sensory perception - via the nerves - properly position teeth during chewing and withstand forces

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5
Q

Rheologic Principle

A

fluids under pressure are incompressible - application of force on tooth displaces fluids either through the foramina of the cribriform plate or onto other PDL regions - causes dilation / widening of the socket due to fluid displacement

abnormal widening of PDL seen on radiographs - significant marker for occlusal overload?

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6
Q

collagen fiber groups in PDL (from CEJ to apical)

A 
alveolar crest 
horizontal
oblique
apical 
interradicular group
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7
Q

alveolar crest group

A

attach to cementum 1-2 mm apical to CEJ - run apically in an oblique direction toward the alveolar bone
insert into the coronal crest of aveolar bone

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8
Q

lateral periodontal cyst

A

from the HERS and the Rest cells of M. - could result in this and lead to a translucent in a radiograph - by the activaiton of the rests cells

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9
Q

immature elastic fiber variants

A

in the PDL - and because they are immature result in the dynamic aspects of the PDL
examples - oxytalin and Elaunin

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10
Q

oxytalin and elaunin

A

immature elastic fiber variants

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11
Q

dermatan sulfate

A

main proteoglycan / glycosaminoglycan in the PDL

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12
Q

% of water in pdl and reason

A

70% - due to the viscoelastic feature of the PDL (also why we have immature elastin)

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13
Q

what does the PDL develop from?

A

From the dental follicle - sometimes referred to as the sac

-originally derived from ectomesenchymal cells from neural crest cells

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14
Q

importance of lysyl oxidase?

A

needed for collagen biosynthesis - lysyl oxidase dependent cross linking

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15
Q

changes in alveolar crest fibers as tooth errupts

A

first oblique –> horizontal–> then oblique the other way (inserting into the coronal crest)

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16
Q

hyperfunction in PDL

A

due to traumatic occlusion and leads to widening of the PDL
- primarily due to fluid displacement and results in not only widening of the PDL but also the collagen fibers and the bone
- increasing width of PDL
can see this radiographically and histologically

17
Q

tooth avulsion

A
  • means pulling or tearing away

- reattachment of PDL can occur in two ways - ankylosis or by gomphosis

18
Q

reattchment of PDL in tooth alvulsion - two mechanisms

A

ankylosis - if there is NO source dental follicle cells - basically the bones fusing
gomphosis - if there IS A SOURCE DENTAL FOLLICLE CELLS

19
Q

guided tissue regeneration

A

selective re-population by PDL cells via use of a PHYSICAL barrier that excludes gingival fibroblasts and epithelial cells - trying to get back CELLULAR CEMENTUM FORMATION??

20
Q

Emdogain

A

mimics the embryologic development events via use of enamel protiens
trying to get back ACELLULAR CEMENTUM FORMATION?? - main cementum for attachment

21
Q

hyalinization

A

the light microscopy term for trauma-induced acellularity of the PDL

22
Q

which fibers are believed to provide the mechanism for eruptive tooth movement and also for the phenomenom of vertical drift?

A

OBLIQUE fibers

23
Q

mesial drift?

A

due to the transseptal fibers of the gingiva - anterior component of occlusal forces

Oral Biology (12 decks)

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