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23 Growth and Development > 6 - Mixed Dentition Occlusion > Flashcards

6 - Mixed Dentition Occlusion Flashcards

1
Q

does primary or permanent teeth have thinner enamel and dentin

A

primary teeth

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2
Q

do primary or permanent teeth have proportionally larger pulp chambers when compared to crown of tooth

A

primary teeth

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3
Q

pulp horns are closer to DEJ especially where

A

mesiall buccal pulp horn of primary mandibular first molars

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4
Q

do primary or perm have flatter interproximal contacts

A

primary

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5
Q

who has narrow occlusal table with less pronounced occlusal anatomy

A

primary teeth

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6
Q

what teeth has prominent cervical constriction and comparatively bulbous crown

A

primary teeth

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7
Q

are primary or perm white in color

A

primary

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8
Q

mixed dentition starts with what

A

eruption of first permanent tooth

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9
Q

mixed dentition ends with what

A

exfoliation of last primary tooth

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10
Q

mixed dentition is subdivided into what

A

early, classic, late

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11
Q

incisor transition is typically completed by what age to establish what

A

Incisor transition typically completed by 8-9 years old to establish
the “classic/stereotypical” mixed dentition stage of permanent first
molars and incisors along with primary teeth (C-D-E) in the buccal
segment

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12
Q

in non-crowded patients, should incisors be well aligned at mixed dentition stage

A

yes

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13
Q

if minor to severe crowding exists and permanent incisors are not well aligned can you expect the patient to grow out of the crowding

A

NOOO

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14
Q

what is it called when the sum total of mesial distal width of permanent incisors is greater than primary incisors

A

incisor liability

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15
Q

what is it called when the sum total of the mesial distal width of bucal segment in the primary dentition is greater than that of perm dentition

A

leeway space

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16
Q

what is the primary tooth buccal segment

A

canine, first primary molar, second primary molar

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17
Q

what is the permanent tooth buccal segment

A

canine, first premolar, second premolar

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18
Q

anterior to the 1st permanent moalr, the most tooth mass occurs during what stage

A

classic mixed dentition stage

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19
Q

average maxillary incisor liability

A

7.1 mm

20
Q

average mandibular incisor liability

A

5.1 mm

21
Q

incisor liability is overcome by what

A
  1. Interdental space in primary dentition
  2. Intercanine arch width growth
  3. Eruption path of permanent incisors
  4. Favorable size ratio between primary and permanent incisors
22
Q

transition from primary incisors to permanent incisors is possible because of what

A

Interdental spacing of primary teeth if available (Baume Type I, primate spaces)

23
Q
A
24
Q

transition from primary incisors to permanent incisors is possible because of

A
  1. increase in intercanine width thru growth
  2. more labial eruption of perm incisors increases arch perimeter (Eruption angle, angulation of long axis of tooth)
  3. size radtio between permanent incisors may be favorable or unfavorable
25
Q

mandibular intercanine growth occurs mostly when

A

during permanent incisor eruption

26
Q

maxillary intercanine growth occurs when

A

during incisor eruption and contineus

27
Q

average growth increments of lower and upper width

A

Upper width increase mean of 3.0 mm with range of 0-6.5 mm
Lower width increase mean of 2.4 mm with range of 0-5 mm

28
Q

is the amount of intercanine growth for individual patient predictable?

A

NO! unpredictable!

29
Q

does the labial eruption of permanent incisors occur routinley in max or mand arch

A

maxillary

30
Q

mandibular permanent incisors often erupt [lingual or buccal] to primary incisors (shark teeth, and usually of significant parental concern)

A

LINGUAL

31
Q

what is favorable size ratio between primary and perm

A

large primary incisors with small perm incisors

32
Q

what is unfavorable size ration between primary and perm

A

small primary incisors with large perm incisors

33
Q

during classifical mixed dention the perm incisors typically exhibit what (4)

A
  1. 1-2 mm of lower incisor crowding
  2. No spacing or crowding in the upper incisors (“Ugly duckling” stage with splayed maxillary incisors also considered a normal transitional appearance
  3. Overjet 2-4 mm overjet
  4. Overbite 10-70%
34
Q

what refer to greater M-D length of primary canine and molars when compared to permannent canine and premolars

A

leeway space

35
Q

leeway spaces on max and mand

A

max: 1 mm per quadrant
mand: 2 mm per quadrant

36
Q

Transition from primary molar occlusal relationship to permanent molar relationship is fluid ongoing process that is influenced by:

A
  1. Primary molar relationship
  2. Primary spacing (early mesial shift)
  3. Leeway space (late mesial shift)
  4. Mandibular growth (specifically differential growth of the maxilla and the mandible)
37
Q

what this:

Closing of interdental space between molars prior to eruption of permanent molars
Occurs due to eruption path of permanent molars which guide on distal roots of primary second molars
Approximately 4 years of age

A

early mesial shift

38
Q

what this:
Mesial shift of permanent first molars into leeway space when second primary molars exfoliate
Often contributes to correction of typical flush terminal plane relationship into Class I molar relationship in permanent dentition

A

late mesial shift

39
Q

More leeway space per quadrant in the mandibular
arch vs. the maxillary arch therefore mandibular
permanent molars have greater ___

A

late mesial shift

40
Q

what this:

Characteristic growth pattern at this age is for the mandible to grow more than the maxilla
Carries the mandible slightly forward relative to the maxilla during mixed dentition

A

differential mand growth

41
Q

what is :

Important predictor of final permanent molar relationship
Transition is usually accompanied by a ½ cusp (3-4mm) relative forward movement of the lower molar

A

primary molar relationship

42
Q

describe primary molar: distal step

A

usually results in full Class II perm molar

43
Q

describe primary molar: flush terminal plane with percents

A

56% convert to Class I permanent molar relationship
44% stay End-end in permanent molar relationship or shift to full class II permanent moalr relationship

44
Q

describe primary molar: mesial step w percents

A

68% convert to Class I perm moalr relationship (preffered)
19% convert to Class III perm molar relationship

45
Q

Primary molar relationship is an important ___ of final permanent molar relationship. Percentage
incidences of various outcomes do not guarantee a certain outcome for an individual patient.

A

predictor

46
Q

can you ever guarantee a particualr outcome

A

NO

23 Growth and Development (11 decks)

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