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perio exam 1 > lecture 2- perio anatomy 2 (junctional epithelium) > Flashcards

lecture 2- perio anatomy 2 (junctional epithelium) Flashcards

1
Q

after tooth eruption, cells of the oral epithelium possess the ability to differentiate into what?

A

Junctional epithelium

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2
Q

JE (junctional epithelium) is widest in the _____ portion, and thin toward what tooth structure?

A

widest in the coronal portion

thins towards the CEJ

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3
Q

T/F: the junctional epithelium is continuously renewed

A

true

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4
Q

which cell type has a faster turnover rate: the oral epithelium or the junctional epithelium

A

junctional epithelium

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5
Q

what are the dimensions of the JE? from what structure does it originate?

A

only about 1mm long (ranges from .5-1.5)

reduced enamel epithelium (in pre-erupted teeth) gives rise to the JE

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6
Q

when comparing the JE to the OE, which has larger cells? which has larger intercellular spaces? which has more desmosomes?

A

Junctional epithelium- larger cells, larger intercellular space

Oral epithelium- more desmosomes

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7
Q

T/F: JE has the potential to keratinize

A

true

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8
Q

is the JE physically attached to the tooth, or just in contact with it?

A

physically attached

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9
Q

the JE will move _______ in diseased epithelium

A

apically

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10
Q

T/F: the JE if found just apical to the CEJ in children

A

False- found slightly coronal to the CEJ

moves to the level of the CEJ in healthy adults

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11
Q

when does periodontitis occur?

A

when the Junctional epithelium migrates apically down the root surface

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12
Q

what is necessary for pocket formation during periodontitis?

A

viable junctional epithelium

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13
Q

Necrosis of junctional epithelium is seen during what condition?

A

Necrotizing ulcerative periodontitis (NUP)

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14
Q

T/F: as cells die during JE necrosis, a large pocket is formed

A

FALSE

remember- you need viable (living) JE to have pocket formation

no pocket is formed during NUP

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15
Q

what is exposed during NUP (necrotizing ulcerative periodontitis)

A

bone is exposed

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16
Q

what cells are found in the lamina propria layer of the gingival CT?

A
  • fibroblasts
  • mast cells (M)
  • macrophages
  • neutrophilic granulocytes
  • lymphocytes
  • plasma cells
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17
Q

what types of fibers are found in the lamina propria of the gingival CT?

A
  • Collagen
  • reticulin
  • oxytalan
  • elastic fibers
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18
Q

what is the role of reticulin in the lamina propria?

A

surrounds blood vessels

keeps them upright

19
Q

what is the function of elastic fibers in the lamina propria?

A

keep the blood vessels of the CT open

20
Q

what cell types can produce collagen?

A

fibroblasts

cementoblasts

osteoblasts

21
Q

what is the role of gingival fibers?

A
  • reinforce the gingiva
  • provide resilience and tone
  • maintain architectural form and integrity
22
Q

what is the role of circular fibers in the gingiva?

A

encircle the tooth like a cuff

23
Q

_________ fibers fan out from supra-crestal cementum into free gingiva

A

dentogingival fibers

24
Q

where do dentoperiosteal fibers run?

A

run from supracrestal cementum into attached gingiva

25
Q

________ fibers run from tooth to tooth (embedded in cementum)

A

transseptal fibers

26
Q

what are the characteristics of the periodontal ligament?

A
  • richly vascular and cellular connective tissue

- surrounds the roots and joining cementum and alveolar bone

27
Q

where is the periodontal ligament seen in radiographs?

A

the space between the lamina dura (alveolar bone proper) and root surface

(hourglass shape)

28
Q

what is the function of the periodontal lig?

A
  • permits occlusal forces to be distributed

- essential for the tooth mobility

29
Q

what are the 4 fibers of the PDL?

A

Alveolar crest fibers (ACF)

horizontal fibers (HF)

oblique fibers (OF)

apical fibers (APF)

30
Q

what type of cell is found aligned along the principal fibers of the PDL?

A

fibroblasts

31
Q

where are osteoblasts found?

A

lining bone surfaces

32
Q

_________ line cemental surfaces

A

cementoblasts

33
Q

_________ are multinucleated cells that create ruffled surfaces of bone

A

osteoclasts

34
Q

_________ are the remnants of the Hertwig’s epithelial root sheath

A

epithelial rest cells of Mallassez

35
Q

Cementum is similar to bone, but has what key differences?

A
  • no blood vessels
  • no lymph vessels
  • no innervation
  • no physiological resorption/remodeling
36
Q

T/F: cementum is continually deposited throughout life

A

true

37
Q

what is the structural composition of cementum?

A

collagen fibers embedded in an organic matrix

38
Q

what are the 3 classes of cemental fibers?

A
  • intrinsic
  • extrinsic
  • “different forms”
39
Q

what produces intrinsic fibers of the cementum? how are these fibers oriented?

A

produced by cementoblasts

composed of fibers oriented parallel to the root

40
Q

what are extrinsic cemental fibers also known as? what are they produced by?

A
  • AKA “Sharpey’s fibers”

- produced by PDL fibroblasts

41
Q

where is acellular cementum found? cellular cementum?

A

acellular cementum- coronal

cellular- apical

42
Q

osteoblasts of alveolar bone produce a bone matrix (osteoid) consisting of what?

A
  • collagen fibers
  • glycoproteins
  • proteoglycans
43
Q

In Alveolar bone, _______ undergo mineralization by the deposition of minerals

A

osteoids

44
Q

which dental tissue most closely resembles bone?

A

cementum

perio exam 1 (8 decks)

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