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3RD year > OralHisto Midterms Exam > Flashcards

OralHisto Midterms Exam Flashcards

1
Q

what is the process of enamel formation called

A

amelogenesis

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2
Q

protein in not fully matured enamel

A

amelogenin

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3
Q

represents the short dentinal tubules near the DEJ

A

enamel spindle

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4
Q

when does amelogenesis occur

A

apposition

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5
Q

cap stage week

A

9-10

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6
Q

radiograph of enamel

A

radiopaque

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7
Q

chemical properties of dentin

A

65%-75% inorganic
30%-35% organic

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8
Q

formative tissue of dentin

A

dental papilla

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9
Q

future DEJ

A

basement membrane

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10
Q

produces periodontium

A

dental sac

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11
Q

stage where ameloblasts form the primary enamel cuticle as the first protective covering of the enamel;
formation of the ree

A

protective

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12
Q

wavelike features

A

perikymata

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13
Q

what is the crystalline structural unit of enamel

A

enamel rod/prism

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14
Q

produces the future dentin and pulp

A

dental papilla

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15
Q

oral epithelium produces ?

A
  1. dental lamina
  2. vestibular lamina
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16
Q

what has the longest developmental period for any set of organs in the body

A

teeth

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17
Q

final stage of odontogenesis

A

apposition

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18
Q

labial and buccal to the dental lamina ; develop independently

A

vestibular lamina

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19
Q

there are four layers of the enamel organ that fuse to form?

A

Reduced Enamel Epithelium
(REE)

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20
Q

protein in matured enamel

A

enamelin

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21
Q

differentiates into odontoblast
(dentin-secreting cells)

A

outer peripheral cells

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22
Q

small dark brushes with their bases near the DEJ

A

enamel tufts

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23
Q

dentin that is formed after the completion of the apical foramen and continues to form throughout the life of the tooth

A

secondary dentin

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24
Q

controlled cellular growth & accumulation of by-products

A

proliferation

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25
Q

formative cell of dentin

A

odontoblast cell

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26
Q

forms the bulk of the tooth

A

dentin

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27
Q

a PRONOUNCED incremental line of retzius

A

neonatal line

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28
Q

fibers that insert in the outer layers of the cementum and surrounding alveolar bone

A

Sharpeys fibers

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29
Q

an optical phenomenon produced by changes in direction between adjacent groups of rods ;
Dark & Light alternating zones

A

Hunter Shreger Bands

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30
Q

basic structural unit of dentin

A

dentinal tubules

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31
Q

marks stress / trauma experienced by the ameloblast during birth

A

neonatal line

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32
Q

interaction between embryological cells

A

induction

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33
Q

consists of incorporation of the fibrillar matrix

A

ground substance

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34
Q

apatite crystals

A

crystallization

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35
Q

sensation fibers

A

beta fibers

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36
Q

main composition of enamel

A

calcium hyrdroxyapatite

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37
Q

dentin that is formed in a tooth before the completion of the apical foramen of the root, which is the opening in the root’s pulp canal

A

primary dentin

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38
Q

aka lip furrow band

A

vestibular lamina

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39
Q

a depression results in the deepest part of each tooth bud forming the cap called?

A

enamel organ

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40
Q

permanent teeth count

A

32

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41
Q

partially mineralized vertical sheets of enamel matrix that extend from the DEJ to the outer occlusal surface

A

enamel lamellae

42
Q

initially consist of 2 horseshoe - shaped bands of tissue at the surface of the stomodeum

A

oral epithelium

43
Q

overlapping of primary and permanent teeth

A

mixed dentition

44
Q

protoplasmic projections of ameloblast into the matrix

A

Tome’s process

45
Q

appears as an extension of the dental lamina into the ectomesenchyme lingual to the developing primary tooth germs

A

successional dental lamina

46
Q

less elastic; coarse fibers

A

collagen fibers

47
Q

acellular structures that separate the oral epithelium and ectomesenchyme

A

basement membrane

48
Q

formation of fibers

A

fibrilogenesis

49
Q

interaction of ameloblasts with adjacent mesenchymal cells determining the shape of the DEJ and crown

A

morphogenic

50
Q

the remaining ectomesenchyme surrounding the outside of the enamel organ

A

dental sac

51
Q

reparative dentin or reactive dentin

A

tertiary dentin

52
Q

determines the shape and number of roots

A

HERS

53
Q

dentin found in between the tubules

A

intertubular dentin

54
Q

2 phases of amelogenesis

A

formative
mineralization & maturation

55
Q

enamel cuticle aka

A

Nasmyth’s membrane

56
Q

most apical segment of the HERS

A

epithelial diaphragm

57
Q

what are the four layers that fuses

A

Outer Enamel Epithelium
Inner Enamel Epithelium
Stellate Reticulum
Stratum Intermedium

58
Q

produces enamel

A

enamel organ

59
Q

Korff’s fibers aka

A

alpha fibers

60
Q

dental sac is derived from?

