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2nd SEM > MIDTERM ORALHISTO > Flashcards

MIDTERM ORALHISTO Flashcards

exam

1
Q

tooth development is also known as?

A

odontogenesis

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2
Q

formation and development of enamel

A

amelogenesis

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3
Q

formation of dentin

A

dentinogenesis

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4
Q

epithelial lining of the stomodeum

A

stratified squamous epithelium

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5
Q

primary epithelial band divides into?

A

dental lamina
vestibular lamina

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6
Q

the vestibular lamina gives rise to?

A

oral vestibules

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7
Q

the dental lamina gives rise to?

A

the tooth bud

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8
Q

forms the primary dentition

A

primary dental lamina

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9
Q

dental lamina of the permanent teeth;
seen lingual to the primary dental lamina

A

successional dental lamina

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10
Q

tooth development starts/initiated when?

A

6th week in utero

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11
Q

stages in the life cycle of a tooth

A

growth stage
calcification
eruption
attrition

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12
Q

physiologic process in tooth growth stage

A

initiation
proliferation
histodifferentiation
morphodifferentiation
apposition

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13
Q

morphologic process in tooth growth stage

A

dental lamina
bud stage
early cap stage
advanced cap stage
early bell stage
advanced cap stage
enamel and dentin formation

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14
Q

hardening process; addition of calcium and phosphate in enamel and dentin

A

calcification

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15
Q

vertical movement of tooth towards the oral cavity in its functional position

A

eruption

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16
Q

wearing off of tooth structure by friction of contact

A

attrition

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17
Q

wearing off of tooth structure due to mechanical substances/materials

A

abrasion

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18
Q

wearing away of tooth structure due to acids

A

erosion

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19
Q

germ layers present in cap stage

A

IEE
OEE
stellate reticulum

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20
Q

germ layers present in bell stage

A

IEE
OEE
stellate reticulum
stratum intermedium

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21
Q

this gives rise to the enamel

A

enamel organ

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22
Q

this gives rise to the dentin and pulp

A

dental papilla

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23
Q

this gives rise to the periodontium

A

dental follicle/sac

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24
Q

signifies the presence of an invagination of the dental organ

A

cap stage

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25
Q

Transient structures that may be present during late cap stage until advanced bell stage

A

enamel cord
enamel knot
enamel septum
enamel navel

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26
Q

toothgerm, which is a developing tooth and surrounding structures originates from?

A

ectoderm
mesoderm

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27
Q

what are the tooth germs

A

dental organ (enamel)
dental papilla (dentin & pulp)
dental follicle/sac (cementum, periodontal ligament, alveolar bone)

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28
Q

formative cells of enamel

A

ameloblasts

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29
Q

ameloblasts cell structure

A

tall columnar cells

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30
Q

formative cells of dentin

A

odontoblasts

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31
Q

cell structure of odontoblasts

A

cuboidal but later becomes columnar

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32
Q

the basement membrane separating dental papilla from IEE

A

membrana preformativa
(future DEJ)

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33
Q

dental sac is
mesodermal tissue + dental papilla

(expound)

A

during bell stage, the mesodermal tissue around the dental organ and the base of the dental papilla differentiates into fibrous connective tissue capsule forming the dental sac (or aka dental follicle)

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34
Q

a stage in tooth growth where:
IEE cells → ameloblast
and
dental papilla → odontoblast

A

histodifferentiation

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35
Q

a stage in tooth growth where the form and shape of the crown is to be developed

A

morphodifferentiation

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36
Q

the form and the shape of the crown to be developed is determined by?

A

membrana preformativa

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37
Q

a stage in tooth growth where there is deposition of enamel, dentin, and cementum

A

apposition

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38
Q

an epithelial structure that arise from the junction of the IEE and OEE along the margins of the dental organ

A

Hertwig’s epithelial root sheath
(HERS)

39
Q

the hard translucent tissue covering the anatomical crowns of teeth

A

enamel

40
Q

structural elements of enamel

A

enamel prisms (enamel rods)
interprismatic substance (interrod cementing substance)
prism sheath (rod sheath)

41
Q

brownish lines that mark the growth periods of enamel

A

band of retzius

42
Q

the transverse wave-like grooves thought to be the external manifestations of retzius

A

perikymata

43
Q

leaf-like structural defects extending from the surface of the enamel towards the interior

A

enamel lamellae

44
Q

narrow, ribbon-like structures composed of bundles of poorly calcified rods

A

enamel tufts

45
Q

club-shaped extensions or projections of the dentinal tubules into the enamel

A

enamel spindles

46
Q

alternating light and dark bands originating from dentinoenamel junction towards the surface

A

hunter-schreger’s bands

47
Q

lines crossing the rods 4 microns interval, which becomes more visible when in contact with acid

