Tooth Eruption Flashcards

1
Q

Eruption is part of __________________

A

tooth development

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2
Q

thickening of the epithelium through cell division determines the position where a row of teeth will form

A

primary epithelial band

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3
Q

further epithelial thickening and bifurcation into dental and vestibular lamina

A

dental and vestibular laminae

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4
Q

Invagination of DL determines the locations where individual teeth will
develop. Invagination of DL is stimulated by ectomesenchymal cells
expressing Pax9. Tooth type is also determined at this stage, according to
other transcription factors expressed in the ectomesenchyme

A

bud stage

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5
Q

Beginning of tooth morphogenesis and histodifferentiation processes. The
DL forms the enamel organ (EO). Cells of the EO will differentiate into inner
and outer enamel epithelia, stellate reticulum and stratum intermedium.
EMC will differentiate into dental follicle and dental papilla

A

cap stage

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6
Q

Extension of cervical loop. Enamel knot(s) determine formation of cusps.

A

bell stage

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7
Q

appositional deposition of dentin and enamel

A

late bell stage

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8
Q

Cervical loop transforms into Hertwig epithelial root sheet (HERS), which
becomes an organizing center of root formation. Dentin is deposited
alongside HERS. The HERS fragments and cells of dental follicle deposit
cementum and form PDL. Once the length of a root is complete, HERS
changes its direction inward leading to narrowing of the apical foramen

A

root formation

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9
Q

primary oral cavity is lined with what

A

ectoderm derived epithelium

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10
Q

beneath epithelium, there is what

A

ectomesenchyme

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11
Q

areas of the oral epithelium where dentition will form thicken to form the ________________

A

primary epithelial band

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12
Q

the primary epithelial band splits into what

A

dental lamina and vestibular lamina

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13
Q

dental lamina will develop into buds where what will form

A

individual teeth

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14
Q

where a tooth will form there is invagination of the dental lamina into a ________ and condensation of _____________ around it

A

bud
ectomesenchyme

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15
Q

what stage is the type of tooth and position determined

A

bud stage

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16
Q

the ________ forms from the dental lamina and starts to develop different cell layers

A

enamel

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17
Q

what stage does enamel form in

A

cap stage

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18
Q

what cell layers develop from the enamel/dental lamina

A

outer enamel epithelium
stratum reticulum
inner enamel epithelium
stratum intermedium

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19
Q

cells in the ectomesenchyme form the _____________ and the ______________

A

dental follicle and the dental papilla

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20
Q

when do the dental follicle and dental papilla form

A

cap stage

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21
Q

cells continue to differentiate and the stratum intermedium is evident in this stage

A

bell stage

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22
Q

where the outer enamel epithelium joins the inner enamel epithelium and extends apically

A

cervical loop

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23
Q

when does the cervical loop form

A

bell stage

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24
Q

the enamel knots formed in the bell stage stimulate growth of ________

A

cusps

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25
Q

the outer cells of the dental papilla become ___________ that secrete dentin

A

odontoblasts

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26
Q

when is dentin secreted

A

apposition stage

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27
Q

cells in the inner enamel epithelium become __________ that secrete enamel

A

ameloblasts

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28
Q

when is enamel secreted from ameloblasts

A

apposition stage

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29
Q

once crown formation is complete, the developing tooth does what

A

begins to erupt

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30
Q

while the tooth erupts, what is still forming

A

roots

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31
Q

what forms the hertwig’s epithelial root sheath

A

cervical loop

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32
Q

what does HERS guide

A

root formation

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33
Q

when do primary teeth start developing

A

6th week of prenatal development

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34
Q

when do primary teeth start erupting

A

6 months old

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35
Q

when do permanent teeth start developing

A

14th week of prenatal development

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36
Q

when do permanent teeth begin erupting

A

6 years old

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37
Q

what teeth are nonsuccedaneous

A

first, second, and third molars

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38
Q

develop from successional dental lamina lingual to developing primary teeth

A

succedaneous teeth

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39
Q

develop from posterior extension of dental lamina called the accessional dental lamina

A

nonsuccedaneous teeth

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40
Q

in late cap/early bell stage of the primary tooth, the lingual portion of the dental lamina becomes the what

A

successional lamina

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41
Q

arises by posterior growth of the general dental lamina

A

accessional lamina

42
Q

what does accessional lamina give rise to

A

molar teeth

43
Q

permanent premolars, incisors, and canines arise from

A

successional lamina

44
Q

what are the three phases of tooth eruption

A

pre-eruptive
pre-functional
functional

45
Q

movement of the developing teeth within the jawbone

A

pre-eruptive phase

46
Q

when does the pre-eruptive phase take place

A

during crown formation, before eruption

47
Q

what does pre-eruptive phase require

A

bone remodeling

48
Q

succedaneous teeth develop ___________ to primary teeth

A

lingual

49
Q

after crown formation is complete, ameloblasts secrete a _____________ over the tooth

