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PERIO > Lecture 2 questions > Flashcards

Lecture 2 questions Flashcards

1
Q

What does the shape of interdental papilla depend on?

A

the contact relationships between adjacent teeth, m width of approximate tooth surfaces, course of CEJ

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2
Q

what is the col region?

A

concave, non-keratinized epithelium on the contact of 2 teeth, created susceptibility for perio disease, best to check for it in molar area. we have to wedge b/c any crap left behind while operating can cause perio disease

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3
Q

What is the golden rule?

A

the papilla is complete when it reaches 5 mm from the crest of the bone

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4
Q

When does supra eruption happen?

A

with older age 40+

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5
Q

What is the oral epithelium?

A

keratinized, stratified, squamous epithelium

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6
Q

What are the 4 layers of the oral epithelium?

A

basal (stratum basale), prickle (stratum spinosum), granular (stratum granulosum), and keratinized cell layer (stratum corneum).

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7
Q

Are there blood vessels in epithelium?

A

no

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8
Q

what do desmosomes in the basal layer do?

A

diffuse nutrients

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9
Q

Which layer of the oral epithelium is the only one capable of replication or division?

A

stratum basale

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10
Q

What are the cells in the oral epithelium?

A

keratinocytes (90%), melanocyes, langerhans (defense), and Merkel (sensory)

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11
Q

Where is the basement membrane and what does it contain?

A

located between basal layer and CT and contains glycoproteins (that collect fluid for hydration) and protein-polysaccharide complexes

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12
Q

What are the layers of the basement membrane?

A

lamina lucida (adjacent to basal cells) and lamina densa (adjacent to CT). There are anchoring collagen fibers projecting from LD into CT

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13
Q

What are hemidesmosomes?

A

dense plaques that attach the epithelium to the basement membrane

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14
Q

When epithelial ridges/rete pegs fuse in oral epithelium and CT, what is seen?

A

stippling, which is usually seen in thick biotype

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15
Q

Where does junctional epithelium come from?

A
  • during tooth eruption: from reduced dental epithelium

- after tooth eruption: cells of OR differentiate into cells of JE where it has faster turnover and regeneration than OE

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16
Q

Where is the JE widest and thinnest?

A

widest in coronal and thinnest toward CEJ

17
Q

differences between JE and OE?

A
  • size of the cells: JE>OE (b/c JE is metabolically active)
  • size of intercellular space: JE>OE (bc theres a lot of diffusion we need a lot of neutrophils to come out in this space and clean plaque, etc on teeth)
  • number of desmosomes: JE
18
Q

Where is necrosis of JE seen?

A
  • necrotizing ulcerative periodontitis (bone is exposed)
19
Q

What are the cells in the lamina propria?

A
  • fibroblast (make matrix and fibers)
  • mast cells (vasoactive substances)
  • macrophages (phagocytosis and synthesis)
  • neutrophilic granulocytes
  • lymphocytes
  • plasma cells
20
Q

What are the fibers in lamina propria?

A

collagen (most abundant), reticulin (BM and around vessels), oxytalan (in PDL), elastic (around vessels)

21
Q

What do gingival fibers do?

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

What are the types of gingival fibers?

A

circular (only ones not connected to cementum), dentogingival, dentoperiosteal, transseptal

23
Q

What are the types of the PDL fibers?

A

alveolar crest fibers, horizontal fibers, oblique fibers, apical fibers

24
Q

What are the cells of the PDL?

A

fibroblasts, osteoblasts, osteoclasts, cementoblasts, epi cells, nerve fibers, epithelium cell rests of Mallassez, remnants of HERS

25
Q

cementum is similar to bone but it has no…?

A

blood vessels, lymph vessels, innervation, physiological resorption/remodeling

26
Q

What makes intrinsic cemental fibers?

A

cementoblasts

27
Q

What makes up extrinsic cemental fibers?

A

sharpey’s fibers, which are produced by PDL fibroblasts

28
Q

What are the different forms of cemental fibers?

A

acellular extrinsic, cellular mixed stratified, cellular intrinsic

PERIO (10 decks)

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