A

ectomesenchyme
(mesenchymal in origin)

61
Q

determines the shape of the crown

A

dentin

62
Q

4 distinct cells in bell stage

A

IEE’
OEE
SR
SI

63
Q

dentin that is formed quickly in local regions in response to a localized injury to the exposed dentin

A

tertiary dentin

64
Q

dentin where the process of response dentin is started by the pulp

A

reparative dentin

65
Q

the hardest mineralized tissue in human body

A

enamel

66
Q

ameloblasts interact with cells of dental papilla at the periphery which later differentiate into odontoblasts

A

organizing

67
Q

dentin that creates the wall of the dentinal tubule

A

peritubular dentin

68
Q

produces enamel matrix

A

ameloblast

69
Q

becomes the primordium of the pulp

A

inner central cells

70
Q

when odontoblast synthesize/produce dentinal matrix at the apical end of the cell and along its process

A

predentin

71
Q

partial mineralization of the segments of matrix

A

primary calcification

72
Q

gradual completions of the mineralization ; rest of the mineral contents are deposited from the height of the crown to the cervical

A

secondary calcification

73
Q

periodontium

A

cementum
periodontal ligaments
alveolar bone

74
Q

first predentin that forms and matures within the tooth near the DEJ and underneath the enamel

A

mantle dentin

75
Q

formative phase main component

A

Tome’s process

76
Q

outer part of the ectoderm gives rise to?

A

the oral epithelium
(primary epithelial band)

77
Q

stage where ameloblasts play a role in maturation of the formed matrix

A

maturative

78
Q

bell stage week

A

11-12

79
Q

unequal growth in different parts of the tooth bud

A

cap stage

80
Q

the extension of an odontoblast

A

odontoblastic process

81
Q

enamel percentage composition

A

96% inorganic
1% organic
3% water

82
Q

stage where there is destruction of the connective tissue along the pathway of eruption

A

desmolytic

83
Q

makes up the bulk of the dentin in a tooth. this type forms and matures after mantle dentin

A

circumpulpal dentin

84
Q

bud stage week

A

8th

85
Q

enamel organ is derived from?

A

ectoderm

86
Q

epithelial diaphragm forms?

A

apical foramen

87
Q

a delicate membrane that covers entire portion of newly erupted crown

A

enamel cuticle

88
Q

attainment of adult form and size due to proliferation, differentiation, and morphogenesis

A

maturation

89
Q

change in identical embryonic cells to become distinct structurally and functionally

A

differentiation

90
Q

series of lines extending from the DEJ towards the tooth surface

A

striae of retzius

91
Q

development of specific tissue morphology or differing from due to embryonic cell migration and inductive interactions

A

morphogenesis

92
Q

what is the life cycle of ameloblasts

A
  1. morphogenic
  2. organizing
  3. formative
  4. maturative
  5. protective
  6. desmolytic
93
Q

a part of the ectomesenchyme deep to the buds has condensed into a mass within the concavity of the cap of the enamel organ

A

dental papilla

94
Q

stage where ameloblasts form the enamel matrix

A

formative

95
Q

fiber from the connective tissue cells especially fibroblasts of dental papilla

A

Korff’s fibers

96
Q

structure responsible for root development

A

cervical loop

97
Q

dentin formation must always occur before enamel formation

A

true

98
Q

over the cusp of teeth rods appear twisted around each other in a seemingly complex arrangement

A

gnarled enamel

99
Q

named for an extensive proliferation of oval masses that penetrate into the ectomesenchyme

A

bud stage

100
Q

what tissue in the body has no nerve supply and is avascular

A

enamel

101
Q

histologic landmarks identified on an ameloblast, cells involved in the production of tooth enamel

A

Tome’s process

102
Q

incremental growth lines seen in enamel and are the result of enamel development

A

striae of retzius

3RD year (10 decks)

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