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Oral A&P > PDL > Flashcards

PDL Flashcards

1
Q

PDL is also known as…

A

periodontal membrane or suspensory attatchment

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2
Q

Where is PDL located

A

between the alveolar bone and the cementum

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3
Q

how thick is the PDL

A

.15 - .38 mm

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4
Q

What makes up the PDL(8)

A

-collagen *
-fibroblasts *(most prolific)
-Epithelial Cells(HERS)
-Osteoclasts and Osteoblasts
-Macrophages
-Extracellular material
-Cementum(cementicles)
-blood vessels & nerves

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5
Q

Functions of PDL

A

Supportive: stretch when we clench our teeth , most important function

Formative: helps cementum during it s growth

Sensory: has abundant nerve receptors ; can sense pain and proprioception

Nutritive: Very vascular which provides a lot of nutrients

Resorptive: resorptive function allows us to move teeth orthodontically; the fibers resorb and then grow again

Maintainance: constantly building up and breaking down; constantly being replaced ; this is essential to prevent pocketing

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6
Q

What are sharpeys fibers

A

Sharpeys fibers attatches the PDL to the cementum

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7
Q

What are the two principle fiber groups?

A

-Gingival Fibers
-Dentoalveolar Fibers

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8
Q

Which fibers are included in the Gingival Fibers Group

A

-Free Gingival Fibers
-Attached Gingival Fibers
-Circular/Circumferential Fibers
-Transseptal Fibers

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9
Q

Which fibers are included in the Dentoalveolar Fibers Group

A

-Alveolar Crest Fibers
-Horizontal Fibers
-Oblique Fibers
-Apical Fibers
-Interradicular Fibers

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10
Q

Free Gingival Fibers
Location
Function

A

-go from the cementum in the cervical area to the free gingiva

-support gingiva and keep tooth in place

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11
Q

Attached Gingival Fibers
Location
Function

A

-go from alveolar crest into attached gingiva
-support gingiva and keep tooth in place

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12
Q

Circumferential Fibers
Location
Function

A

-continuous around the neck of the tooth
-helps support the tooth and keep it in position

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13
Q

Transseptal Fibers
Location
Function

A

-cervical region of each crown and connects to the same area in adjacent tooth

-keep teeth together and prevent side to side movement

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14
Q

Alveolar Crest Fibers
Location
Function

A
  • go from the crest of alveolar bone to the cervical area of the root into the gingival CT

-support teeth and resist traumatic forces & up and down forces

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15
Q

Horizontal Fibers
Location
Function

A

-found in the middle of the root and goes to alveolar bone

-support teeth and resist side to side movement

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16
Q

Oblique Fibers*
Location
Function

A

*these fibers are the MOST NUMEROUS
-they extend in an oblique fashion from just above the apical 3rd to the alveolar bone

-support tooth , resists traumatic forces, up & down movement and rotational forces

17
Q

Apical Fibers
Location
Function

A

-found at the apex and goes to the fundic alveolar bone

-support tooth and resist up & down forces

18
Q

Interradicular Fibers
Location
Function

A

-found between roots of multi-rooted teeth and go to the alveolar bone

-resists up & down and side to side forces and supports teeth

19
Q

What are interstitial spaces

A

-space between collagen bundles

-Oxytalon fibers, vessels, nerves & lymphatics (interlacing fibers) are located here

20
Q

What are oxytalan fibers

A

elastic-like short fibers that lay beside and interlace collegen fibers that help hold the blood vessels in place

21
Q

Where does the PDL receive its nourishment

A

Superior Alveolar Artery and Inferior Alveolar Artery

22
Q

Where do the vessels that supply the PDL enter

A

-fundus of the alveolus

-sides of the alveolus from bone marrow spaces

-deeper branches of gingival blood vessels that pass over alveolar crest

23
Q

The PDLs suspensory apparatus helps protect it by…

A

detecting pressure

24
Q

the nerve trunk which is larger in the center of the tooths long axis branches and sends fibers to the …

A

bone and gingiva

25
Q

In the area of compression there will be —- activity

A

osetoclastic

26
Q

in the area of force there will be — activity

A

osteoblastic

27
Q

What happens to the PDL with aging

A

-scalloping or wavy in appearance
-cell number and cell activity decreases
-if a tooth is lost the antagonists’ fibers will become loose and wavy

28
Q

When the PDL is thickened this is a sign of…

A

infection pushing the tooth out of the socket

Oral A&P (6 decks)

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