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D2: 622 Pediatric Dentistry > 05 Development of Dentition > Flashcards

05 Development of Dentition Flashcards

1
Q

When does the calcification of the primary teeth begin?

A

3.5-4.5 months after conception

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2
Q

The first teeth to erupt are the mandibular centrals, what age?

A

6-7 months

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3
Q

What tooth is the last to erupt? What month does this happen?

A

Maxillary 2nd Molar (AJ)

26 months

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4
Q

Which dentition shows less variability

A

Primary

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5
Q

The primary occlusion changes in order to adapt to these two things

A

Skeletal growth

Occlusal wear

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6
Q

At what stages of dental calcification and development are girls more advanced than boys?

A

All stages

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7
Q

When do teeth start to move occlusally

A

Not until crown formation is complete

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8
Q

What physical characteristic of teeth is determined genetically

A

Tooth size

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9
Q

There are relationships between these three genetically related conditions

A

Dental agenesis

Delayed development

Diminished size of teeth

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10
Q

Which condition is more likely:

Congenitally missing teeth or Supernumerary teeth?

A

Congenitally missing

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11
Q

Are congenitally missing teeth more likely in boys or girls

A

boys

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12
Q

Are changes in the width of the dental arch timed more closely to dental development or skeletal growth?

A

Dental development

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13
Q

When does dental arch circumference decrease?

A

During the late transitional and early permanent dentition

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14
Q

What surfaces are determinant factors in the initial permanent molar occlusion?

A

Distal of primary 2nd molars

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15
Q

Which teeth show the greatest variability in development

A

3rd moalrs

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16
Q

What is the order of calcification of primary teeth?

A

A, B, C, D, E

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17
Q

What is ABCDE

A 
A = Centrals
B = Laterals
C = Canines
D = First Molars
E = 2nd Molars
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18
Q

In what order do the cusps of posterior teeth calcify?

A

MB
ML
DB
DL

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19
Q

How many calcification centers are there in anterior teeth

A

one

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20
Q

Which tooth erupts at 6 months

A

Mn Centrals

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21
Q

Eruption = 7 Months

A

Mn Lats

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22
Q

Eruption = 7.5 Months

A

Mx Centrals

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23
Q

Eruption = 9 Months

A

Mx Lats

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24
Q

Eruption = 12 Months

A

Mn 1st Molar

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25
Q

Eruption = 14 Months

A

Mx 1st Molar

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26
Q

Eruption = 16 Months

A

Mn Canine

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27
Q

Eruption = 18 Months

A

Mx Canine

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28
Q

Eruption = 20 Months

A

Mn 2nd Molar

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29
Q

Eruption = 24 Months

A

Mx 2nd Molar

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30
Q

Initiation times for permanent Centrals, Lats, Canines, 1st PMs

A

5 months IU

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31
Q

Initiation times for 2nd Premolars

A

10 months PP

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32
Q

Initiation times for 1st Molars

A

20 weeks IU

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33
Q

Initiation times for 2nd molars

A

12 months PP

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34
Q

Initiation times for 3rd molars

A

5 years PP

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35
Q

What is the length of time for root completion for primary teeth?

A

18 months Post eruption

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36
Q

What is the length of time for root completion for permanent teeth

A

3 years post eruption

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37
Q

What is the range of eruption times for primary teeth

A

6 months to 24-36 months

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38
Q

Only 1% of kids don’t have their first tooth by this age

A

12 months

39
Q

Only 1% of kids have a tooth before this age

A

4 months

40
Q

By the age of 12 months, the average kid has this many teeth

A

6-8

41
Q

Rarely do kids have less that this many teeth at 12 months

A

2

42
Q

Rarely do kids have more than this many teeth at 12 months

A

10

43
Q

90% of all kids have all of their primary teeth by this age

A

3 years

44
Q

why is the sequence of eruption more important that the time of eruption

A

it determines the position of the teeth in the arch

45
Q

What conditions that have anecdotally been related to teething have been proven to be unrelated to teething?

A

Respiratory infections
Fever convulsions
Bronchitis
Exczema

46
Q

60 % of infants exhibit these symptoms before and after eruption

A

Rhinorrhea
Irritability
Diarrhea

47
Q

Macknin et al found the following symptoms significantly associated with teething

A 
Increased biting
Drooling
Gum rubbing
Sucking irratability
Wakefulness
Ear rubbing
Facial rash
Decreased appetite for solid foods
Mild Fever (<101)
48
Q

We should know the liquid that is contained in these common child products

A

Teething rings

49
Q

What treatment is needed for an eruption hematoma

A

None!

