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Oral Histology > Ex 2- Periodontium 3- PDL + Alveolar Bone > Flashcards

Ex 2- Periodontium 3- PDL + Alveolar Bone Flashcards

(56 cards)

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1
Q

_____ is the soft connective tissue btw cementum and the bony wall of the tooth socket continuous with gingival connective tissue cervical and apical foramen apically

A

PDL

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2
Q

The major components of the PDL are its large, highly organized bundles of _____ fibers that have their ends embedded in ________ and _____

A

collagen
cementum
bone

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3
Q

The PDL has the critical function of attaching _____ to _____

A

tooth to bone

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4
Q

The PDL is very ________ and gets slightly _______ with age

A

thin (.2-.4mm)

thinner

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5
Q

What are the cells of the periodontal ligament (PDL)?

A 
fibroblasts
cementoblasts
osteoblasts + osteoclasts
epithelial rests of Mallasez
immune cells
undifferentiated mesenchymal cells (stem cells)
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6
Q

_______ are the most numerous cells of the PDL

A

fibroblasts

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7
Q

Fibroblasts are large cells (size indicates activity) that secrete + degrade ______

A

collagen

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8
Q

PDL fibroblasts have a variety of cell-to-cell contacts including ______, _____ ____, and _____-______ junctions

A

desmosomes
gap junctions
cell-ECM

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9
Q

______ _____ synchronized collagen secretion

A

gap junctions

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10
Q

Fibroblasts exhibit junctions w/ ECM, one type is called a _____ because the extracellular matrix molecule fibronectin forms part of this junction

A

fibronexus

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11
Q

Fibroblasts are most prominent in the ______ part of the periodontal ligament. Cementoblasts at the _______/PDL border. Osteoblasts + osteoclasts near _____

A

central
cementum
bone

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12
Q

The cell-ECM junction is the functional link between ______ ______ and _____. Allowing the fibroblast to react to the forces (ie secreting and degrading ______)

A

occlusal forces
fibroblasts
collagen

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13
Q

The cell-ECM junction helps to maintain the orientation of _____ in PDL thus affecting orientation of _______ _____ _____

A

fibroblasts

collagen fiber bundles

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14
Q

Cell (fibroblast)-ECM juncion have links to ____ cytoskeleton that ultimately interact with ______ in the ECM through either single _______ molecule or complex of molecules

A

actin
collagen
transmembrane

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15
Q

Cementoblasts, osteoblasts, osteoclasts are all located where in the PDL?

A

closest to the tissue they form

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16
Q

Osteoclasts can be distinguished from adjacent cells by the presence of _______ _____

A

multiple nuclei

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17
Q

_______ are rare in the PDL

A

cementoclasts

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18
Q

Cementum is NOT undergoing _______ remodeling like bone or the PDL but cementum is resistant to _______

A

constant

resorption

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19
Q

Notable resorption of cementum occurs in SPECIAL SITUATIONS like shedding of the ______ _____ or ____

A

deciduous

trauma

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20
Q

______ ____ ___ ______ are remnants of HERS present in the PDL. They are epithelial cells that lie in clusters closer to the cementum than alveolar bone

A

Epithelial rests of Mallasez

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21
Q

Epithelial rests of Mallasez have _____ functions in mature teeth but when the PDL is inflamed, rest cells proliferate and form _____

A

unknown

cysts

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22
Q

________ ________ cells lie close to blood vessels, are though to be a ______ stem cell that give rise to new fibroblasts, cementoblasts + osteoblasts

A 
undifferentiated mesenchymal (stem)
pluripotent
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23
Q

The fibers of the ECM of the PDL consist of particularly well organized ____ fibers bundles Type ___ and ___. Immature elastic fibers;______ _____ also found at ______ angles to the collagen fiber bundles

Study These Flashcards
A

collagen
I (80) and III(20)
oxytalin
right

24
Q

The ground substances of the ECM of the PDL are _______ , _______ and _____

Study These Flashcards
A

PG’s
GAGs
Glycoproteins (fibronectin)

