Dentin and Pulp

Question 1

what forms dentin and pulp

Answer 1

ectomesenchymal cells of the dental papilla

Question 2

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

Answer 2

odontoblasts
dentin

Question 3

central cells of the dental papilla will form what

Answer 3

pulp

Question 4

comprises bulk of tooth and protects pulp

Answer 4

dentin

Question 5

covered by enamel

Answer 5

coronal dentin

Question 6

covered by cementum

Answer 6

radicular dentin

Question 7

what is the composition of dentin

Answer 7

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

Question 8

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

Answer 8

enamel > dentin > cementum > bone

Question 9

is dentin vascular or avascular

Answer 9

avascular

Question 10

make dentin porous

Answer 10

dentinal tubules

Question 11

cells in the inner enamel epithelium differentiate into what

Answer 11

preameloblasts

Question 12

preameloblasts induce outer dental papilla to differentiate into what

Answer 12

odontoblasts

Question 13

what do odontoblasts secrete

Answer 13

predentin

Question 14

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

Answer 14

basement membrane

Question 15

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

Answer 15

secretory ameloblasts

Question 16

formation of dentin

Answer 16

dentinogenesis

Question 17

what are the two phases of dentinogenesis

Answer 17

1. apposition of matrix (secretion of predentin)
2. mineralization of predentin

Question 18

what is the first substance laid down by odontoblasts

Answer 18

predentin

Question 19

is predentin calcified or noncalcified

Answer 19

noncalcified

Question 20

predentin is mostly made of _____________

Answer 20

collagen fibers

Question 21

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

Answer 21

dentinogenesis

Question 22

what does each dentinal tubule contain

Answer 22

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

Question 23

run from DEJ to pulp

Answer 23

dentinal tubules

Question 24

what pattern to dentinal tubules follow

Answer 24

primary s shaped curve

Question 25

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

Answer 25

in coronal dentin

Question 26

lines of dentin deposition in mature dentin

Answer 26

imbrication lines of von Ebner

Question 27

what do imbrication lines of von Ebner look like

Answer 27

growth rings in a tree

Question 28

what direction do imbrication lines of von Ebner run in

Answer 28

Perpendicular to dentinal tubules

Question 29

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

Answer 29

dentinal tubules DEJ

Question 30

many imbrication lines together

Answer 30

contour lines of owen

Question 31

what do contour lines of owen demonstrate

Answer 31

metabolic disturbances

Question 32

occur during trauma at birth

Answer 32

neonatal line

Question 33

how can dentin be classified

Answer 33

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

Question 34

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

Answer 34

coronal or radicular

Question 35

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

Answer 35

peritubular or intertubular

Question 36

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

Answer 36

primary, secondary, or tertiary

Question 37

lining the walls of dentinal tubules

Answer 37

peritubular dentin

Question 38

is peritubular or intertubular dentin more mineralized

Answer 38

peritubular

Question 39

this dentin is located between dentinal tubules

Answer 39

intertubular dentin

Question 40

formed during tooth development, before completion of apical foramen

Answer 40

primary dentin

Question 41

what are the types of primary dentin

Answer 41

mantle or circumpulpal

Question 42

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

Answer 42

mantle dentin

Question 43

bulk of primary dentin and innermost layer

Answer 43

circumpulpal dentin

Question 44

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

Answer 44

secondary dentin

Question 45

does secondary dentin grow slow or fast

Answer 45

slow

Question 46

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

Answer 46

decrease

Question 47

formed in reaction to external insults

Answer 47

tertiary dentin

Question 48

does tertiary dentin form fast or slow

Answer 48

fast

Question 49

what forms tertiary dentin

Answer 49

odontoblasts or mesenchymal stem cells

Question 50

changes in dentinal fluid are transmitted to afferent neuron axons

Answer 50

hydrodynamic theory

Question 51

innermost tissue of the tooth

Answer 51

pulp

Question 52

what forms the pulp

Answer 52

central cells of the dental papilla

Question 53

what type of tissue is pulp made of

Answer 53

loose connective tissue

Question 54

is pulp mineralized

Answer 54

no

Question 55

pulp supports, maintains and allows formation of what

Answer 55

dentin

Question 56

what can dental pulp stem cells become

Answer 56

new odontoblasts

Question 57

what can pulp be divided into

Answer 57

coronal and radicular pulp

Question 58

what is the pulp made of

Answer 58

fibroblasts, odontoblasts, dental pulp stem cells, and fibers

Question 59

in pulp, what compromises most of the composition

Answer 59

fibroblasts

Question 60

what part of the pulp lines the outside

Answer 60

odontoblasts

Question 61

the dental pulp stem cells can differentiate into what

Answer 61

new fibroblasts or odontoblasts

Question 62

what fiber types are present in pulp

Answer 62

collagen and reticular

Question 63

what layer of pulp is closest to the dentin

Answer 63

odontoblastic layer

Question 64

what layer is beneath the odontoblastic layer of pulp

Answer 64

cell free zone

Question 65

what is within the cell free zone

Answer 65

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

Question 66

what layer is beneath the cell free zone

Answer 66

cell rich zone

Question 67

the cell rich zone has a rich ______________ supply

Answer 67

vascular

Question 68

what is the innermost zone of the pulp

Answer 68

pulpal core

Question 69

the pulpal core has an extensive ___________ supply

Answer 69

vascular