05 Development of Dentition Flashcards Preview

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

Flashcards in 05 Development of Dentition Deck (94):
1

When does the calcification of the primary teeth begin?

3.5-4.5 months after conception

2

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

6-7 months

3

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

Maxillary 2nd Molar (AJ)

26 months

4

Which dentition shows less variability

Primary

5

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

Skeletal growth

Occlusal wear

6

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

All stages

7

When do teeth start to move occlusally

Not until crown formation is complete

8

What physical characteristic of teeth is determined genetically

Tooth size

9

There are relationships between these three genetically related conditions

Dental agenesis

Delayed development

Diminished size of teeth

10

Which condition is more likely:

Congenitally missing teeth or Supernumerary teeth?

Congenitally missing

11

Are congenitally missing teeth more likely in boys or girls

boys

12

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

Dental development

13

When does dental arch circumference decrease?

During the late transitional and early permanent dentition

14

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

Distal of primary 2nd molars

15

Which teeth show the greatest variability in development

3rd moalrs

16

What is the order of calcification of primary teeth?

A, B, C, D, E

17

What is ABCDE

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

18

In what order do the cusps of posterior teeth calcify?

MB
ML
DB
DL

19

How many calcification centers are there in anterior teeth

one

20

Which tooth erupts at 6 months

Mn Centrals

21

Eruption = 7 Months

Mn Lats

22

Eruption = 7.5 Months

Mx Centrals

23

Eruption = 9 Months

Mx Lats

24

Eruption = 12 Months

Mn 1st Molar

25

Eruption = 14 Months

Mx 1st Molar

26

Eruption = 16 Months

Mn Canine

27

Eruption = 18 Months

Mx Canine

28

Eruption = 20 Months

Mn 2nd Molar

29

Eruption = 24 Months

Mx 2nd Molar

30

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

5 months IU

31

Initiation times for 2nd Premolars

10 months PP

32

Initiation times for 1st Molars

20 weeks IU

33

Initiation times for 2nd molars

12 months PP

34

Initiation times for 3rd molars

5 years PP

35

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

18 months Post eruption

36

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

3 years post eruption

37

What is the range of eruption times for primary teeth

6 months to 24-36 months

38

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

12 months

39

Only 1% of kids have a tooth before this age

4 months

40

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

6-8

41

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

2

42

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

10

43

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

3 years

44

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

it determines the position of the teeth in the arch

45

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

Respiratory infections
Fever convulsions
Bronchitis
Exczema

46

60 % of infants exhibit these symptoms before and after eruption

Rhinorrhea
Irritability
Diarrhea

47

Macknin et al found the following symptoms significantly associated with teething

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

48

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

Teething rings

49

What treatment is needed for an eruption hematoma

None!

50

What are neonatal teeth

Teeth that erupt within the first 30 days of life

51

What are premature teeth

Teeth erupted earlier than 3 months of age

52

What are natal teeth

Teeth that have erupted before birth

53

What is more common, natal teeth or neonatal teeth

Natal 3:1

54

How common/rare are natal teeth

1:2000

55

What percent of natal teeth are true primary teeth

90%

56

What condition is associated with Natal/Neonatal Teeth

Riga-Fede Disease

57

What is Riga-Fede Disease

Tongue trauma from feeding

58

What two syndromes are associated with natal and neonatal teeth

Chondroectodermal Dysplasia

Cleft lip and palate

59

What is another name for Chondroectodermal Dysplasia

Ellis-van Creveld

60

What is Chondroectodermal Dysplasia

Inherited bone growth disorder that can cause dwarfism and tooth deformity

61

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

Dental lamina cysts

Bohn's nodules

Epstein's Pearls

62

Is Baume Type I spaced or not spaced

Spaced

63

Where are the maxillary primate spaces

Mesial of canine

64

Where are the mandibular primate spaces

Distal to canines

65

Why are the primate spaces important

Canine and bicuspid eruption

66

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

Decrease

67

What is the most common terminal plane relationship

Mesial (60%) Class I

68

What does the Primary Molar Terminal Plane help determine

Transitional occlusal pattern of the permanent molars

69

How is the orientation of primary incisors different from permanent incisors

Primary = Upright with little overbite and overjet

Perm = Labial angulation and greater overbite and overjet

70

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

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

71

What is the leeway space of Nance

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

What is the early mesial shift?

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

When does the late mesial shift happen

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

74

What should we know about Anodontia

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

75

Histopathology Initiation

Problems of tooth #

76

Histopath Proliferation

Problems of tooth #, size, proportion, twinning

77

Histopath Histodifferentiation

Problems of enamel and dentin

78

Histopath Morphodifferentiation

Problems of size, shape

79

Histopath Appostition

Enamel hypoplasia, dentin dysplasia, hypercementosis, enamel pearls

80

Histopath Mineralization and Maturation

Flourosis, localized hypomineralizaton, interglobular dentin

81

Anomolies of Initiation and Proliferation

Hyperdontia
Hypodontia
Anodontia

82

What syndromes are associated with Hyperdontia

Apert
Cleidocranial dysplasia
Gardner's
Crouzon's
Down's

83

What syndromes are associated with Hypodontia and Anodontia

ED
Crouzon's
Achondroplasia
Ellis Van Creveld

84

Which teeth are the most frequently congenitally absent

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

85

Anomalies of Proliferation and Morphodifferentiation

Microdontia
Macrodontia

86

Most frequent Microdontia teeth

Laterals
2nd PM
3rd Molars

87

Conditions with Microdontia

ED
Ellis Van Creveld
Hemifacial microsomia
Down
Crouzon

88

Conditions with Macrodontia

Hemifacial hypertrophy
Crouzon
Otodental Syndrom

89

Anomalies of Proliferation and Morphodifferentiation 2

Gemination
Twinning
Fusion
Concrescence

90

What is gemination

Single pulp, split crown, more common in primary

91

What is Twinning

Single bud w/supernumerary image

2 separate crowns

92

What is fusion

more common in primary teeth

2 separate pulp chambers

93

What is concrescence

Fusion that occurs after root formation is completed

94

Anomalies in Morphodifferentiation

Dens Invaginatus
Den Evaginatus (Talon Cusp)
Taurodontism
Dilaceration