25
GAGS associated with proteogylcans are important in helping to ______ _______. Important to withstand the ______ ______ of chewing
retain H2O | compressive loads
26
Collagen comprises ___-___% of PDL
47-52%
27
Ends of collagen fibers that are inserted into mineralized tissue ie cementum (or into bone) are called ______ ______
Sharpey's fibers
28
______ are spherical calcified masses that may be present in the soft connective tissue of the PDL
Cementicles
29
________ _______ _______ are the collagen fibers of the PDL that are organized into bundels that function to attach _____ to adjacent _____ _____
principal fiber groups cementum alveolar bone
30
What are the principal fibers groups?
``` alveolar crest horizontal group oblique group apical group interradicular ```
31
______ ______ are the principal fiber group that connect cementum to crest (top) of alveolar bone
Alveolar crest
32
______ ____ are the principal fiber group that connect cementum to alveolar bone below crest
Horizontal group
33
______ _____ are the principal fiber group that is most numerous and connects cementum to alveolar bone; suspends tooth in socket
Oblique group
34
______ _____ are the principal fiber group that connects the apex of the tooth to alveolar bone socket
Apical group
35
_______ is the principal fiber group that is only in multi-rooted teeth; between cementum and interradicular septum of alveolar bone
Interradicular
36
The ______ ____ is important for maintaining the integrity of the PDL and supporting the tooth. Not strictly part of PDL
gingival ligament
37
What are the components of the gingival ligament?
``` Transeptal Circular Dentogingival Dentoperiosteal Alveologingival ```
38
________ is a component of the gingival ligament from the cementum of 1 tooth over alveolar crest into the cementum on the adjacent tooth
Transeptal
39
_______ is a component of the gingival ligament that circles around the neck of the tooth in lamina propria of free and attached gingiva
Circular
40
_______ is a component of the gingival ligament that is the most numerous, from cervical cementum -lamina propria of free and attached gingiva
Dentogingival
41
_______ is a component of the gingival ligament from cementum over alveolar crest and inserts into the other side of alveolar bone
Dentoperiosteal
42
_______ is a component of the gingival ligament is from the alveolar crest to lamina propria of free & attached gingiva
Alveologingival
43
The PDL has a profuse vascular supply. The main vascular supply comes from the _______ and ________ ______ arteries. There is also a contibution from _______ arteries at the coronal part of PDL
superior inferior alveolar gingival
44
What are the 2 terminal routes taken to supply the PDL?
1. Enter alveolar bone + then pierce foramina wall of bony socket (perforating arteries, main supply) 2. Branch near apical foramen + directly enter PDL (accessory)
45
The nerve fibers that innervate the PDL get there by taking _____ route that blood vessels do
same
46
The PDL is highly innervated and is innervated by large A_____ fibers and smaller A_____ and ___ fibers
beta delta C
47
Sensory nerve fibers that supply the PDL signal ________ (A_____) in addition to PAIN information (A delta + C)
PROPRIOCEPTIVE (A beta)
48
The PDL proprioceptors provide precise info on the _____ and _____ of force applied to teth
levels | direction
49
A ______ fibers are large myelinated fibers, intimately intermingled with collagen fiber bundles, highly sensitive, codes for the ____ of force and ____ of force
A beta amount direction
50
A beta fibers send info to the ____ to regulate chewing and underlie our ability to localized stimuli applied to teeth (________)
CNS | proprioceptors
51
In the _____ direction the cat responded maximally to the force and in the ______ direction the cat responded minimally
mesial | distal
52
______ ______ is the bone of the jaw that contains sockets or alveoli for teeth
Alveolar process
53
_______ bone is the apical dividing line btw the alveolar process and thebody of the maxilla or mandible that is just apical to the roots of the teeth (alveolar process)
basal
54
What are the 3 parts of the alveolar process?
- outer cortical plate - central region of "spongy" or trabecular bone - bone lining the socket
55
What are the 3 names of the bone lining the tooth socket?
``` bundle bone (contains PDL) cribiform plate (foramina) Lamina dura (radiographic appearance) ```
56
The bone lining the socket of teeth develops from the ______ ______
dental follicle

Oral Histology (16 decks)

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