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Micro Exam 3 > Tooth Development > Flashcards

Tooth Development Flashcards

1
Q

begins at 6-8 weeks of gestation

A

primary dentition

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2
Q

begins at 20 week of gestation to 10th month after birth

A

secondary dentition

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3
Q

Begins at 20th week of gestation to 5th year after birth (3rd molars)

A

permanent molars

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4
Q

teeth develop from the

A

oral mucosa

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5
Q

stages of tooth development:

A

induction
bud
cap
bell
crown
root

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6
Q

dental lamina development starts ??? at the midline and proceeds ???

A

starts anteriorly at the midline and proceeds posteriorly

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7
Q

tooth placode is found in what stage

A

induction phase

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8
Q

tooth bud is found in what stage

A

bud stage

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9
Q

histodifferentation occurs in what stage

A

cap stage

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10
Q

outer enamel epithelium contains what shape cells

A

cuboidal

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11
Q

inner enamel epithelium contains what shape of cells

A

columnar

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12
Q

neural crest cells/ectomesenchyme become

A

dental papilla

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13
Q

outer neural crest cells/ectomesenchyme become

A

dental follicle (dental sac)

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14
Q

basement membrane is found

A

between the IEE and the dental papilla

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15
Q

cytodifferentiation, morphogenesis, successional lamina formation, disintegration of the dental lamina occur in what stage

A

bell stage

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16
Q

the cells inside the body of the enamel organ secrete water absorbing glycosaminoglycans but hold onto each other through desmosomes so they look like stars

A

stellate reticulum

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17
Q

flat, ectodermal cells adjacent to the inner enamel epithelium form

A

stratum intermedium

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18
Q

secondary enamel knots signal to form the sites of the future cusps of the teeth

A

morphogenesis

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19
Q

each tooth has determined the cusp form ???? to any tissue mineralization

A

prior to

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20
Q

outgrowth of the dental lamina on the lingual side, gives rise to primordium of enamel organ for tooth germ of permanent teeth

A

successional lamina

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21
Q

what stage does the dental lamina disintegrate

A

bell stage

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22
Q

do molars have deciduous precursors

A

no

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23
Q

what stage is tooth germ first identifiable

A

cap stage

24
Q

what stage of tooth development does morphodifferentiation happen

A

bell stage

25
Q

the tooth bud comes off of what structure

A

dental lamina

26
Q

Formation of dental lamina and determination of future tooth location

A

induction phase

27
Q

Dental lamina ectoderm grow into neural crest/ectomesenchyme

A

bud stage

28
Q

Histodifferentiation (now it’s a tooth germ). Invagination of enamel organ into itself due to differences in growth rates of lateral (faster growth) and medial (slower growth) inner enamel epithelium (IEE) cells

A

cap stage

29
Q

Cytodifferentiation, morphodifferentiation, formation of the successional lamina, disintegration of the dental lamina

A

bell stage

30
Q

When hard tissue is laid down

A

crown stage

31
Q

formation of the root

A

root stage

32
Q

Lots of interactions between the inner enamel epithelium and the dental papilla to ultimately form

A

ameloblasts and odontoblasts

33
Q

dentin is laid down first followed by enamel

A

crown stage

34
Q

The basement membrane separating the enamel organ from the dental papilla becomes the

A

dentin enamel junction

35
Q

formed by collapse of outer enamel epithelium and stellate reticulum onto stratum intermedium and inner enamel epithelium/ameloblasts

begins at the cusp

A

reduced enamel epithelium

36
Q

Before hard tissue is laid down, the enamel organ receives its blood supply via blood vessels in the

A

dental papilla

37
Q

Once hard tissue is laid down, the papilla blood vessels may no longer

A

supply the ameloblasts

38
Q

The ameloblasts are then nourished via

A

blood vessels from the outside of the outer enamel epithelium after the layers of the enamel organ collapse to form the reduced enamel epithelium (REE)

39
Q

Inner enamel epithelial cells differentiation into pre-ameloblasts

A

early bell stage

40
Q

Pre-ameloblasts: nuclei are located close to the basement membrane

A

bell stage

41
Q

Ameloblasts: nuclei migrate away from the basement membrane to opposite end of the cell as it prepares to secrete enamel

A

crown stage

42
Q

reduced enamel epithelium gives rise to the

A

attachment epithelium (that binds the gingiva to the hard tissue of the tooth)

43
Q

What layers from the reduced enamel epithelium?

A

Inner enamel epithelium
Stratum intermedium
Stellate reticulum
Outer enamel epithelium

44
Q

What does the inner enamel epithelium turn into?

A

ameloblats

45
Q

Reflection of outer enamel epithelium onto inner enamel epithelium

A

cervical loop

46
Q

The crown stage ends when enamel and dentin formation reaches the cervical loop

A

root formation

47
Q

Will elongate inferiorly during root development

A

cervical loop

48
Q

The Hertwig’s Epithelial Root Sheath does not form into the root, but

A

determines the shape of the root

49
Q

invaginations of the hertwigs epithelial root sheath at the apex of the root is the

A

epithelial diaphragm

50
Q

Epithelial root sheath grows apically as an epithelial cylinder from the cervical edge of the enamel organ

A

single root development

51
Q

occur when there are additional extensions of the diaphragm that meet in the midline separating the apical foramen into two or more foramen and subsequently, roots

A

multiple roots

52
Q

Root formation and tooth eruption occur

A

simultaneously

53
Q

Congenital tooth abnormalities

A

Splitting of the tooth germ or
Fusion of adjacent tooth germs

54
Q

Hertwig’s epithelial root sheath forms from:

A

Cervical loop: inner enamel epithelium and outer enamel epithelium

55
Q

What cell differentiates into cementoblasts?

A

Dental follicle cell

Micro Exam 3 (2 decks)

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