periodontium I - cementum and PDL

Question 1

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

Answer 1

cementum

Question 2

T/F all types of cementum contain type I collagen

Answer 2

true

Question 3

what types of cementum have sharpeys fibers

Answer 3

AEFC and CMFC

Question 4

what type of cementum DOES NOT have sharpeys fibers

Answer 4

CIFC

Question 5

what type of cementum has a SLOW rate of deposition

Answer 5

AEFC

Question 6

what types of cementum have a FAST rate of depostion

Answer 6

CIFC and CMFC

Question 7

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

Answer 7

AEFC

Question 8

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

Answer 8

CIFC

Question 9

what cementum is found at apical 1/3 of root

Answer 9

CMFC

Question 10

functions of cementum

Answer 10

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

Question 11

what are extrinsic fibers of the PDL

Answer 11

sharpeys fibers

Question 12

what represent deposition of cementum over time

Answer 12

Incremental lines of Salter (resting/cement lines)

Question 13

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

Answer 13

SLOW

Question 14

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

Answer 14

FAST

Question 15

what type of resorption can cementum undergo due to trauma

Answer 15

EXTERNAL root resorption

bc cementum is on EXTERNAL surface

Question 16

can cementum show reversal lines?

Answer 16

yes!

Question 17

T/F: cementum cannot repair

Answer 17

FALSE. CIFM and CMFC can!!!!

Question 18

can cementum remodel

Answer 18

NO! no blood supply

reversal lines seen at exfoliation indicate REPAIR not true
remodeling

Question 19

function of PDL

Answer 19

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

Question 20

what types of sensory receptors can we find in the PDL

Answer 20

mechanoreceptors = ruffini
nociceptors = FNE

Question 21

what do the mechanoreceptors in the PDL detect

Answer 21

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

Question 22

what do the nociceptors in the PDL detect

Answer 22

pain and temp

Question 23

do we find autonomics in the PDL

Answer 23

yes! sympathetics -> control BV

Question 24

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

Answer 24

yes yes

Question 25

what cells are found in the PDL

Answer 25

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

Question 26

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

Answer 26

interstitial space

Question 27

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

Answer 27

principal fiber bundles of the PDL

Question 28

2 groups of principal fiber bundles

Answer 28

Dento-alveolar fiber group – found between tooth and alveolus Dento Gingival (supra-alveolar) group- found in lamina propria of gingiva above alveolar crest

Question 29

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

Answer 29

radiopaque cementum

Question 30

5 types of dento-alveolar fibers

Answer 30

alveolar crest horizontal oblique apical inter-radicular

Question 31

fiber bundles that are found mid-root

Answer 31

horizontal

Question 32

what is the function of horizontal fibers

Answer 32

resist tipping and horizonral movements

Question 33

fiber bundles that are found apical 1/3

Answer 33

oblique

Question 34

what is the most abundant fiber bundle

Answer 34

OBLLQUE!!!

Question 35

fiber bundles that are found apex to fundic bone

Answer 35

apical

Question 36

fiber bundles that are found b/w roots

Answer 36

inter-radicular

Question 37

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

Answer 37

FALSE Fiber bundles DO NOT attach to the alveolar socket (alveolar bone proper) extend from gingiva to cortical bone or cementum

Question 38

functions of dento-gingival fiber groups

Answer 38

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

Question 39

what are the 5 types of dento-gingival fiber groups

Answer 39

circular alveolo-gingival dentogingival dentoperiosteal transeptal

Question 40

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

Answer 40

circular

Question 41

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

Answer 41

alveolo-gingival

Question 42

what fiber group is from CEJ --> AG/FG

Answer 42

dentogingival

Question 43

what fiber group is from CEJ --> cortical palte

Answer 43

dentoperiosteal

Question 44

what fiber group is from CEJ --> another CEJ

Answer 44

transeptal

Question 45

which fiber group prevents mesial distal separation

Answer 45

transeptal

Question 46

what happens to our PDL space as we age

Answer 46

gets skinner and there is a decrease in turnover

Question 47

hypofunction of PDL leads to

Answer 47

decrease in PDL space

Question 48

for ortho, what all is happening on the TENSION SIDE

Answer 48

TENSION SIDE = bone formation via OB increase in remodeling!

Question 49

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

Answer 49

COMPRESSION SIDE = bone resorption via OC