4 - Eruption and Occlusion of Primary Dentition Flashcards

1
Q

what is Baume Type I

A

2/3rd of primary dentition exhibit generalized interproximal spacing

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2
Q

what is Baume Type II

A

1/3rd of primary dentition exhibit no interproximal spacing

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3
Q

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

A

36 months

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4
Q

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

A

related to: basal arch size
not: tooth mass differences

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5
Q

what are primary spaces

A

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

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6
Q

are primary spaces common in Baume I or Baume II?

A

BOTH!

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7
Q

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

A

leeway space

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8
Q

leeway space per max quadrant

A

1 mm

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9
Q

leeway space per mandibular quadrant

A

2 mm

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10
Q

are all spacing data measurements exact for each person?

A

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

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11
Q

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

A

0%

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12
Q

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

A

20% w/ incisor crowding

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13
Q

if no spacing in primary, what percent of crowding

A

50% w/ incisor crowding

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14
Q

if pt has crowded primary teeth, what percent of crowding

A

100% w/ incisor crowding

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15
Q
A

flush terminal plane

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16
Q
A

distal terminal plane

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17
Q
A

mesial step terminal plane

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18
Q

what is the most common/normal terminal plane

A

flush! 76% incidence

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19
Q

what are the terminal planes from most to less common

A

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

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20
Q

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

A

DISTAL

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21
Q

final permanent molar relationship is result of what effects

A
  1. early mesial shift
  2. late mesial shift
  3. differential mandibular growth
22
Q

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

A

early mesial shift

23
Q

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

A

early mesial shift

24
Q

at what age does early mesial shift occur

25
what is the mesial shift of perm first molars into leeway space when second molars exfoliate
late mesial shift
26
what often contributes to correction of typical flush terminal plane relationship into Class I molar relationship in permanent dentition
late mesial shift
27
since there is more leeway space per quadrant in mand arch vs. the max arch, mandibular permanent molars have ___
greater late mesial shift
28
[max, mand] grows longer and finishes later than [max, mand]
mand; max
29
transition is accompanied by a ___ relative forward movement of lower molar
1/2 cusp (3-4 mm)
30
occlusion of what teeth can be used as a good predictor of sagittal relationship into permanent dentition
primary maxillary canines
31
classifications of primary canine occlusion
Class I - mesial step Class II - distal step/end-on canines Class III - excessive mesial step
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
class I
33
what class
class I mesial step
34
what class: Cusp of maxillary primary canine end on or mesial to cusp of mandibular primary canine
class II (distal step/end on canines)
35
class II (distal step/end on canines)
35
what class: Cusp of maxillary primary canine end on or distal to mesial buccal cusp of mandibular primary first molar
class III (excessive mesial step)
35
what class
class III excessive mesial step
36
what are anterior radiographs
1. PA 2. max occlusal 3. mand occlusal
37
whata re posterior radiographsa
1. PA 2. BW
38
what are extra oral radiographs
1. PAN 2. cephalometric 3. CBCT
39
anterior radiographs of primary dentition should be able to identify what
the four permanent incisors developing apically to primary incisors
40
when looking at permanent teeth apical to primary teeth, is radiographic overlap a good predictor of future crowding
no
41
in posterior radiographs, what must you identify?
presence, size, and location of permanent M and canines to aide in estimations of spacing issues and inform decisions about guidance of eruption
42
examples of asymmetric eruption in primary or permanent dentition
supernumerary teeth, odontoma, congenitally missing tooth, and ankylosis
43
ideal primary occlusion: arch form
ovoid arches
44
ideal primary occlusion: spacing
generalized spacing including primate spaces
45
ideal primary occlusion: step relationship
flush terminal plane or mesial step molar
46
ideal primary occlusion: canine relationship
Class I canine relationship
47
ideal primary occlusion: overjet
2 mm
48
ideal primary occlusion: overbite
2 mm overbite (30%)