4 - Eruption and Occlusion of Primary Dentition

Question 1

what is Baume Type I

Answer 1

2/3rd of primary dentition exhibit generalized interproximal spacing

Question 2

what is Baume Type II

Answer 2

1/3rd of primary dentition exhibit no interproximal spacing

Question 3

once established at ___ arches remain spaced or non-spaced over course of primary dentition

Answer 3

36 months

Question 4

spaced vs. non-spaced arches are related to ___ and not ___

Answer 4

related to: basal arch size
not: tooth mass differences

Question 5

what are primary spaces

Answer 5

mesial to upper primary canines (maxillary)
distal to lower primary canines (mandibular)

Question 6

are primary spaces common in Baume I or Baume II?

Answer 6

BOTH!

Question 7

what refer to the greater mesial distal length of primary canine and molars when compared to permanent canine and premolars

Answer 7

leeway space

Question 8

leeway space per max quadrant

Answer 8

1 mm

Question 9

leeway space per mandibular quadrant

Answer 9

2 mm

Question 10

are all spacing data measurements exact for each person?

Answer 10

NO! this is averaged data and won’t be specific for each patient

Question 11

if spacing is between 3-6 mm in primary, what percent of transitional crowding

Answer 11

0%

Question 12

if spacing is less than 3 mm in primary, what percent of crowding

Answer 12

20% w/ incisor crowding

Question 13

if no spacing in primary, what percent of crowding

Answer 13

50% w/ incisor crowding

Question 14

if pt has crowded primary teeth, what percent of crowding

Answer 14

100% w/ incisor crowding

Question 15

Answer 15

flush terminal plane

Question 16

Answer 16

distal terminal plane

Question 17

Answer 17

mesial step terminal plane

Question 18

what is the most common/normal terminal plane

Answer 18

flush! 76% incidence

Question 19

what are the terminal planes from most to less common

Answer 19

flush (76%) -> mesial step (14%) -> distal step (10%)

Question 20

when first perm molars erupt [mesial, distal] to primary molars, their occlusal relationship is initially determined by primary molar relationship

Answer 20

DISTAL

Question 21

final permanent molar relationship is result of what effects

Answer 21

1. early mesial shift
2. late mesial shift
3. differential mandibular growth

Question 22

what is the closing of interdental space between molars prior to eruption of perm molars

Answer 22

early mesial shift

Question 23

what occurs due to eruption path of permanent molars which guide on distal roots of primary second molars

Answer 23

early mesial shift

Question 24

at what age does early mesial shift occur

Answer 24

~4 years

Question 25

what is the mesial shift of perm first molars into leeway space when second molars exfoliate

Answer 25

late mesial shift

Question 26

what often contributes to correction of typical flush terminal plane relationship into Class I molar relationship in permanent dentition

Answer 26

late mesial shift

Question 27

since there is more leeway space per quadrant in mand arch vs. the max arch, mandibular permanent molars have ___

Answer 27

greater late mesial shift

Question 28

[max, mand] grows longer and finishes later than [max, mand]

Answer 28

mand; max

Question 29

transition is accompanied by a ___ relative forward movement of lower molar

Answer 29

1/2 cusp (3-4 mm)

Question 30

occlusion of what teeth can be used as a good predictor of sagittal relationship into permanent dentition

Answer 30

primary maxillary canines

Question 31

classifications of primary canine occlusion

Answer 31

Class I - mesial step
Class II - distal step/end-on canines
Class III - excessive mesial step

Question 32

what class:

Cusp of maxillary primary canine fits into the
embrasure mesial to the mesial buccal cusp of the
mandibular primary first molar and distal the to
cusp of mandibular primary canine

Answer 32

class I

Question 33

what class

Answer 33

class I mesial step

Question 34

what class:

Cusp of maxillary primary canine end on or mesial to cusp of mandibular primary canine

Answer 34

class II (distal step/end on canines)

Question 35

Answer 35

class II (distal step/end on canines)

Question 35

what class:

Cusp of maxillary primary canine end on or distal
to mesial buccal cusp of mandibular primary first
molar

Answer 35

class III (excessive mesial step)

Question 35

what class

Answer 35

class III excessive mesial step

Question 36

what are anterior radiographs

Answer 36

1. PA
2. max occlusal
3. mand occlusal

Question 37

whata re posterior radiographsa

Answer 37

1. PA
2. BW

Question 38

what are extra oral radiographs

Answer 38

1. PAN
2. cephalometric
3. CBCT

Question 39

anterior radiographs of primary dentition should be able to identify what

Answer 39

the four permanent incisors developing apically to primary incisors

Question 40

when looking at permanent teeth apical to primary teeth, is radiographic overlap a good predictor of future crowding

Answer 40

no

Question 41

in posterior radiographs, what must you identify?

Answer 41

presence, size, and location of permanent M and canines to aide in estimations of spacing issues and inform decisions about guidance of eruption

Question 42

examples of asymmetric eruption in primary or permanent dentition

Answer 42

supernumerary teeth, odontoma, congenitally missing tooth, and ankylosis

Question 43

ideal primary occlusion:

arch form

Answer 43

ovoid arches

Question 44

ideal primary occlusion:

spacing

Answer 44

generalized spacing including primate spaces

Question 45

ideal primary occlusion:

step relationship

Answer 45

flush terminal plane or mesial step molar

Question 46

ideal primary occlusion:

canine relationship

Answer 46

Class I canine relationship

Question 47

ideal primary occlusion:

overjet

Answer 47

2 mm

Question 48

ideal primary occlusion:

overbite

Answer 48

2 mm overbite (30%)