50
Q

What are neonatal teeth

A

Teeth that erupt within the first 30 days of life

51
Q

What are premature teeth

A

Teeth erupted earlier than 3 months of age

52
Q

What are natal teeth

A

Teeth that have erupted before birth

53
Q

What is more common, natal teeth or neonatal teeth

A

Natal 3:1

54
Q

How common/rare are natal teeth

A

1:2000

55
Q

What percent of natal teeth are true primary teeth

A

90%

56
Q

What condition is associated with Natal/Neonatal Teeth

A

Riga-Fede Disease

57
Q

What is Riga-Fede Disease

A

Tongue trauma from feeding

58
Q

What two syndromes are associated with natal and neonatal teeth

A

Chondroectodermal Dysplasia

Cleft lip and palate

59
Q

What is another name for Chondroectodermal Dysplasia

A

Ellis-van Creveld

60
Q

What is Chondroectodermal Dysplasia

A

Inherited bone growth disorder that can cause dwarfism and tooth deformity

61
Q

What are three structures in newborns that can be confused for neonatal teeth

A

Dental lamina cysts

Bohn’s nodules

Epstein’s Pearls

62
Q

Is Baume Type I spaced or not spaced

A

Spaced

63
Q

Where are the maxillary primate spaces

A

Mesial of canine

64
Q

Where are the mandibular primate spaces

A

Distal to canines

65
Q

Why are the primate spaces important

A

Canine and bicuspid eruption

66
Q

Does the total interdental spacing between primary teeth increase or decrease with age?

A

Decrease

67
Q

What is the most common terminal plane relationship

A

Mesial (60%) Class I

68
Q

What does the Primary Molar Terminal Plane help determine

A

Transitional occlusal pattern of the permanent molars

69
Q

How is the orientation of primary incisors different from permanent incisors

A

Primary = Upright with little overbite and overjet

Perm = Labial angulation and greater overbite and overjet

70
Q

Why does the intercanine width of the mandibular arch increase only slightly with the eruption of the permanent incisors

A

Due to the divergent nature of the distal movement of the primary canine into the primate spaces

71
Q

What is the leeway space of Nance

A

the combined mesio-distal widths of deciduous canines and molars differ from those of permanent canines and premolars by 0.9 mm in Mx and 1.7 mm in Mn

72
Q

What is the early mesial shift?

A

The eruptive force of the permanent molar causes the generalized spacing to close allowing the permanent molar to shift into a class I occlusion

73
Q

When does the late mesial shift happen

A

when no primate spaces exist the shift occurs when the second primary molar exfoliates in the mandible before the maxilla

74
Q

What should we know about Anodontia

A

That if you are missing the primary tooth completely, you will never develop the permanent tooth

75
Q

Histopathology Initiation

A

Problems of tooth #

76
Q

Histopath Proliferation

A

Problems of tooth #, size, proportion, twinning

77
Q

Histopath Histodifferentiation

A

Problems of enamel and dentin

78
Q

Histopath Morphodifferentiation

A

Problems of size, shape

79
Q

Histopath Appostition

A

Enamel hypoplasia, dentin dysplasia, hypercementosis, enamel pearls

80
Q

Histopath Mineralization and Maturation

A

Flourosis, localized hypomineralizaton, interglobular dentin

81
Q

Anomolies of Initiation and Proliferation

A

Hyperdontia
Hypodontia
Anodontia

82
Q

What syndromes are associated with Hyperdontia

A 
Apert
Cleidocranial dysplasia
Gardner's
Crouzon's
Down's
83
Q

What syndromes are associated with Hypodontia and Anodontia

A

ED
Crouzon’s
Achondroplasia
Ellis Van Creveld

84
Q

Which teeth are the most frequently congenitally absent

A

3rd Molars
Mn 2nd Premolars
Mx Lats
Mx 2nd premolars

85
Q

Anomalies of Proliferation and Morphodifferentiation

A

Microdontia

Macrodontia

86
Q

Most frequent Microdontia teeth

A

Laterals
2nd PM
3rd Molars

87
Q

Conditions with Microdontia

A 
ED
Ellis Van Creveld
Hemifacial microsomia
Down
Crouzon
88
Q

Conditions with Macrodontia

A

Hemifacial hypertrophy
Crouzon
Otodental Syndrom

89
Q

Anomalies of Proliferation and Morphodifferentiation 2

A

Gemination
Twinning
Fusion
Concrescence

90
Q

What is gemination

A

Single pulp, split crown, more common in primary

91
Q

What is Twinning

A

Single bud w/supernumerary image

2 separate crowns

92
Q

What is fusion

A

more common in primary teeth

2 separate pulp chambers

93
Q

What is concrescence

A

Fusion that occurs after root formation is completed

94
Q

Anomalies in Morphodifferentiation

A

Dens Invaginatus
Den Evaginatus (Talon Cusp)
Taurodontism
Dilaceration

D2: 622 Pediatric Dentistry (9 decks)

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