EX2; Periodontium - PDL and Alveolar Bone Flashcards Preview

May14 Oral Histology > EX2; Periodontium - PDL and Alveolar Bone > Flashcards

Flashcards in EX2; Periodontium - PDL and Alveolar Bone Deck (50)
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1

This is a soft connective tissue between the cementum and the bony wall of the tooth socket

PDL

2

What are the major components of the PDL

its large highly organized bundles of collagen fibers that have their ends embedded in the cementum and bone

3

What is the critical function of the PDL

attachment of the tooth to the bone

4

What is the thickness of the PDL

.2-.4; very thin and thins with age

5

What are the cells of the PDL

fibroblasts; most numerous
cementoblasts
osteoblasts
osteoclasts
Epithelial rests of Mallaez
immune cells
undifferentiated mesenchymal (stem) cells

6

These are large cells that secrete and degrade collagen, and are highly active (a measure of size)

fibroblasts

7

What type of cell-cell junctions do the fibroblasts contain

desmosomes
gap junctions; synchronize collagen secretion
cell-ECM junctions

8

This is one type of cell-ECM junction; fibronectin forms part of this junction

fibronexus

9

The cell-ECM junction is the functional link between what

occlusal forces and fibroblasts
allowing the fibroblast to react to those forces (including, secreting and degrading collagen, etc.)

10

The cell-ECM junction helps to maintain orientation of what

fibroblasts in PDL thus affecting orientation of collagen fiber bundles

11

The cell-ECM junction has links to what component

the actin skeleton and ultimately interacts with the collagen in the ECM

12

Where would you find the cementoblasts, osetoblasts, and osteoclasts in the PDL

near the tissue they are involved with
cementoblasts = cementum
osteoclast/blast = bone

13

What distinguished osteoclasts from the other adjacent cells

multiple nuclei

14

When would resorption of the cementum occur

in special situations like shedding of deciduous dentition or trauma
although small regions of cementum respiration is not unusual

15

These are remnants of HERS present in the PDL, lying closer to the cementum in clusters

Epithelial rests of Mallasez

16

What is the function of the Epithelial rests of Mallasez

unknown function; but an proliferate and form cysts

17

These cells lie close to the blood vessels and give rise to new cells, and contribute to maintaining the viability of the periodontium

undifferentiated mesenchymal cells (stem)

18

What are the fibers of the ECM of the PDL

collagen types I (80) and III (20) (also XII)
oxytalin

19

What are the ground substances of the ECM of the PDL; important in withstanding compressive loads

PGs and assocaited GAGs (water retention)
glycoproteins = fibronectin

20

Collagen forms what percentage of the PDL

47-52%

21

These are immature elastic fibers that tend to run at right angles to the collagen fiber bundles

oxytalin fibers

22

These are the ends of the collagen fibers that are inserted into mineralized tissue

Sharpey's fibers

23

This is a spherical calcified mass in the PDL

cementicles

24

These are the collagen fibers of the PDL that are organized into bundles that function to attach cementum to the adjacent alveolar bone

principal fiber groups

25

What are the principal fiber groups

alveolar crest
horizontal group
oblique group
apical group
interradicular

26

This principal fiber group connects cementum to crest (top) of alveolar bone

alveolar crest

27

This principal fiber group connects cementum to alveolar bone below the crest

horizontal group

28

This principal fiber group is most numerous and connects cementum to alveolar bone; suspends tooth in socket

oblique group

29

This principal fiber group connects the apex of the tooth to alveolar bone socket

apical group

30

This principal fiber group is only in multi rooted teeth; between the cementum and interradicular septum of the alveolar bone

interradicular