Microscopic anatomy of the periodontium

42 terms by rachel_dunn12 

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Connective tissue

supplies nutrients and blood

Epithelium

outer surface of body
seamless

Keratinized Tissue

protectioin against injury and invasion
palms of hands and soles of feet
strong and waterproof
no nuclei

Basal lamina

thin mat of extracellular matrix

Mucosa

stratisfied squamous, lots of cells and layers, flat

Non-keratinized tissue

nuclei
fatter cells
cushion for stress and wear

Desmosome

cell to cell junction

Hemidesmosome

cell to basal lamina junction

Crevicular fluid

health-little bit
disease-lots for defense
from connective tissue to sulcular epithelium

Junction Epithelium

nonkeratinized, thin, smooth interface

Connective tissue

nurish epithelium
fill spaces between tissues and organs of the body
no voids
cells are sparse-macrophages, neutrophils, extracellular matrix, fibroblasts, collegan fibers, capillaries

Enamel

Only oral tissue that does not contain connective tissue (rods)

Retention

scalloping between epithelium and connective tissue
increase adhesion by increasing surface area

Rete pegs

epithelial ridges

Connective tissue papillae

connective tissue projections

Oral epithelium

para or keratinized protection
crest of GM to MGJ
wavy interface with connective tissue

Sulcular epithelium

nonkeratinized
permeable
bleeding in unhealthy, ulcerations

Internal basal lamina

connects JE to tooth
hemidesmosome
most hemidesmosomes are coronal

External basal lamina

connects JE to connective tissue
hemidesmosome
barrier to biofilm and connective tissue

Junctional epithelium

seals off bacteria
plentiful cells, connected to each other
desmosomes
nonkeratinized
nuclei

Gingival connective tissue

solidity, attaches gingiva to cementum and bone
AKA lamina propria
5% fibroblasts and immune cells
55-65% extracellular matrix
30-35% gel like material

Alveologingival

bone to gingiva

Circular

around the tooth

Dentogingival

dentin to gingiva

Periostogingival

periosteum to gingiva

Intergingival

gingiva to gingiva

Transeptal

septum of bone to septum of bone

Biologic width

tooth surface covered by JE and fiber bundles above crest of bone
1 mm of JE and 1 mm of fiber bundles
about 2 mm total
always maintained, even if bone resorption is necessary

PDL

support, sensory, nutritive, formative, resorptive
fibroblasts, cemento/osteoblasts, extracellular matrix, rich nerve and blood supply
.05-.25 mm thickness

Alveolar crest

bone to cementum

Horizontal

bone to cementum horizontally

Interradicular

between bifurcated roots

Oblique

apical towards root
bone to cementum

Apical

apex of the tooth

Cementum

calcified layer of connective tissue that covers the tooth root
seals dentinal tubules
attaches PDL fibers to tooth
compensates for occlusal wear, forms more at the apex
organic matrix, mineralized portion-hydroxyapatite
no blood or nerve supply

Dentinal tubules

sensory

Acellular cementum

no cementocytes, cervical 1/3-1/2 of the root
no new cementum
removed with instrumentation
30-60 um thick

Cellular cementum

near apex
deposited through life
150-200 um thick

Overlap

cementum on enamel 60%

Meet

cementum meets enamel at CEJ 30%

Gap

gap between cementum andn enamel 10%, sensitivity

Alveolar Bone

mineralized connective tissue
ridgid
vascular and innervated, lymph
periods of formation/resorption
extracellular matrix

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