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IOE > PDL > Flashcards

PDL Flashcards

1
Q

how to tell diff between ppl and cementum fibres

A

pdl fibres thicker and widely spread

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2
Q

how is pdl inserted into bone

A

osteoclasts enable remodelling

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3
Q

is pdl mineralised

A

no

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4
Q

what is pdl

A

non mineralised connective tissue between AV and cementum

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5
Q

5 cells in pdl

A
  1. fibroblasts
  2. non collagenous proteins
  3. cementblasts and osteoclasts
  4. ERM
  5. macrophages
  6. osteoclast and odontoblast
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6
Q

location of non collagenous proteins

A

between principal collagen fibres

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7
Q

2 non collagenous proteins that form ground space

A

glycoproteins and proteoglycans

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8
Q

fibroblasts role

A

synthesise and degrade collagen fibres
–fibroblasts have lot of rough end reticulum for transport of proteins
-repsonsible for high rate of protein turnover

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9
Q

how do fibroblasts degrade collagen fibres

A

-lysosomes fuse with phagosomes containing collagen fibrils
-phago-lysosomes degrade collagen fibrils

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10
Q

why does fibroblasts have a lot of rough end ret

A

production and exportation of proteins

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11
Q

role of rests of malasezz/ epithelial cell rests

A

remnants of HERS, have no particular role, may divide to form cysts
-hey may have important functions in the homeostasis of the periodontal ligament and may help to maintain the integrity of the PDL space.

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12
Q

role for macrophage

A

monocyte deritivative, act as defence system

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13
Q

4 fibres that make up pdl

A

collagen
oxytalan
elastin
eluanin

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14
Q

what is collagen type 3 called

A

reticulin fibres

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15
Q

collagen type 1 role

A

70%
assembles into principal fibres
contains non collagenous proteins
assembles and controls orientation of fibres

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16
Q

principle collagen fibres

A

fibres group that show diff orientations at Dif regions of ligament

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17
Q

5 variations of principle fibres

A
  1. dento-alveolar crest fibres
  2. horizontal fibres
  3. oblique fibres
  4. apical fibres
  5. interradicular fibres
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18
Q

role of reticulin (Coll type 3) fibres

A

cross link to aid tissue support
-for rapid turnover

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19
Q

2 fibres that associate with blood vessels

A
  1. elastin- walls of blood vessels
  2. elanuanin- around blood vessels to provide mechanical protection
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20
Q

3 functions of PDL

A

-protects dental tissue from excessive occlusal loads
-resists displacing forces
-contains essential cells to form, maintain and repair AV bone

21
Q

pdl tooth support mechanism

A

-biphasic response to axial loading
-load dissipated through oblique fibre system
-uses compression and fluid flow to resist forces

22
Q

what is biphasic phase

A

visco-elastic

23
Q

4 tissues of periodontium

A

-AV bone
-pdl
-lamina propria
-cementum

24
Q

what is lamina propria

A

connective fibrous tissue that forms bundles to support free gingiva
-forms fibres that link gingiva to AV bone and teeth

25
Q

what is gingival cuff

A

region of attatchment of gingiva to tooth

26
Q

junctional epithelium

A

non keratinised epithelium that attaches gingiva to tooth
-forms an epithelial collar that surrounds the cervical part of the crown and extends from the base of the gingival crevice to the cementum-enamel junction or CEJ.

27
Q

structure of junctional epithelium

A

2 basal lamina, one on each side- face the tooth and lamina propria
-connect to enamel and lamina propria via hemidesmosomes

28
Q

why are sharpens fibres partly mineralised

A

mineralised within the cementum but not within the PDL

29
Q

which aspect of sharpeys fibres are larger

A

AV bone

30
Q

which aspect of sharpens fibre numerous

A

cementum

31
Q

blood supply to pdl

A

arteries from AV, pulp and gingiva supply ligament with nutrition
capillary volume is high

32
Q

how are capillaries specialised

A

fenestrations

33
Q

how capillaries between av bone and cementum communicate

A

volksmann canals

34
Q

average width of periodontal space

A

0.25mm

35
Q

junctional epithelium function

A

It has some unique features including:
1. a rapid rate of turnover and
2. is permeable to both gingival crevicular fluid (GCF) and host defence cells.
It therefore facilitates defence of the underlying tissue against bacterial invasion.

36
Q

compare pdl and lamina propria

A

Compared to the periodontal ligament, lamina propria extracellular matrix has less ground substance and less type III collage. It also has a lower turnover rate.

37
Q

Periodontal ligament nerves:

A

The nerve fibres supplying the PDL are of two types: sensory and autonomic

38
Q

sensory pdl nerves

A
  1. The sensory fibres are associated with nociception and mechanoreception.
39
Q

autonomic pdl nerves

A
  1. The autonomic fibres are associated with the supply of the periodontal blood vessels
40
Q

PDL mechanoreceptors

A

play an important role in the transmission of touch and textural information during mastication. They also provide afferent feedback essential in the control of salivation,
mastication and swallowing.

41
Q

Periodontal blood supply:

A

The periodontium has a very rich blood supply derived from the superior or inferior alveolar arteries.
The majority of capillaries within the ligament have their origin in the intra-bony spaces within the alveolus.
The capillaries and arterioles within the ligament form a plexus around the tooth which is primarily situated towards the socket wall, between the principal fibre bundles, and may occupy up to 50% of the periodontal space. This is an extremely high percentage volume compared to other adult connective tissues.

42
Q

how much oxytalan

A

3%

43
Q

what is oxytalan?

A

extracellular fibre composition

44
Q

how is oxytalan arranged on outer pdl

A

on the outer part of the ligament these fibres run obliquely down from the cementum to terminate in the vicinity of the periodontal capillaries.

45
Q

how is oxytalan arranged inner pdl

A

Within the periodontal ligament proper they tend to be more longitudinally oriented, crossing the oblique fibre bundles more or less perpendicularly.

46
Q

oxytalan function

A

There is no clear idea as to their function although it has been suggested that these fibres might aid fibroblast migration in the periodontal
ligament.

47
Q

oxytalan composition

A

that they are immature elastin fibres or ‘pre-elastin’ in that, unlike mature elastin, there is no central amorphous core.

48
Q

foetal like properties

A

-like foetal
-Unlike other adult connective tissues, the PDL has a high rate of turnover of the extracellular matrix
-high proportion of type III collagen.
-Its high cellularity and the presence of oxytalan fibres are also unusual.

IOE (1 decks)

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