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Oral Histology > periodontium I - cementum and PDL > Flashcards

periodontium I - cementum and PDL Flashcards

1
Q

what is the only part of the periodontium that DOES NOT remodel

A

cementum

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2
Q

T/F all types of cementum contain type I collagen

A

true

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3
Q

what types of cementum have sharpeys fibers

A

AEFC and CMFC

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4
Q

what type of cementum DOES NOT have sharpeys fibers

A

CIFC

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5
Q

what type of cementum has a SLOW rate of deposition

A

AEFC

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6
Q

what types of cementum have a FAST rate of depostion

A

CIFC and CMFC

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7
Q

what cementum is found at the cervical 2/3 of root

A

AEFC

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8
Q

what cementum is found at mid-apical 1/3 root

A

CIFC

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9
Q

what cementum is found at apical 1/3 of root

A

CMFC

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10
Q

functions of cementum

A

-Tooth anchorage via PDL attachment
* Protection of the dentin-pulp complex;
* Adaptation (reshaping of root) due
to occlusal wear
* Repair from damage

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11
Q

what are extrinsic fibers of the PDL

A

sharpeys fibers

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12
Q

what represent deposition of cementum over time

A

Incremental lines of Salter (resting/cement lines)

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13
Q

if the Incremental lines of Salter (resting/cement lines) have close lines does that mean there was a slow or fast rate

A

SLOW

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14
Q

if the Incremental lines of Salter (resting/cement lines) have wide lines does that mean there was a slow or fast rate

A

FAST

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15
Q

what type of resorption can cementum undergo due to trauma

A

EXTERNAL root resorption

bc cementum is on EXTERNAL surface

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16
Q

can cementum show reversal lines?

A

yes!

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17
Q

T/F: cementum cannot repair

A

FALSE. CIFM and CMFC can!!!!

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18
Q

can cementum remodel

A

NO! no blood supply

reversal lines seen at exfoliation indicate REPAIR not true
remodeling

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19
Q

function of PDL

A

Supportive –serves as attachment site; withstands masticatory forces
Maintenance -high degree of turnover due mechanical stress

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20
Q

what types of sensory receptors can we find in the PDL

A

mechanoreceptors = ruffini
nociceptors = FNE

21
Q

what do the mechanoreceptors in the PDL detect

A

detect pressure/stretch/proprioception:
o control bite force,
o provide feedback about duration,
o intensity and direction of applied force

22
Q

what do the nociceptors in the PDL detect

A

pain and temp

23
Q

do we find autonomics in the PDL

A

yes! sympathetics -> control BV

24
Q

is the PDL well vascularized and supplies bone, cementum, gingiva
and if so, do the blood vessels form anastomoses between gingiva, bone, and PDL

A

yes yes

25
Q

what cells are found in the PDL

A

Cementoblasts
fibroblasts
osteoblasts
osteoclasts
epithelial cell rests
macrophages/ WBC
undifferentiated STEM CELLS

26
Q

what is the area called in the PDL that contains N, BV and lymphatic vessels

A

interstitial space

27
Q

what are distinct fiber bundles that are recognized following eruption as tooth enters occlusion

A

principal fiber bundles of the PDL

28
Q

2 groups of principal fiber bundles

A

Dento-alveolar fiber group – found between tooth and alveolus

Dento Gingival (supra-alveolar) group- found in lamina propria of gingiva
above alveolar crest

29
Q

periodontal ligament appears as a radiolucent area of 0.15 to .24mm located between the ___________ and radiopaque lamina dura of the alveolar bone

A

radiopaque cementum

30
Q

5 types of dento-alveolar fibers

A

alveolar crest
horizontal
oblique
apical
inter-radicular

31
Q

fiber bundles that are found mid-root

A

horizontal

32
Q

what is the function of horizontal fibers

A

resist tipping and horizonral movements

33
Q

fiber bundles that are found apical 1/3

A

oblique

34
Q

what is the most abundant fiber bundle

A

OBLLQUE!!!

35
Q

fiber bundles that are found apex to fundic bone

A

apical

36
Q

fiber bundles that are found b/w roots

A

inter-radicular

37
Q

T/f

in dento-gingival fiber group, Fiber bundles DO attach to the alveolar socket (alveolar bone proper)

A

FALSE

Fiber bundles DO NOT attach to the alveolar socket (alveolar bone proper)

extend from gingiva to cortical bone or cementum

38
Q

functions of dento-gingival fiber groups

A

hold (marginal/free) gingiva against the tooth:
* Protect against periodontal infection
* Reinforce the connection of junctional epithelium to tooth
* Provide rigidity to withstand masticatory force without distortion
* Reinforce the connection between the free and attached gingiva
* Link adjacent teeth and gingiva together

39
Q

what are the 5 types of dento-gingival fiber groups

A

circular
alveolo-gingival
dentogingival
dentoperiosteal
transeptal

40
Q

what fiber group encircles the tooth but DOES NOT ATTACH TO TOOTH

A

circular

41
Q

what fiber group is from alveolar crest –> AG/FG

A

alveolo-gingival

42
Q

what fiber group is from CEJ –> AG/FG

A

dentogingival

43
Q

what fiber group is from CEJ –> cortical palte

A

dentoperiosteal

44
Q

what fiber group is from CEJ –> another CEJ

A

transeptal

45
Q

which fiber group prevents mesial distal separation

A

transeptal

46
Q

what happens to our PDL space as we age

A

gets skinner and there is a decrease in turnover

47
Q

hypofunction of PDL leads to

A

decrease in PDL space

48
Q

for ortho, what all is happening on the TENSION SIDE

A

TENSION SIDE = bone formation via OB

increase in remodeling!

49
Q

for ortho, what is all happening on the COMPRESSION SIDE (side tooth is tipping towards)

A

COMPRESSION SIDE = bone resorption via OC

Oral Histology (12 decks)

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