Components of the Dentogingival Junction Flashcards
are both gingivitis and periodontitis reversible?
NO! gingivitis is reversible, periodontitis is irreversible
what are the boundaries of the gingiva
gingival margin -> mucogingival junction
components of gingiva
stratified epithelium and lamina propria
anatomical regions of gingiva
- marginal/free gingiva
- interdental papilla
- attached giingiva
- alveolar mucosa
what is the border of gingiva that surrounds teeth like a collar
outer marginal/free gingiva
what is the gingival wall of the sulcus
inner surface of marginal/free gingiva
what contributes to the dentogingival junction
- oral sulcular epithelium/gingival sulcus
- junctional epithelium
- oral epithelium of free/marginal gingiva
what region of the gingiva is composed of marginal and attached gingiva
interdental papilla
boundaries of alveolar mucosas
mucogingival junction to basal part of alveolus
where and when does dentogingival juncton develop
clinical eruption from fusiion between oral epithelium and REE
what is the point where oral epithelium and tooth meet
dentogingival junction
the DGJ acts as what kind of barrier
mechanical, chemical, water, and microbial
stage of eruption:
establish DGJ which includes JE, marginal/free gingiva, and gingval sulcus and tooth surface
clinical eruption
also know that this is pre-functiion supra-osseous
stage of eruption:
- tooth moves axially into occlusion
- the DGJ/JE attached to enamel shifts apically as tooth moves axially
- JE becomes attached apically to enamel of clinical crown
active eruption (tooth movement exposes more of clinical crown and JE shifts attachment)
stage of eruption:
exposure of anatomical crown as JE recedes and marginal gingiva moves apically
passive eruption (epical recession of gingival tissue but no tooth movement)
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
passive eruption aka gingival recession
what type of epithelium is free/marginal gingiva
SSPK/SSK from oral epithelium
what type of epithelium is gingival sulcus
space lined by SSNK; oral sulcuar epithelium
what type of epithelium is junctional epithelium
unique SSNK = epithelium attaches to enamel tooth surface and underlying CT
what is junctional epiithelium derived from
REE
what is part of the outer region of marginal/free gingiva?
- gingival margin/crest
- free gingival region
- free gingival groove
what part of marginal/free gingiva marks the opening of sulcus and is not attached to tooth?
type of epithelium?
gingival margin/crest
oral marginal epithelium: SSPK (in slides)/SSK
what part of marginal/free gingiva faces the oral cavity and oral vestibule?
type of epithelium?
free gingival region
oral epithelium: SSPK (in slides)/SSK
what part of marginal/free gingiva is the junction between free and attached gingiva? it theoretically aligns with bottom of sulcus
free gingival groove
oral epithelium: SSPK (in slides)/SSK
histological features of margina/free gingiva
- surrounds the circumference of tooth “like a cuff”
- forms outer wall of sulcus
- relatively impermeable
- LONG RETE RIDGES
mechanism of attachment for marginal/free gingiva
dentogingival fiber group - attaches free gingiva to tooth
what is the inner region of the marginal/free gingiva called? type of epithelium?
gingival sulcus
sulcular epithelium = SSNK
what is the space between marginal gingiva and tooth
gingival sulcus
histological features of gingival sulcus
- oral sulcular epithelium - thin SSNK
- shallow to absent rete ridges in health
- low to semi-permeable to fluid passage
what is present in minimal amounts in healthy tissue, and where neutrophil cells may be present?
sulcular (crevicular) fluid in gingival sulcus
what is the death of the sulcus
0.5-3mm (base corresponds to free gingival groove)
the floor of the sulcus is continuous with what?
juncttional epithelium
sulcus depth greater than 3mm may impact what
gingival and periodontal integrity
what is the apparent increase in sulcus depth due to increase in marginal gingival height
gingival pockets (pseudo pockets)
what reflects apical migration of JE, loss of JE epithelial attachment apparatus, and loss of dento-gingival PDL fibers due to inflammation?
periodontal pocket (true sulcular pocket)
conversion of JE to pocket (sulcular epithelium) indicates progression of ___ to ___
gingivitis to periodontitis
what develops as a remnant of REE
JE
what encircles the tooth and forms an epithelial seal circumference of tooth at base of sulcus
JE
what refers to the physical binding of JE to tooth via BM
epithelial atttachment
what extends from CEJ to base of sulcus, or to interdental col if located interproximal
JE
what has the highest epithelial turnover rate of basal stem cells?
JE (every 3-6 days)
what is rapidly restored following instrumentation/surgery/forms around implants
JE
important histological feature of JE
forms an epithelial attachment to tooth
what consists of 2-3 layers of SSNK
JE
describe rete ridges in JE
shallow to absent in health
are JE highly permeable?
YES! in comparison to other gingiival epi, permiting fluid passage into sulcus
are the a lot of desmosomes in JE? what does this result?
NO. Fewer desmosomes resulting in wide intercellular spaces that contain neutrophils
where does fluid exudate originate from in JE? what does the flow reflect?
capillaries in LP passes thru JE to sulcus
flow rate reflects degree of inflammation
what does junctional epithelium lie between?
TWO BASEMENT MEMBRANES!
1. internal basement membrane
2. external basement membrane
describe IBM of JE
internal basement membrane and hemidesmosomes form attachment apparatus/epithelial attachment
describe EBM of JE
external basement membrane is where epithelium is attached to underlying LCT. fewer desmosomes are present to allow for more passage of fluid here
