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

Ex 2- Periodontium 3- PDL + Alveolar Bone Flashcards

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

A

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

24
Q

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

A

PG’s
GAGs
Glycoproteins (fibronectin)

25
Q

GAGS associated with proteogylcans are important in helping to ______ _______. Important to withstand the ______ ______ of chewing

A

retain H2O

compressive loads

26
Q

Collagen comprises ___-___% of PDL

A

47-52%

27
Q

Ends of collagen fibers that are inserted into mineralized tissue ie cementum (or into bone) are called ______ ______

A

Sharpey’s fibers

28
Q

______ are spherical calcified masses that may be present in the soft connective tissue of the PDL

A

Cementicles

29
Q

________ _______ _______ are the collagen fibers of the PDL that are organized into bundels that function to attach _____ to adjacent _____ _____

A

principal fiber groups
cementum
alveolar bone

30
Q

What are the principal fibers groups?

A 
alveolar crest
horizontal group
oblique group
apical group
interradicular
31
Q

______ ______ are the principal fiber group that connect cementum to crest (top) of alveolar bone

A

Alveolar crest

32
Q

______ ____ are the principal fiber group that connect cementum to alveolar bone below crest

A

Horizontal group

33
Q

______ _____ are the principal fiber group that is most numerous and connects cementum to alveolar bone; suspends tooth in socket

A

Oblique group

34
Q

______ _____ are the principal fiber group that connects the apex of the tooth to alveolar bone socket

A

Apical group

35
Q

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

A

Interradicular

36
Q

The ______ ____ is important for maintaining the integrity of the PDL and supporting the tooth. Not strictly part of PDL

A

gingival ligament

37
Q

What are the components of the gingival ligament?

A 
Transeptal
Circular
Dentogingival 
Dentoperiosteal
Alveologingival
38
Q

________ is a component of the gingival ligament from the cementum of 1 tooth over alveolar crest into the cementum on the adjacent tooth

A

Transeptal

39
Q

_______ is a component of the gingival ligament that circles around the neck of the tooth in lamina propria of free and attached gingiva

A

Circular

40
Q

_______ is a component of the gingival ligament that is the most numerous, from cervical cementum -lamina propria of free and attached gingiva

A

Dentogingival

41
Q

_______ is a component of the gingival ligament from cementum over alveolar crest and inserts into the other side of alveolar bone

A

Dentoperiosteal

42
Q

_______ is a component of the gingival ligament is from the alveolar crest to lamina propria of free & attached gingiva

A

Alveologingival

43
Q

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

A

superior
inferior alveolar
gingival

44
Q

What are the 2 terminal routes taken to supply the PDL?

A
  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
Q

The nerve fibers that innervate the PDL get there by taking _____ route that blood vessels do

A

same

46
Q

The PDL is highly innervated and is innervated by large A_____ fibers and smaller A_____ and ___ fibers

A

beta
delta
C

47
Q

Sensory nerve fibers that supply the PDL signal ________ (A_____) in addition to PAIN information (A delta + C)

A

PROPRIOCEPTIVE (A beta)

48
Q

The PDL proprioceptors provide precise info on the _____ and _____ of force applied to teth

A

levels

direction

49
Q

A ______ fibers are large myelinated fibers, intimately intermingled with collagen fiber bundles, highly sensitive, codes for the ____ of force and ____ of force

A

A beta
amount
direction

50
Q

A beta fibers send info to the ____ to regulate chewing and underlie our ability to localized stimuli applied to teeth (________)

A

CNS

proprioceptors

51
Q

In the _____ direction the cat responded maximally to the force and in the ______ direction the cat responded minimally

A

mesial

distal

52
Q

______ ______ is the bone of the jaw that contains sockets or alveoli for teeth

A

Alveolar process

53
Q

_______ 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)

A

basal

54
Q

What are the 3 parts of the alveolar process?

A
  • outer cortical plate
  • central region of “spongy” or trabecular bone
  • bone lining the socket
55
Q

What are the 3 names of the bone lining the tooth socket?

A 
bundle bone (contains PDL)
cribiform plate (foramina)
Lamina dura (radiographic appearance)
56
Q

The bone lining the socket of teeth develops from the ______ ______

A

dental follicle

Oral Histology (16 decks)

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