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Oral Histology > Periodontal Ligament > Flashcards

Periodontal Ligament Flashcards

(47 cards)

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1
Q

Periodontal ligament is what type of articulation/joint?

A

Syndesmosis

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2
Q

What part of root is the PDL thinnest?

A

Midroot

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3
Q

Dental tissue which serves as shock absorber?

A

PDL

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4
Q

A test used to detect inflammation in the periradicular tissues?

A

Percussion

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5
Q

2 sensations PDL can register?

A
  • Pain
  • Pressure
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6
Q

True or false. Periodontal ligament can undergo remodelling?

A

True

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7
Q

Functions of PDL? (4)

A
  1. supportive
  2. sensory
  3. homeostasis
  4. nutritive
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8
Q

Cells of the PDL? (4)

A
  • fibroblast
  • cemento/osteoprogenitor cells
  • epithelial rest of malassez
  • undifferentiated cells/progenitor cells
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9
Q

Principal cells of PDL?

A

Fibroblasts

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10
Q

Has the highest rate or collagen turnover?

A

Fibroblast

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11
Q

Cell esponsible for both synthesis and dgradation of collagen?

A

Fibroblast

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12
Q

Provides strong mechanical attachments between adjacent cells?

A

Adherens

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13
Q

Specialized focal contacts in ECM formed by the fibroblast?

A

Fibronexus

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14
Q

Concavities where cementoclast/osteoclast are located?

A

Howship’s lacunae

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15
Q

True or false. Epithelial rests of Malassez are continuously released?

A

True

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16
Q

Secreted by the epithelial rest of malassez which regulates PDL?

A

Epithelial growth factor

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17
Q

Cells of the PDL located around the blood vessels?

A

Unmyelinated/progenitor cells

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18
Q

3 connective tissue fibers of the PDL.

A
  • Collagen fibers
  • Oxytalan
  • Elaunin fiber
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19
Q

Type of collagen fibers predominant in PDL? (2)

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A
  • Type 1
  • Type 3
20
Q

Principal fiber bundles from cementum to bone?

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A

Dentoalveolar fibers

21
Q

Type of collagen fiber:

Resist vertical and intrusive forces? (2)

Study These Flashcards
A
  • Alveolar crest
  • Oblique fibers
22
Q

Type of collagen fiber:

Anchors the tooth to the alveolus?

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A

Alveolar crest fibers

23
Q

Type of collagen fiber:

Resist lateral pressure applied to tooth crown?

Study These Flashcards
A

Horizontal fibers

24
Q

Type of collagen fiber:

Prevents vestibulooral tipping?

Study These Flashcards
A

Apical fibers

25
Type of collagen fiber: Resist tipping and torque?
Interradicular fibers
26
True or false. Fiber insertions are wider in cementum than in bone side?
False. Wider in bone side
27
Increased functional load causes widening ot narrowing of the periodontal space?
Widening
28
Contents of the interstitial space?
* Blood vessels * Nerves * Lymphatics * Interstitial tissue
29
Bundles of microfibrils?
Oxytalan
30
Acid resistant CT fibers?
Oxytalan
31
Fibers confined to the walls of blood vessels?
Elastic fibers
32
Fibers supporting blood vessels, lymphatics, and nerves?
Reticular fibers
33
Amorphous material that binds the tissues and fluids?
Ground substance 70% water
34
Vascular supply of the PDL. (3)
* dental artery * interalveolar and interradicular arteries * periosteal arteries
35
Interalveolar and interradicular arteries passes through what canal?
Volkman's canal
36
The nerves of the PDL passes through what canal?
Canal of Zuckerkandl and Hirschfeld
37
Types of neural termination? (4)
* free nerve endings * ruffini corpuscles * coiled endings * encapsulated spindle type ending
38
Most frequent type of nerve endings?
Free nerve endings
39
Nerve endings that appear dendritic and ends in terminal expansion?
Ruffini corpuscles
40
Mechanoreceptor nerve endings which perceives pressure?
Ruffini corpuscle
41
Nerve ending found at the root apex?
Ruffini corpuscle
42
Nerve ending found in the midregion of the PDL?
Coiled endings
43
Nerve ending with the lowest frequency?
Encapsulated spindle type
44
Nerve ending whose function is not determined?
Coiled ending
45
Continuous with intermediate fibers apical to the epithelial diaphragm?
Cushion Hammock ligament
46
Zone of loose, not well oriented collagen fibers?
Intermediate plexus
47
True or false. Intermediate plexus cannot be found in a completely formed PDL?
True

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