A

transverse striations

48
Q

2 phases of amelogenesis

A
  1. formative phase
  2. mineralization and maturation phase

explain

49
Q

a thin membrane on the surface of the enamel;
protective covering of the enamel

A

Nasmyth membrane

50
Q

fate of the enamel organ:
what is the result when the 4 layers of cells of the dental organ fuse into one layer

A

reduced enamel epithelium
(REE)

51
Q

what is formed when REE unites with unites with the epithelium of the oral mucosa

A

epithelial attachment

52
Q

what is the life cycle of ameloblasts

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

explain

53
Q

a condition where there is disturbance in the formation and maturation of the enamel matrix

A

amelogenesis imperfecta

54
Q

embryonic tissue of enamel

A

ectoderm

55
Q

formative tissue of enamel

A

enamel organ

56
Q

formative cell of enamel

A

ameloblast

57
Q

area of fusion between the inner dental epithelium and outer dental epithelium

A

cervical loop

58
Q

basic structural units of the enamel

A

enamel prism/ enamel rods

59
Q

Accentuated band of Retzius seen in the partial development of deciduous teeth

A

neonatal line/ring

60
Q

forms the main bulk of the tooth

A

dentin

61
Q

formative tissue of dentin

A

dental papilla

62
Q

formative cell of dentin

A

odontoblast

63
Q

embryonic tissue of dentin

A

mesenchymal tissue

64
Q

basic structural unit of dentin

A

dentinal tubules

65
Q

parts of the dentinal matrix

A

peritubular dentin
intertubular dentin

66
Q

the part of the dentinal matrix that forms the immediate wall of the dentinal tubules;
highly mineralized

A

peritubular dentin

67
Q

the part of the dentinal matrix found between the dentinal tubules;
main bulk of the dentin

A

intertubular dentin

68
Q

these are regularly arranged canals that surround the odontoblastic process;
they radiate from the pulp cavity to the DEJ and DCJ

A

dentinal tubules

69
Q

contents of the dentinal tubules

A

odontoblastic process
dentinal fluid
nerve fibers

70
Q

the cytoplasmic extensions of odontoblasts found inside the dentinal tubules

A

odontoblastic process

71
Q

the fluid present between the odontoblastic process and the wall of the dentinal tubule

A

dentinal fluid

72
Q

theory on pain mechanism of dentin

stimuli in some manner reach the nerve endings in the inner dentin;
stimulus can be pressure or temp

A

direct neural transmission theory

73
Q

theory on pain mechanism of dentin

odontoblast cell is the primary structure excited by the stimulus and the impulse is transmitted to the nerve endings in the inner dentin

A

transduction theory

74
Q

theory on pain mechanism of dentin

various stimuli affect fluid movement in the dentinal tubules;
movement stimulates pain mechanism in the tubules by mechanical disturbance of nerves associated with odontoblasts

A

hydrodynamic theory

75
Q

structural characteristics of dentin

A

interglobular dentin
granular layer of Tome’s
contour lines of Owen
Von Ebner lines
neonatal lines

76
Q

structural characteristic of dentin

hypomineralization between the globules;
imperfectly calcified

A

interglobular dentin

77
Q

structural characteristic of dentin

imperfectly calcified dentinal matrix found at or near the DCJ only

A

granular layer of Tome’s

78
Q

structural characteristic of dentin

lines that mark the difference in the degree of matrix calcification resulting in banding of the dentin

A

contour lines of owen

79
Q

structural characteristic of dentin

incremental lines or imbrication linesdefines each layer of dentin deposited

A

Von Ebner lines

80
Q

structural characteristic of dentin

formed by the abrupt change in environment that occurs at birth;
maybe a zone of hypocalcification

A

neonatal line

81
Q

dentin formed during it development;
formed before eruption

A

primary dentin

82
Q

uncalcified dentin;
layer of dentin found right after the odontoblast cell

A

predentin

83
Q

first calcified dentin

A

mantle dentin

84
Q

main bulk of the primary dentin

A

circumpulpal dentin

85
Q

dentin formed after eruption of tooth

A

secondary dentin

86
Q

dentin formed as a response to injury

A

tertiary dentin

87
Q

dentin that appears to be like bone

A

osteodentin

88
Q

layer by layer calcification of predentin

A

linear calcification

89
Q

globules of calcospherites are formed that enlarge and fuse to form a perfectly calcified dentin

A

globular calcification

90
Q

synthesized by odontoblasts in pre-existing ground substance of dental papilla

A

fibers

91
Q

process of forming fibers

A

fibrilogenesis

92
Q

pre-existing substance of the dental papilla

A

ground substance

93
Q

2 phases of dentinogenesis

A
  1. formation (formative stage)
  2. mineralization (calcification)

2nd SEM (16 decks)

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