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
