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Oral Bio 2 > Quiz 2 > Flashcards

Quiz 2 Flashcards

1
Q

Which has the most cells: enamel, dentin, pulp?

A

Pulp

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2
Q

How much % of dentin is “inorganic” material?

A

70%

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3
Q

How much % of dentin is “organic” material?

A

20%

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4
Q

How much of dentin is water?

A

10%

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5
Q

What is intertwined around the dentinal tubules?

A

Collagen fibers (banded)

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6
Q

What does mineralized dentin versus un-mineralized dentin look like?

A

Un-mineralized dentin looks like a lot of circular fibers, no structure.
Mineralized looks like solid dentin tubules

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7
Q

What main type of collagen is in Dentin?

A

Type I Collagen

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8
Q

What’s the purpose of the collagen in dentin?

A

It’s the fiber scaffold for HA crystals

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9
Q

What’s the purpose of the non-collagenous protein in dentin?

A

helps with laying down mineral, and making sure it’s happening in the right places.

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10
Q

What are the “main 2” proteins found in dentin?

A 
Dentin Matrix Protein 1 (mineralizes dentin)
Dentin SialoPhosphoProtein (3 more parts)
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11
Q

What does DSPP further cleave into?

A
  1. Dentin SialoProtein (DSP)
  2. Dentin PhosphoProtein (DPP)
  3. Dentin GlycoProtein (DG)
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12
Q

Are the proteins found in Dentin also found in bone?

A

YES!! in a smaller amount.

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13
Q

Where is DSP found and what does it do?

A

It’s in the tubules, and it doesn’t allow mineral to build up in the initial phase.

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14
Q

What does DGP do?

A

It helps with the mineralization (but somewhat unknown)

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15
Q

What does DPP do?

A

It helps with crystal formation

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16
Q

What could a defect in DSPP cause?

A

dentinogenesis imperfecta Types 2/3

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17
Q

What happens to the pulp with dentinogenesis imperfecta type 1-2?

A

The pulp gets filled with abnormal dentin

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18
Q

What happens with dentinogenesis imperfecta type 3?

A

large pulp chambers,hypomineralizeation (Dspp didn’t work)

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19
Q

What cell makes dentin?

A

Odontoblasts

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20
Q

How long are enamel crystals?

A

May run the entire length of the enamel (in the millimeters)

21
Q

What are the 4 enamel proteins?

A

Amelogenins
ameloblastins
enamelin
tuftelin

22
Q

What are the two rod sheath proteins?

A

Ameloblastins and Amelogenins

23
Q

How much mineral is enamel initiallY?

A

30%

24
Q

What forms first interrod or rod sheath?

A

Interrod enamel?

25
Q

What do ruffled cells do to enamel?

A

Pumps in Calcium into crystals

26
Q

What do smooth cells do to enamel?

A

Vacuums protein out of enamel crystals

27
Q

How long do ameloblasts stay in ruffled stage?

A

80% of it’s life

28
Q

What is nasmyths membrane?

A

debris forming a membrane on the crown after eruption

29
Q

What do amelogenins do?

A

helps enamel grow tall and restricts lateral growth

30
Q

What do ameloblastins do?

A

they are glue to hold the enamel rods together as they grow (otherwise it falls off)

31
Q

What’s the Striae of Retzius?

A

“rings on a tree” (Rhett loves trees…and peri-Kylie)

32
Q

What’s the neonatal line?

A

shows when birth happened.

33
Q

Whats the perikymata?

A

the surface showing of striae of retzius

34
Q

What are cross striations?

A

4microns per day of enamel growth

35
Q

What are bands of hunter schreger?

A

different light scattering in enamel ground sections.

36
Q

What are enamel tufts?

A

look like ‘‘tufts of grass” in enamel.

Hypocalcified, 1/2 into the enamel.

37
Q

What are enamel lamellae?

A

structural “fault lines’’ in the enamel where they haven’t gotten rid of all their proteins

38
Q

What are enamel spindles?

A

Odontoblastic processes that penetrate the enamel.

39
Q

Where is the “Scallop” found? why is it useful?

A

at the DEJ

helps with holding the crown on the dentin

40
Q

What is the first layer of dentin formed called?

A

Mantle dentin

41
Q

What are von Korffs fibers?

A

collagen fibrils in dentin matrix

42
Q

What are the processes that odontoblasts extend into the developing matrix?

A

Tomes FIBERS

43
Q

What is pre-dentin?

A

non-mineralized organic dentin matrix

44
Q

What is primary dentin?

A

The initial dentin formed up to the pulp (mantle dentin, and circumpulpal initial)

45
Q

What is secondary dentin? when is it produced?

A

dentin laid after root formation (produced throughout life)

46
Q

What is tertiary dentin?

A

dentin produced because of trauma

47
Q

What’s the difference in Type 1 ,2, and 3 dentinogenesis imperfecta?

A

1 and 2 are small pulp

3 is hypomineralized large pulp

48
Q

Where are dead tracts? and why are they there?

A

TRapped air in the dentil tubules

to stop the bacteria from progressing through the dentin

49
Q

What is sclerotic dentin?

A

tubules get plugged up with mineral

Oral Bio 2 (4 decks)

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