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23 Endodontics > 1 - Pulp Histology > Flashcards

1 - Pulp Histology Flashcards

1
Q

can any restorative procedure affect the pulp?

A

YES

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2
Q

what are the effects of irritants and restorative procedures on the pulp

A
  1. affect pulp thru dentinal tubule (indirect)
  2. can produce damage thru pulp exposure (direct)
  3. can generate heat that affects pulp
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3
Q

endodontics is the branch of dentistry concerned with the morphology, physiology, and pathology of the human ___ and ___.

A

dental pulp; periradicular tissues

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4
Q

endo = ___
donto = ___

A

inside; tooth

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5
Q

the study of ___ includes the basic clinical sciences, including the biology of normal pulp and etiology, diagnosis and prevention of diseases of the pulp and periradicular tissues

A

endodontics

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6
Q

what encompasses the treatment of diseases and injuries to the pulp and associated periradicular tissues

A

endodontics

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7
Q

what is the AAE

A

american association of endodontics

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8
Q

what is located in the center of crown and root and is made of loose connective tissues

A

dental pulp

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9
Q

what is enclosed in hard walls (dentin)

A

dental pulp

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10
Q

what has poor collateral circulation and is terminal end circulation

A

dental pulp

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11
Q

when the dental pulp is removed intact, does it maintain its shape

A

yes, it is a firm tissue that remains its shape

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12
Q

what holds the connective tissue of the dental pulp? what reinforces this structure?

A

held together by ground substance; reinforced by collagen fibers

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13
Q

what is the derivative of dental pulp

A

neural crest cells/ectomesenchyme

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14
Q

proliferation and condensation of neural crest/ectomesenchyme forms what

A

dental papilla

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15
Q

what is the mature pulp derived from

A

dental papilla

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16
Q

what is enamel derived from

A

enamel organ

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17
Q

what is pulp and dentin derived from

A

dental papilla

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18
Q

what is cementum and PDL derived from

A

dental sac

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19
Q

what is step 1 of tooth development

A

papilla -> IEE -> ameloblasts

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20
Q

what is step 2 of tooth development

A

ameolblasts -> papilla -> odontoblasts -> predentin

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21
Q

what is step 3 of tooth development

A

predentin -> ameloblasts -> enamel

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22
Q

what is the epithelial diaphragm also called

A

cervical loop

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23
Q

the epithelial diaphragm is the junction of what

A

IEE and OEE

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24
Q

the epithelial diaphragm is the future what

A

CEJ

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25
Q

the proliferation of what forms the root

A

HERS

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26
Q

what happens when HERS is ruptured

A

exposes dentin to connective tissue. exposed dentin stimulates cementum deposition

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27
Q

what are epithelial remnants from HERS and remain dormant

A

Cell Rests of Malasseze

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28
Q

if cell rests of Malasseze are activated by inflammation, what happens

A

can proliferate providing lining of radicular cysts

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29
Q

what is an accessory communication between pulp and periodontum

A

lateral canal

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30
Q

how do lateral canals form

A
  1. root sheath breaks down before dentin has a chance to be laid down
  2. if blood vessels are not displaced during root formation
31
Q

what is a narrow opening at root end and a passage for nerves and blood vessels

A

apical foramen

32
Q

what is the narrowest part of the canal

A

apical CDJ

33
Q

T/F: the apical foramen maintains its size throughout life

A

FALSE! apical foramen changes with age due to dentin and cementum deposition

34
Q

what are the zones of the pulp

A
  1. odontoblastics layer
  2. cell free zone
  3. cell rich zone
  4. pulp core
35
Q

how is the odontoblastic zone arranged

A

palisade arrangement

36
Q

what penetrates the odontoblastic zone

A

free nerve endings (pain receptors)

37
Q

how do odontoblasts communicate with each other

A

via tight, adhering, and gap junctions

38
Q

T/F: if one part of odontoblastic zone is affected, many others are too

39
Q

the cell free zone is also called what

A

zone of weil

40
Q

what is present in the cell free zone

A
  1. nerve fibers
  2. capillaries
41
Q

what zone can diminish in size or temporarily disappear during rapid dentin formation

A

cell free zone

42
Q

what zone contains many undifferentiated mesenchymal cells and fibroblasts

A

cell rich zone

43
Q

what zone serves as a reservoir for destroyed odontoblasts

A

cell rich zone

44
Q

what zone is most frequently observed in coronal pulp

A

cell rich zone

45
Q

describe central zone or core

A
  1. contains loose connective tissue
  2. contains larger nerves and blood vessels
46
Q

what are the components of dental pulp

A
  1. cells
  2. intercellular components
  3. nerves
  4. blood vessels
  5. lymphatics
47
Q

what are the cells of the pulp

A
  1. odontoblasts
  2. fibroblasts
  3. undifferentiated mesenchymal cells
  4. inflammatory cells
48
Q

describe odontoblast structure

A
  1. cell body
  2. odontoblastic processes
49
Q

what cells found in odontoblast

A
  1. RER
  2. golgi complex
  3. mitochondria

(seen in cells that produce tissue matrix)

50
Q

what are the odontoblastic functions

A
  1. synthesize (cell body)
  2. secretory (odontoblastic process)
  3. mineralizing
51
Q

what is the most abundant cell in the pulp

A

fibroblasts

52
Q

where are fibroblasts the most abundant in the pulp

A

cell rich zone

53
Q

what do fibroblasts produce

A
  1. collagen matrix (I + III)
  2. ground substance matrix
54
Q

where are undifferentiated mesenchymal cells most abundant

A

cell rich zone

55
Q

T/F: undifferentiated mesenchymal cells can differentiate into different cells

56
Q

what is a reservoir for lost cells

A

undifferentiated mesenchymal cells

57
Q

what are the different types of inflammatory cells

A
  1. acute - neutrophils
  2. chronic - lymphocytes, plasma cells, macrophages
58
Q

cells of the immune system comprise ___% of the cells in normal dental pulp

59
Q

what are intercellular components

A
  1. intercellular fluid
  2. ground substance
  3. collagen fibers
  4. blood vessels and nerves
60
Q

what is derived from pulpal capillaries and is a vehicle for nutrients and waste removal

A

intercellular fluid

61
Q

what is a sol-gel substance

A

ground substance

62
Q

what is ground substance made of

A
  1. glycosaminoglicans
  2. glycoproteins (complex protein-carb molecules)
  3. water
63
Q

what supports cells and is a transport medium for nutrients

A

ground substance

64
Q

is the composition of ground substance altered by age and disease?

65
Q

what is the role of ground substance

A
  1. helps regulate overall intrapulpal pressure
  2. acts as a barrier against spread of microbes
66
Q

what type of collagen found in dentin

67
Q

what collegen found in pulp

68
Q

odontoblasts produce what type of collagen

69
Q

fibroblasts produce what type of collagen

A

type I and III

70
Q

collagen fibers are ___ chains

A

polypeptide chains

71
Q

immature collagen fibers are called what

A

reticular fibers

72
Q

what forms collagen fibers

A

reticular fibril aggregation to form bundles

73
Q
A

A = core
B = cell rich
C = cell free
D = odontoblast
E =pre dentin
F = dentinal tubules

23 Endodontics (12 decks)

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