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AU14 Periodontology > Exam 1; Junctional Epithelium > Flashcards

Exam 1; Junctional Epithelium Flashcards

1
Q

Where does the junctional epithelium originate from during and after tooth eruption

A 
during = reduced dental epithelium
after = the cells of the oral (sulcular) epithelium possess the ability to differentiate into the cells of the JE
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2
Q

Where is the JE widest?

A

in the coronal portion (15-20 cell layers)

thin towards the CEJ (3-4 cells)

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3
Q

Where is the JE located

A

at or just below the CEJ

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4
Q

What is the relative size of the cells and interstitial space of the JE compared to the OE

A

relatively large

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5
Q

What is the number of desmosomes of the JE compared to the OE

A

JE < OE

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6
Q

True or False

JE has the potential to keratinize

A

True

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7
Q

True or False

JE is physically attached to the tooth, not simply in contact with it

A

True

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8
Q

Apical movement of junctional epithelium in health and disease changes how

A

loses attachment position, not attachment itself

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9
Q

This occurs when the junctional epithelium migrates apically down root surface

A

periodontitis

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10
Q

This is necessary for pocket formation

A

viable junctional epithelium

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11
Q

Necrosis of JE is seen in what (the cells die)

A

necrotizing ulcerative periodontitis

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12
Q

What are the 6 cells that compose the gingival lamina propria

A 
fibroblasts
mast cells
macrophages
neutrophilic granulocytes
lymphocytes
plasma cells
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13
Q

What are the four fibers of the lamina propria

A

collagen
reticulin
oxytalan
elastic

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14
Q

This fiber has characteristic cross-bonding, the most abundant, and is produced by fibroblasts, cementoblasts, and osteoblast

A

collagen

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15
Q

This fiber is numerous adjacent to basement membrane and around blood vessels

A

reticulin

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16
Q

This fiber is mostly in the PDL and runs parallel to the long axis of the tooth

A

oxytalan

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17
Q

This fiber is mostly around blood vessels

A

elastic

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18
Q

These reinforce the gingiva, provide resilience and tone, and maintain the architectural form and integrity

A

gingival fibers

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19
Q

What are the four gingival fibers

A

circular fibers
dentogingival
dentoperiosteal
transeptal

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20
Q

This gingival fiber encircles the tooth like a cuff

A

circular fibers

21
Q

This gingival fiber fans out from supra-crestal cementum onto free gingiva

A

dentogingival fibers

22
Q

This gingival fiber runs from supracrestal cementum into attached gingiva

A

dentoperiosteal fibers

23
Q

This gingival fiber runs from tooth to tooth (embedded in cementum)

A

transeptal

24
Q

This is richly vascular and cellular CT surrounding the roots and joining cementum and alveolar bone

A

periodontal ligament

25
Q

How is the PDL depicted radiographically

A

the space between lamina dura and root surface

26
Q

What is width of the PDL

A

0.25mm

27
Q

What is the function of the PDL

A

permits forces to be distributed

essential for tooth mobility

28
Q

These cells of the PDL are aligned along the principal fibers

A

fibroblasts

29
Q

These cells of the PDL line the bone surface

A

osteoblasts

30
Q

These cells of the PDL line the cemental surface

A

cementoblasts

31
Q

These cells of the PDL are multinucleate and create a ruffled surface of bone epithelial cells

A

osteoclasts

32
Q

These are remnants of the Hertwig’s epithelial root sheath

A

epithelial rests of Mallassez

33
Q

This is the mineralized tissue covering root surface and occasionally, small portions of the crown of the teeth

A

cementum

34
Q

What are the four differences between cementum and bone

A

no blood vessels
no lymph vessles
no innervation
no physiologic resorption/remodeling

35
Q

What three things characterize cementum

A

continuing deposition throughout life
collagen fibers embedded in organic matrix
high mineral content (65%); mainly HA

36
Q

These cemental fibers are produced by cementoblasts; composed of fibers oriented parallel to root

A

intrinsic

37
Q

These cemental fibers are also known as Sharpey’s fibers and are produced by PDL fibers

A

extrinsic

38
Q

These cemental fibers are located coronal or the middle portion of the root

A

acellular, extrinsic fiber cementum

39
Q

These cemental fibers are in the apical third of the root and in furcation

A

cellular, mixed stratified cementum

40
Q

These cemental fibers in resorption lacunae

A

cellular, intrinsic fiber cementum

41
Q

Cementum thickness increases when

A

gradually throughout life
cervical portion = 20-30µm
apical portion = 150-250µm

42
Q

Alveolar bone consists of bone formed by what sources

A

cells from the dental follicle

cells independently of tooth development

43
Q

In alveolar bone, the osteoblasts produce what

A

bone matrix (osteoid) consisting of collagen fibers, glycoproteins, and proteoglycans

44
Q

In alveolar bone, osteoid undergoes what

A

mineralization by the deposition of minerals (calcium and phosphate)

45
Q

What vessels supply the gingiva

A

supraperiosteal vessels

46
Q

What vessels supply the periodontal tisssues

A

dental artery
superior/inferior alveolar
intraseptal

47
Q

What are the four lymph nodes associated with the gingiva/PD tissues

A

submental
deep cervical
submandibular
jugulodigastric

48
Q

What are some nerves of the periodontium

A

end branches of the trigeminal

AU14 Periodontology (29 decks)

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