Components of the Dentogingival Junction

Question 1

are both gingivitis and periodontitis reversible?

Answer 1

NO! gingivitis is reversible, periodontitis is irreversible

Question 2

what are the boundaries of the gingiva

Answer 2

gingival margin -> mucogingival junction

Question 3

components of gingiva

Answer 3

stratified epithelium and lamina propria

Question 4

anatomical regions of gingiva

Answer 4

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

Question 5

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

Answer 5

outer marginal/free gingiva

Question 6

what is the gingival wall of the sulcus

Answer 6

inner surface of marginal/free gingiva

Question 7

what contributes to the dentogingival junction

Answer 7

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

Question 8

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

Answer 8

interdental papilla

Question 9

boundaries of alveolar mucosas

Answer 9

mucogingival junction to basal part of alveolus

Question 10

where and when does dentogingival juncton develop

Answer 10

clinical eruption from fusiion between oral epithelium and REE

Question 11

what is the point where oral epithelium and tooth meet

Answer 11

dentogingival junction

Question 12

the DGJ acts as what kind of barrier

Answer 12

mechanical, chemical, water, and microbial

Question 13

stage of eruption:

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

Answer 13

clinical eruption

also know that this is pre-functiion supra-osseous

Question 14

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

Answer 14

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

Question 15

stage of eruption:

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

Answer 15

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

Question 16

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

Answer 16

passive eruption aka gingival recession

Question 17

what type of epithelium is free/marginal gingiva

Answer 17

SSPK/SSK from oral epithelium

Question 18

what type of epithelium is gingival sulcus

Answer 18

space lined by SSNK; oral sulcuar epithelium

Question 19

what type of epithelium is junctional epithelium

Answer 19

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

Question 20

what is junctional epiithelium derived from

Answer 20

REE

Question 21

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

Answer 21

1. gingival margin/crest
2. free gingival region
3. free gingival groove

Question 22

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

Answer 22

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

Question 23

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

Answer 23

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

Question 24

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

Answer 24

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

Question 25

histological features of margina/free gingiva

Answer 25

1. surrounds the circumference of tooth "like a cuff" 2. forms outer wall of sulcus 3. relatively impermeable 4. LONG RETE RIDGES

Question 26

mechanism of attachment for marginal/free gingiva

Answer 26

dentogingival fiber group - attaches free gingiva to tooth

Question 27

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

Answer 27

gingival sulcus sulcular epithelium = SSNK

Question 28

what is the space between marginal gingiva and tooth

Answer 28

gingival sulcus

Question 29

histological features of gingival sulcus

Answer 29

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

Question 30

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

Answer 30

sulcular (crevicular) fluid in gingival sulcus

Question 31

what is the death of the sulcus

Answer 31

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

Question 32

the floor of the sulcus is continuous with what?

Answer 32

juncttional epithelium

Question 33

sulcus depth greater than 3mm may impact what

Answer 33

gingival and periodontal integrity

Question 34

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

Answer 34

gingival pockets (pseudo pockets)

Question 35

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

Answer 35

periodontal pocket (true sulcular pocket)

Question 36

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

Answer 36

gingivitis to periodontitis

Question 37

what develops as a remnant of REE

Answer 37

JE

Question 38

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

Answer 38

JE

Question 39

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

Answer 39

epithelial atttachment

Question 40

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

Answer 40

JE

Question 41

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

Answer 41

JE (every 3-6 days)

Question 42

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

Answer 42

JE

Question 43

important histological feature of JE

Answer 43

forms an epithelial attachment to tooth

Question 44

what consists of 2-3 layers of SSNK

Answer 44

JE

Question 45

describe rete ridges in JE

Answer 45

shallow to absent in health

Question 46

are JE highly permeable?

Answer 46

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

Question 47

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

Answer 47

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

Question 48

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

Answer 48

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

Question 49

what does junctional epithelium lie between?

Answer 49

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

Question 50

describe IBM of JE

Answer 50

internal basement membrane and hemidesmosomes form attachment apparatus/epithelial attachment

Question 51

describe EBM of JE

Answer 51

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