A

dental cuticle

50
Q

the enamel organ compresses in the pre-eruptive phase to form the

A

reduced enamel epithelium

51
Q

eruptive movement of teeth into functional positions within the jaw

A

pre-funcitonal phase

52
Q

when does the pre-functional phase occur

A

after crown is complete

53
Q

when does the pre-functional phase end

A

when the tooth is fully erupted and makes contact with opposing tooth

54
Q

in the pre-functional phase the reduced enamel epithelium fuses with the ___________ lining the oral cavity

A

oral epithelium

55
Q

the reduced epithelium releases enzymes to disintegrate the __________ part of the fused tissue

A

central

56
Q

as the tooth erupts, the ________ part of the fused epithelium peels back

A

coronal

57
Q

the fused tissue that remains at the neck of the erupting tooth will form an initial ______________ around the tooth

A

junctional epithelium

58
Q

as the cusp of the tooth pierces through the fused epithelial layer, the _____________ still covers the surface of the crown

A

dental cuticle

59
Q

starts once the teeth are in occlusion

A

functional phase

60
Q

when does the completion of the root take place

A

functional phase

61
Q

when does primary dentition erupt

A

6 months to 2 years

62
Q

when does primary dentition shed

A

6 to 12 years

63
Q

when does the permanent dentition erupt

A

6 years to about 17-21 years

64
Q

what primary teeth erupt first

A

mandibular central incisors

65
Q

when do primary mandibular central incisors erupt

A

6 months

66
Q

what are the last teeth to erupt in the primary dentition

A

maxillary second molars

67
Q

when do primary maxillary second molars erupt

A

25 months

68
Q

generally speaking, when is primary eruption complete

A

30 months or 2.5 years

69
Q

what is the eruption order of the primary dentition

A

central incisors
lateral incisors
1st molars
canines
2nd molars

70
Q

when do primary mandibular central incisors erupt

A

6-10 months

71
Q

when do primary maxillary central incisors erupt

A

8-12 months

72
Q

when do primary maxillary lateral incisors erupt

A

9-13 months

73
Q

when do primary mandibular lateral incisors erupt

A

10-16 months

74
Q

when do primary maxillary 1st molars erupt

A

13-19 months

75
Q

when do primary mandibular 1st molars erupt

A

14-18 months

76
Q

when do primary maxillary canines erupt

A

16-22 months

77
Q

when do primary mandibular canines erupt

A

17-23 months

78
Q

when do primary mandibular 2nd molars erupt

A

23-31 months

79
Q

when do primary maxillary 2nd molars erupt

A

25-33 months

80
Q

what are the first primary teeth to shed

A

central incisors

81
Q

what does tooth shedding require

A

osteoclasts and odontoclasts

82
Q

resorb alveolar bone between the primary and secondary teeth

A

osteoclasts

83
Q

resorb the dentin, cementum and a portion of the enamel crown from the primary tooth

A

odontoblasts

84
Q

what permanent tooth erupts first

A

first molars

85
Q

when do permanent first molars erupt

A

6 years old

86
Q

what are the last permanent teeth to erupt

A

third molars

87
Q

when do permanent third molars erupt

A

17-21 years

88
Q

what is the eruption order for the permanent dentition

A

1st molars
central incisors
lateral incisors
mandibular canine
1st premolars
2nd premolars
maxillary canines
2nd molars
3rd molars

89
Q

when do permanent mandibular and maxillary 1st molars erupt

A

6-7 years

90
Q

when do permanent mandibular central incisors erupt

A

6-7 years

91
Q

when do permanent maxillary central incisors erupt

A

7-8 years

92
Q

when do permanent mandibular lateral incisors erupt

A

7-8 years

93
Q

when do permanent maxillary lateral incisors erupt

A

8-9 years

94
Q

when do permanent mandibular canines erupt

A

9-10 years

95
Q

when do permanent maxillary 1st premolars erupt

A

10-11 years

96
Q

when do permanent mandibular 1st premolars erupt

A

10-12 years

97
Q

when do permanent maxillary 2nd premolar erupt

A

10-12 years

98
Q

when do permanent mandibular 2nd premolars erupt

A

11-12 years

99
Q

when do permanent maxillary canines erupt

A

11-12 years

100
Q

when do permanent mandibular 2nd molars erupt

A

11-13 years

101
Q

when do permanent maxillary 2nd molars erupt

A

12-13 years

102
Q

when do permanent maxillary and mandibular 3rd molars erupt

A

17-21 years