Oucod Oral Histology Lecture 3 Dentin And Pulp

Front 1

Which cells cause the differentiation of odontoblasts?

Back 1

Cells in the IEE (preameloblasts)

Front 2

From which region do odontoblasts originate?

Back 2

dental papilla

Front 3

large collagen fibers and ground substance combine at the basement membrane to form what?

Back 3

mantle dentin (large fibers are von Korff fibers)

Front 4

What do odontoblasts secrete?

Back 4

collagen

Front 5

As odontoblasts secrete predentin, they move towards the _______?

Back 5

pulp

Front 6

Odontoblastic processes will be surrounded by predentin and then become mineralized to become ____________?

Back 6

dentinal tubules

Front 7

The first dentin deposited at the DEJ is called _______ dentin.

Back 7

mantle

Front 8

Predentin matrix allows for less invasion of HA crystals than enamel. This is why dentin is less ___________ than enamel.

Back 8

mineralized

Front 9

mantle dentin is (heavlily/not heavily) mineralized?

Back 9

not heavily

Front 10

_________________ dentin is formed a distance from the DEJ is more highly mineralized than preceeding dentin.

Back 10

circumpulpal

Front 11

______________ is the production of a matrix followed by mineralization by HA crystals.

Back 11

dentinogenesis

Front 12

radial striation of dentin is due to the __________ ___________?

Back 12

dentinal tubules

Front 13

Dentinal tubules form an _______________ shape.

Back 13

S curved

Front 14

Dentinal tubules are straighther in (root/crown) dentin?

Back 14

root

Front 15

Caries affecting dentin will affect pulp (apically/coronal) to the caries?

Back 15

apically

Front 16

_________________ are small waves in dentinal tubules.

Back 16

Secondary curves

Front 17

Crests of secondary curves are approx. __um apart?

Back 17

4 (daily deposition)

Front 18

Secondary curves represent the minor changes in ____________ movement in successive 24 hour periods.

Back 18

odontoblastic

Front 19

Dentinal tubule density is highest (near the enamel/near the pulp)?

Back 19

Near the pulp (radiation of tubules)

Front 20

Dentinal tubule density is _x higher near the _____?

Back 20

4, pulp

Front 21

T or F: dentinal tubules have an increase in density near the DEJ due to branching?

Back 21

True

Front 22

What is A?

Back 22

dentinal tubule brancing at the DEJ

Front 23

(Crown/root) dentin shows many side branches called ___________?

Back 23

root, canaliculi

Front 24

Is this root or crown dentin? Why?

Back 24

root, high density of side branching

Front 25

Which is more calcified, intertubular or peritubular dentin?

Back 25

peritubular

Front 26

Collagen fiber in intertubular dentin run (parallel/perpendicular) to the dentinal tubule?

Back 26

perpendicular

Front 27

Intertubular dentin has a (coarse/delicate) collagen matrix while peritubular dentin has a (coarse/delicate) collagen matrix?

Back 27

coarse, delicate

Front 28

Another name for peritubular dentin is?

Back 28

sheath of Neumann

Front 29

initial dentin secretion by odontoblasts is (intertubular/peritubular)?

Back 29

intertubular

Front 30

Peritubular dentin is secreted during ____________?

Back 30

calcification

Front 31

When does peritubular dentin calcify?

Back 31

When it is secreted

Front 32

There are three layers of dentin. What is the middle layer?

Back 32

globular dentin

Front 33

Interglobular dentin is (highly mineralized/has little mineralization/non-mineralized)?

Back 33

non-mineralized

Front 34

Interglobular dentin represents imperfections in the calcification _______?

Back 34

front

Front 35

Interglobular dentin exhibits _________ depressions on outer surface.

Back 35

rounded

Front 36

Mineralization in dentin occurs as ___________ aggregations which eventually ________.

Back 36

sperical, fuse

Front 37

nuclei of mineralization occur along ___________ fibers.

Back 37

collagen

Front 38

The granular layer of Tome's is the peripheral dentin in the (root/crown).

Back 38

root, remember in the crown, near enamel it is the mantle layer

Front 39

The granular layer of Tome's is composed of __________ islands of dentin and appears as dark grains near the _____?

Back 39

uncalcified; dentino-cemento junction

Front 40

T or F: the granular layer of Tome's is similar to the globular but smaller

Back 40

True

Front 41

The granules in the granular layer of Tome's have been proposed as:

Back 41

1. uncalcified cores of large collagen fibers
2. twisted ends of dentinal tubules

Front 42

What is the arrow pointing to?

Back 42

granular layer of Tome's

Front 43

The imbrication lines of von Ebener correspond with what in the enamel?

Back 43

cross striations

Front 44

von Ebener lines are produced by _______________?

Back 44

daily dentin deposition

Front 45

Lines of Owen correspond with what in enamel?

Back 45

stria of retzius

Front 46

Lines of Owen follow the contour of the ______________?

Back 46

pulpal surface

Front 47

Describe the 3 theories of stimulation involving dentinal tubules.

Back 47

1. intratubular nerves
2. odontoblasts as receptors
3. fluid movement model

Front 48

Name the 3 types of dentin.

Back 48

1. primary
2. secondary
3. reactive (also tertiary or reparative)

Front 49

Primary dentin is deposited before completion of the ______ ___________?

Back 49

apical foramen

Front 50

Secondary dentin is deposited after completeion of the ________ _____________?

Back 50

apical foramen

Front 51

Tertiary, reparative or reactive dentin is deposited in response to an ___________?

Back 51

irritant

Front 52

What type of dentin is on the right and which on the left?

Back 52

Primary on the left and secondary on the right

Front 53

What is the arrow pointing to?

Back 53

reparative or reactive dentin, probably due to gingival recession

Front 54

What is the arrow pointing to?

