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Semester 2 Biological Sciences 2 > Dentin and Pulp > Flashcards

Dentin and Pulp Flashcards

1
Q

what forms dentin and pulp

A

ectomesenchymal cells of the dental papilla

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2
Q

outer cells of dental papilla will become ___________ in late bell stage and form ________

A

odontoblasts
dentin

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3
Q

central cells of the dental papilla will form what

A

pulp

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4
Q

comprises bulk of tooth and protects pulp

A

dentin

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5
Q

covered by enamel

A

coronal dentin

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6
Q

covered by cementum

A

radicular dentin

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7
Q

what is the composition of dentin

A

70% hydroxyapatite, 20% organic material (type I collagen)

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8
Q

put bone, dentin, enamel, and cementum in order from hardest to softest

A

enamel > dentin > cementum > bone

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9
Q

is dentin vascular or avascular

A

avascular

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10
Q

make dentin porous

A

dentinal tubules

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11
Q

cells in the inner enamel epithelium differentiate into what

A

preameloblasts

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12
Q

preameloblasts induce outer dental papilla to differentiate into what

A

odontoblasts

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13
Q

what do odontoblasts secrete

A

predentin

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14
Q

after predentin is secreted, the ________________ between the two cell types disintegrates

A

basement membrane

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15
Q

dentin induces preameloblasts to differentiate into ____________ that secrete the enamel matrix

A

secretory ameloblasts

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16
Q

formation of dentin

A

dentinogenesis

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17
Q

what are the two phases of dentinogenesis

A
  1. apposition of matrix (secretion of predentin)
  2. mineralization of predentin
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18
Q

what is the first substance laid down by odontoblasts

A

predentin

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19
Q

is predentin calcified or noncalcified

A

noncalcified

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20
Q

predentin is mostly made of _____________

A

collagen fibers

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21
Q

odontoblast cell bodies move away from dentin to remain with the pulp

A

dentinogenesis

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22
Q

what does each dentinal tubule contain

A

dentinal fluid, odontoblastic process, and part of an afferent nerve axon

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23
Q

run from DEJ to pulp

A

dentinal tubules

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24
Q

what pattern to dentinal tubules follow

A

primary s shaped curve

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25
Q

the primary s shaped curve of dentinal tubules is more pronounced where

A

in coronal dentin

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26
Q

lines of dentin deposition in mature dentin

A

imbrication lines of von Ebner

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27
Q

what do imbrication lines of von Ebner look like

A

growth rings in a tree

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28
Q

what direction do imbrication lines of von Ebner run in

A

Perpendicular to dentinal tubules

29
Q

imbrication lines of von Ebner are perpendicular to ____________ and parallel to __________

A

dentinal tubules
DEJ

30
Q

many imbrication lines together

A

contour lines of owen

31
Q

what do contour lines of owen demonstrate

A

metabolic disturbances

32
Q

occur during trauma at birth

A

neonatal line

33
Q

how can dentin be classified

A

location in general
location in relation to dentinal tubules
time of formation

34
Q

what are the types of dentin when classified by location in general

A

coronal or radicular

35
Q

what are the types of dentin when classified by location in relation to dentinal tubules

A

peritubular or intertubular

36
Q

what are the types of dentin when classified by time of formation

A

primary, secondary, or tertiary

37
Q

lining the walls of dentinal tubules

A

peritubular dentin

38
Q

is peritubular or intertubular dentin more mineralized

A

peritubular

39
Q

this dentin is located between dentinal tubules

A

intertubular dentin

40
Q

formed during tooth development, before completion of apical foramen

A

primary dentin

41
Q

what are the types of primary dentin

A

mantle or circumpulpal

42
Q

outermost layer of primary dentin, adjacent to the DEJ and first to form

A

mantle dentin

43
Q

bulk of primary dentin and innermost layer

A

circumpulpal dentin

44
Q

formed after root formation is complete, after tooth is erupted and is functional

A

secondary dentin

45
Q

does secondary dentin grow slow or fast

A

slow

46
Q

secondary dentin causes a __________ in size of pulp chamber with age

A

decrease

47
Q

formed in reaction to external insults

A

tertiary dentin

48
Q

does tertiary dentin form fast or slow

A

fast

49
Q

what forms tertiary dentin

A

odontoblasts or mesenchymal stem cells

50
Q

changes in dentinal fluid are transmitted to afferent neuron axons

A

hydrodynamic theory

51
Q

innermost tissue of the tooth

A

pulp

52
Q

what forms the pulp

A

central cells of the dental papilla

53
Q

what type of tissue is pulp made of

A

loose connective tissue

54
Q

is pulp mineralized

A

no

55
Q

pulp supports, maintains and allows formation of what

A

dentin

56
Q

what can dental pulp stem cells become

A

new odontoblasts

57
Q

what can pulp be divided into

A

coronal and radicular pulp

58
Q

what is the pulp made of

A

fibroblasts, odontoblasts, dental pulp stem cells, and fibers

59
Q

in pulp, what compromises most of the composition

A

fibroblasts

60
Q

what part of the pulp lines the outside

A

odontoblasts

61
Q

the dental pulp stem cells can differentiate into what

A

new fibroblasts or odontoblasts

62
Q

what fiber types are present in pulp

A

collagen and reticular

63
Q

what layer of pulp is closest to the dentin

A

odontoblastic layer

64
Q

what layer is beneath the odontoblastic layer of pulp

A

cell free zone

65
Q

what is within the cell free zone

A

fibroblasts, odontoblasts, nerves, capillaries, and possibly new dentin

66
Q

what layer is beneath the cell free zone

A

cell rich zone

67
Q

the cell rich zone has a rich ______________ supply

A

vascular

68
Q

what is the innermost zone of the pulp

A

pulpal core

69
Q

the pulpal core has an extensive ___________ supply

A

vascular

Semester 2 Biological Sciences 2 (16 decks)

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