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oral embryology > quiz on Lecture 8 > Flashcards

quiz on Lecture 8 Flashcards

1
Q

composition of dentin: inorganic, organic, and water

A

inorganic: 70%
organic: 20%
water: 10%

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2
Q

dentin is covered by what in the crown, and by what on the root

A

enamel; cementum

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3
Q

dentin protects the pulp and

A

makes up the bulk of the tooth

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4
Q

is dentin vascular or avascular

A

avascular

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5
Q

what color is dentin

A

yellowish; esp during attrition(occurs faster if dentin is exposed rather than for enamel); not whiter than enamel

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6
Q

dentin is also:

A

slightly elastic

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7
Q

apposition of dentin occurs how often?

A

throughout the life of the tooth; does not stop after eruption like enamel

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8
Q

odontoblasts were peripheral cells of the what

A

dental papilla

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9
Q

where do odontoblast start making dentin?

A

at DEJ

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10
Q

this is surrounded by predentin(newly deposited uncalcified dentin matrix) and goes toward the inside; long cellular extension located within dentinal tubule

A

odontoblastic processes

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11
Q

lines of von ebner are what?

A

incremental lines; hypomineralized

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12
Q

where does mineralization occur in dentin

A

predentin/dentin complex

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13
Q

as the previous later of predentin becomes dentin;

A

a new layer of predentin is formed

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14
Q

predentin matures by forming these which mineralize/calcify into mature dentin and fuse like water colors on paper

A

globules

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15
Q

layer- areas of calcified dentin with hypomineralized areas at their surface(contains interglobular dentin); in book: both primary and secondary mineralization have occured with complete crystalline fusion and appear as lighter rounded areas on a microscope

A

globular dentin

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16
Q

occurs in coronal dentin near DEJ; hypomineralized area between calcified globules where globules are fused incompletely

A

interglobular dentin

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17
Q

dentin tubules are hypomineralized or hyper?

A

hypo

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18
Q

process are enclosed in a

A

dentinal tubule

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19
Q

dentinal tubules can run from DEJ

A

the periphery of the pulp

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20
Q

tubules are crowded near the

A

pulp due to narrowing of this region

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21
Q

tubules follow S-shape path along length of

A

tubules

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22
Q

movement of odontoblasts to a narrower area

A

primary curve

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23
Q

small waves, movement during night and day of odontoblasts

A

secondary curve

24
Q

diameter of dentinal tubules

A

4 um wide

25
Q

lateral branches that arise at right angles to the main tubule

A

canaliculi

26
Q

tubules that are obliterated by peritubular dentin(makes up inside of tubule); this forms a protective mechanism to wall of bacteria to protect pulp

A

sclerotic dentin

27
Q

air filled tubules caused by death of odontoblastic process, appear black because of histologic stain of empty dentinal tubules

A

dead tracts

28
Q

caused by looping of dentinal tubules; only found in root cementum but is in dentin; adjacent to DCJ

A

tomes granular layer

29
Q

1st dentin made because it is closer to DEJ

A

mantle dentin

30
Q

lies immediately adjacent to DEJ(between DEJ and globular layer)

A

mantle dentin

31
Q

how thick is mantle dentin

A

10-30 um thick

32
Q

how are the collagen groups arranged in

A

perpendicular to DEJ

33
Q

is mantle dentin more or less calcified than circumpulpal?

A

less calcified

34
Q

dentin that is closer to the pulp

A

circumpulpal dentin

35
Q

this layer of dentin is around outer pulpal wall; between globular layer and pulp

A

circumpulpal

36
Q

this dentin layer has finer collagen fibers and is more calcified than mantle dentin

A

circumpulpal dentin

37
Q

fibers are parallel to DEJ

A

circumpulpal

38
Q

S curve goes through mantle and

A

circumpulpal

39
Q

fill up tubules with sclerotic; formed around odontoblastic process(makes wall of dentinal tubules

A

peritubular dentin

40
Q

calcification of peritubular dentin

A

highly calcified

41
Q

what dentin’s deposition can cause tubules to narrow with age

A

peritubular dentin

42
Q

this type of dentin is located between dentinal tubules and is less calcifed

A

intertubular dentin

43
Q

formed before completion of apical foramen; closer to DEJ

A

primary dentin

44
Q

includes mantle and circumpulpal dentin(big s curve, bulk of dentin) and includes globular layer

A

primary dentin

45
Q

how much of primary dentin is made per day?

A

4um

46
Q

formed after completion of the apical foramen; formed at a slower rate; closer to pulp(thinner than primary)

A

secondary dentin

47
Q

which kind of dentin: pulp gets narrower because odontoblasts keep traveling inward making dentin

A

secondary dentin

48
Q

forms rapidly in localized areas in response to trauma of dentinal tubules; not everyone has it; makes pulp narrower; lighter and right under dead tracts

A

tertiary, reactive, or reparative dentin

49
Q

under tertiary dentin

A

cavity preparations, attrition or bruxism, thermal water sprays

50
Q

when dentinal tubules become exposed to outside environment make direct contact with pulp

A

sensory conduction

51
Q

tubules serve as entry to cariogenic microorganisms when caries extend from enamel into dentin

A

caries

52
Q

dentin is exposed as reseult of caries, cavity prep, gingival recession or attrition; open dentinal tubules may be painful

A

dentinal hypersensitivity

53
Q

fluid open exposed tubules begin to evaporate; the movement of fluid caused by evaporation may stimulate nerves nearest odontoblast to produce pain; explains dentin sensitivity

A

hydrodynamic theory

54
Q

occurs at a more rapid rate because its mineralized content is lower

A

attrition

55
Q

odontoblasts in the area of the affected tubules may perish because of the injury, but neighboring undifferentiated mesenchymal cells of the pulp can move to the area and become odontoblasts

A

reparative dentin

56
Q

if the tertiary dentin is formed by existing odontoblasts, considered

A

reactive dentin

oral embryology (10 decks)

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