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Oral Histology > Components of the Dentogingival Junction > Flashcards

Components of the Dentogingival Junction Flashcards

1
Q

are both gingivitis and periodontitis reversible?

A

NO! gingivitis is reversible, periodontitis is irreversible

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2
Q

what are the boundaries of the gingiva

A

gingival margin -> mucogingival junction

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3
Q

components of gingiva

A

stratified epithelium and lamina propria

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4
Q

anatomical regions of gingiva

A
  1. marginal/free gingiva
  2. interdental papilla
  3. attached giingiva
  4. alveolar mucosa
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5
Q

what is the border of gingiva that surrounds teeth like a collar

A

outer marginal/free gingiva

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6
Q

what is the gingival wall of the sulcus

A

inner surface of marginal/free gingiva

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7
Q

what contributes to the dentogingival junction

A
  1. oral sulcular epithelium/gingival sulcus
  2. junctional epithelium
  3. oral epithelium of free/marginal gingiva
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8
Q

what region of the gingiva is composed of marginal and attached gingiva

A

interdental papilla

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9
Q

boundaries of alveolar mucosas

A

mucogingival junction to basal part of alveolus

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10
Q

where and when does dentogingival juncton develop

A

clinical eruption from fusiion between oral epithelium and REE

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11
Q

what is the point where oral epithelium and tooth meet

A

dentogingival junction

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12
Q

the DGJ acts as what kind of barrier

A

mechanical, chemical, water, and microbial

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13
Q

stage of eruption:

establish DGJ which includes JE, marginal/free gingiva, and gingval sulcus and tooth surface

A

clinical eruption

also know that this is pre-functiion supra-osseous

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14
Q

stage of eruption:

  1. tooth moves axially into occlusion
  2. the DGJ/JE attached to enamel shifts apically as tooth moves axially
  3. JE becomes attached apically to enamel of clinical crown
A

active eruption (tooth movement exposes more of clinical crown and JE shifts attachment)

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15
Q

stage of eruption:

exposure of anatomical crown as JE recedes and marginal gingiva moves apically

A

passive eruption (epical recession of gingival tissue but no tooth movement)

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16
Q

what may also be pathological and associated with loss of alveolar crest bone?

this is the loss of gingival and PDL fibers and epithelial attachment of JE resulting in exposed root

A

passive eruption aka gingival recession

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17
Q

what type of epithelium is free/marginal gingiva

A

SSPK/SSK from oral epithelium

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18
Q

what type of epithelium is gingival sulcus

A

space lined by SSNK; oral sulcuar epithelium

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19
Q

what type of epithelium is junctional epithelium

A

unique SSNK = epithelium attaches to enamel tooth surface and underlying CT

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20
Q

what is junctional epiithelium derived from

A

REE

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21
Q

what is part of the outer region of marginal/free gingiva?

A
  1. gingival margin/crest
  2. free gingival region
  3. free gingival groove
22
Q

what part of marginal/free gingiva marks the opening of sulcus and is not attached to tooth?
type of epithelium?

A

gingival margin/crest
oral marginal epithelium: SSPK (in slides)/SSK

23
Q

what part of marginal/free gingiva faces the oral cavity and oral vestibule?
type of epithelium?

A

free gingival region
oral epithelium: SSPK (in slides)/SSK

24
Q

what part of marginal/free gingiva is the junction between free and attached gingiva? it theoretically aligns with bottom of sulcus

A

free gingival groove
oral epithelium: SSPK (in slides)/SSK

25
Q

histological features of margina/free gingiva

A
  1. surrounds the circumference of tooth “like a cuff”
  2. forms outer wall of sulcus
  3. relatively impermeable
  4. LONG RETE RIDGES
26
Q

mechanism of attachment for marginal/free gingiva

A

dentogingival fiber group - attaches free gingiva to tooth

27
Q

what is the inner region of the marginal/free gingiva called? type of epithelium?

A

gingival sulcus
sulcular epithelium = SSNK

28
Q

what is the space between marginal gingiva and tooth

A

gingival sulcus

29
Q

histological features of gingival sulcus

A
  1. oral sulcular epithelium - thin SSNK
  2. shallow to absent rete ridges in health
  3. low to semi-permeable to fluid passage
30
Q

what is present in minimal amounts in healthy tissue, and where neutrophil cells may be present?

A

sulcular (crevicular) fluid in gingival sulcus

31
Q

what is the death of the sulcus

A

0.5-3mm (base corresponds to free gingival groove)

32
Q

the floor of the sulcus is continuous with what?

A

juncttional epithelium

33
Q

sulcus depth greater than 3mm may impact what

A

gingival and periodontal integrity

34
Q

what is the apparent increase in sulcus depth due to increase in marginal gingival height

A

gingival pockets (pseudo pockets)

35
Q

what reflects apical migration of JE, loss of JE epithelial attachment apparatus, and loss of dento-gingival PDL fibers due to inflammation?

A

periodontal pocket (true sulcular pocket)

36
Q

conversion of JE to pocket (sulcular epithelium) indicates progression of ___ to ___

A

gingivitis to periodontitis

37
Q

what develops as a remnant of REE

A

JE

38
Q

what encircles the tooth and forms an epithelial seal circumference of tooth at base of sulcus

A

JE

39
Q

what refers to the physical binding of JE to tooth via BM

A

epithelial atttachment

40
Q

what extends from CEJ to base of sulcus, or to interdental col if located interproximal

A

JE

41
Q

what has the highest epithelial turnover rate of basal stem cells?

A

JE (every 3-6 days)

42
Q

what is rapidly restored following instrumentation/surgery/forms around implants

A

JE

43
Q

important histological feature of JE

A

forms an epithelial attachment to tooth

44
Q

what consists of 2-3 layers of SSNK

A

JE

45
Q

describe rete ridges in JE

A

shallow to absent in health

46
Q

are JE highly permeable?

A

YES! in comparison to other gingiival epi, permiting fluid passage into sulcus

47
Q

are the a lot of desmosomes in JE? what does this result?

A

NO. Fewer desmosomes resulting in wide intercellular spaces that contain neutrophils

48
Q

where does fluid exudate originate from in JE? what does the flow reflect?

A

capillaries in LP passes thru JE to sulcus
flow rate reflects degree of inflammation

49
Q

what does junctional epithelium lie between?

A

TWO BASEMENT MEMBRANES!
1. internal basement membrane
2. external basement membrane

50
Q

describe IBM of JE

A

internal basement membrane and hemidesmosomes form attachment apparatus/epithelial attachment

51
Q

describe EBM of JE

A

external basement membrane is where epithelium is attached to underlying LCT. fewer desmosomes are present to allow for more passage of fluid here

Oral Histology (12 decks)

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