Back 54

tertiary, reparative or reactive dentin

Front 55

Dead tracts are tubules filled with _____?

Back 55

air (they're empty)

Front 56

T or F: damaged dentin still contains dentinal tubules?

Back 56

False

Front 57

Dead tracts will appear ______ on ground sections.

Back 57

dark

Front 58

Blind tracts or sclerotic dentin are (empty/filled) and are (dark/transparent)?

Back 58

filled, transparent

Front 59

T or F: Blind tracts and dead tracts are both due to irritation.

Back 59

True

Front 60

T or F: Blind tracts are due to chronic irritation?

Back 60

True

Front 61

T or F: Dead tracts are due to chronic irritation?

Back 61

False

Front 62

The white star is a ___________ while the black star is a _________?

Back 62

dead tract (dark material), blind tract (white material)

Front 63

The pulp cavity arise from what structure?

Back 63

dental papilla

Front 64

Pulp cavity is comprised of what type of tissue?

Back 64

Loose CT (type I and type III collagen), cells and ground substance

Front 65

What is the function of the pulp cavity?

Back 65

to support odontoblasts

Front 66

The pulp cavity has a hole at its apical end, what is it called? What enter this hole?

Back 66

apical foramen; nerves and blood vessels

Front 67

What is the layer denoted by 'A'?

Back 67

odontoblasts with pulp cavity beneath

Front 68

Name the 3 zones of the pulp and what they contain.

Back 68

1. odontoblast zone - odontoblasts and von Korffs fibers
2. cell free zone of Weil - von Korffs fibers
3. cell rich zone - mainly fibroblasts, von Korffs fibers and the parietal nerve plexus of Raschkow

Front 69

What other cell types are present in the cell rich zone of the pulp besides fibroblasts?

Back 69

mesenchymal, macrophages, lymphocytes, plasma, and eosiniphils

Front 70

(Parasympathetic/sympathetic) nerve fibers control the blood supply within the pulp?

Back 70

Sympathetic (thank you physiology)

Front 71

What are the black things?

Back 71

nerve fibers (parietal nerve plexus of some russian guy)

Front 72

What are a-d?

Back 72

a- mantle dentin
b- odontoblasts
c- cell free zone of Weil
d- cell rich zone

Front 73

What are a-e?

Back 73

a- dentin
b- odontoblasts
c- cell free zone of Weil
d- cell rich zone
e- parietal nerve plexus of Raschkow

Front 74

What are the arrows pointing to?

Back 74

black- cell rich zone
white - cell free zone of Weil
red- parietal nerve plexus of Raschkow

Front 75

Vascular supply in the dentin supplies what cells?

Back 75

odontoblasts

Front 76

Sharp pain in the pulp is mediated by __________ fibers.

Back 76

myelinated

Front 77

Dull, throbbing pain in the pulp is mediated by ____________ fibers.

Back 77

unmyelinated

Front 78

Does the pulp have lymphatic drainage?

Back 78

Probably not

Front 79

What are the blue and red lines at the bottom of the picture?

Back 79

idk, jk, lol :)

Front 80

What type of autonomic fibers are in the pulp and are they myelinated?

Back 80

sympathetic, no

Front 81

From what ganglion do the autonomic fibers start their path to the pulp?

Back 81

super cervical ganglion

Front 82

Sensory fibers in the pulp come from what ganlgion?

Back 82

maxillary and mandibular branches of the trigeminal

Front 83

Are sensory pulp fibers myelinated or unmyelinated?

Back 83

both

Front 84

Which fibers, (myelinated/unmyelinated) innervate odontoblasts and may extend shortly into the dentinal tubules?

Back 84

unmyelinated

Front 85

What is this picture from?

Back 85

The first maxillay molar of R2D2, mesiobuccal cusp to be exact.

Front 86

In a sensitive tooth, you would expect to (more/less) nerve fibers?

Back 86

more

Front 87

Name the two regions of the pulp.

Back 87

Coronal and radicular

Front 88

What is a pulp horn?

Back 88

Its the vertical extension of the pulp into a cuspal region (or the horn looking thingy in the pulp if you prefer)

Front 89

Where is coronal pulp located?

Back 89

Above the cervix (of the tooth)

Front 90

Where is radicular pulp located?

Back 90

Below the cervix

Front 91

What is the shape of the radicular pulp cavity?

Back 91

conical and tapered

Front 92

T or F: Like a mans nose, the pulp cavity increases with age?

Back 92

False

Front 93

T or F: the pulp cavity becomes more fibrous with age?

Back 93

True

Front 94

T or F: the pulp cavity becomes less cellular with age?

Back 94

True

Front 95

Minor pathological events result in _______________ of the pulp?

Back 95

compression (pulp is surrounded by hard tissue)

Front 96

T or F: compression of the pulp can lead to intense pain and death of the pulp?

Back 96

True

Front 97

Which tooth is from an older person?

Back 97

The one one the right (pulp cavity is smaller)

Front 98

A true pulp stone is called a __________?

Back 98

denticle

Front 99

T or F: denticles are composed of dentin and have dentinal tubules?

Back 99

True

Front 100

Denticles are formed by interaction of what two types of cells?

Back 100

epithelial and mesenchymal

Front 101

False pulp stones, like true pulp stones are called ___________?

Back 101

denticles

Front 102

(False/true) pulp stones have concentric rings?

Back 102

false

Front 103

Pulp stones can be ________, __________, or ____________?

Back 103

free, attached or embedded

Front 104

False pulp stones are formed by calcification of ________?

Back 104

debris

Front 105

What am I?

Back 105

True pulp stone

Front 106

What is this?

Back 106

True pulp stone

Front 107

What is this?

Back 107

True pulp stone

Front 108

What is this?

Back 108

false pulp stone