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Oral Histology > Periodontal Ligament > Flashcards

Periodontal Ligament Flashcards

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)

A
  • Type 1
  • Type 3
20
Q

Principal fiber bundles from cementum to bone?

A

Dentoalveolar fibers

21
Q

Type of collagen fiber:

Resist vertical and intrusive forces? (2)

A
  • Alveolar crest
  • Oblique fibers
22
Q

Type of collagen fiber:

Anchors the tooth to the alveolus?

A

Alveolar crest fibers

23
Q

Type of collagen fiber:

Resist lateral pressure applied to tooth crown?

A

Horizontal fibers

24
Q

Type of collagen fiber:

Prevents vestibulooral tipping?

A

Apical fibers

25
Q

Type of collagen fiber:

Resist tipping and torque?

A

Interradicular fibers

26
Q

True or false. Fiber insertions are wider in cementum than in bone side?

A

False. Wider in bone side

27
Q

Increased functional load causes widening ot narrowing of the periodontal space?

A

Widening

28
Q

Contents of the interstitial space?

A
  • Blood vessels
  • Nerves
  • Lymphatics
  • Interstitial tissue
29
Q

Bundles of microfibrils?

A

Oxytalan

30
Q

Acid resistant CT fibers?

A

Oxytalan

31
Q

Fibers confined to the walls of blood vessels?

A

Elastic fibers

32
Q

Fibers supporting blood vessels, lymphatics, and nerves?

A

Reticular fibers

33
Q

Amorphous material that binds the tissues and fluids?

A

Ground substance

70% water

34
Q

Vascular supply of the PDL. (3)

A
  • dental artery
  • interalveolar and interradicular arteries
  • periosteal arteries
35
Q

Interalveolar and interradicular arteries passes through what canal?

A

Volkman’s canal

36
Q

The nerves of the PDL passes through what canal?

A

Canal of Zuckerkandl and Hirschfeld

37
Q

Types of neural termination? (4)

A
  • free nerve endings
  • ruffini corpuscles
  • coiled endings
  • encapsulated spindle type ending
38
Q

Most frequent type of nerve endings?

A

Free nerve endings

39
Q

Nerve endings that appear dendritic and ends in terminal expansion?

A

Ruffini corpuscles

40
Q

Mechanoreceptor nerve endings which perceives pressure?

A

Ruffini corpuscle

41
Q

Nerve ending found at the root apex?

A

Ruffini corpuscle

42
Q

Nerve ending found in the midregion of the PDL?

A

Coiled endings

43
Q

Nerve ending with the lowest frequency?

A

Encapsulated spindle type

44
Q

Nerve ending whose function is not determined?

A

Coiled ending

45
Q

Continuous with intermediate fibers apical to the epithelial diaphragm?

A

Cushion Hammock ligament

46
Q

Zone of loose, not well oriented collagen fibers?

A

Intermediate plexus

47
Q

True or false. Intermediate plexus cannot be found in a completely formed PDL?

A

True

Oral Histology (11 decks)

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