6 - Mixed Dentition Occlusion

Question 1

does primary or permanent teeth have thinner enamel and dentin

Answer 1

primary teeth

Question 2

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

Answer 2

primary teeth

Question 3

pulp horns are closer to DEJ especially where

Answer 3

mesiall buccal pulp horn of primary mandibular first molars

Question 4

do primary or perm have flatter interproximal contacts

Answer 4

primary

Question 5

who has narrow occlusal table with less pronounced occlusal anatomy

Answer 5

primary teeth

Question 6

what teeth has prominent cervical constriction and comparatively bulbous crown

Answer 6

primary teeth

Question 7

are primary or perm white in color

Answer 7

primary

Question 8

mixed dentition starts with what

Answer 8

eruption of first permanent tooth

Question 9

mixed dentition ends with what

Answer 9

exfoliation of last primary tooth

Question 10

mixed dentition is subdivided into what

Answer 10

early, classic, late

Question 11

incisor transition is typically completed by what age to establish what

Answer 11

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

Question 12

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

Answer 12

yes

Question 13

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

Answer 13

NOOO

Question 14

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

Answer 14

incisor liability

Question 15

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

Answer 15

leeway space

Question 16

what is the primary tooth buccal segment

Answer 16

canine, first primary molar, second primary molar

Question 17

what is the permanent tooth buccal segment

Answer 17

canine, first premolar, second premolar

Question 18

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

Answer 18

classic mixed dentition stage

Question 19

average maxillary incisor liability

Answer 19

7.1 mm

Question 20

average mandibular incisor liability

Answer 20

5.1 mm

Question 21

incisor liability is overcome by what

Answer 21

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

Question 22

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

Answer 22

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

Question 23

Answer 23

Question 24

transition from primary incisors to permanent incisors is possible because of

Answer 24

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

Question 25

mandibular intercanine growth occurs mostly when

Answer 25

during permanent incisor eruption

Question 26

maxillary intercanine growth occurs when

Answer 26

during incisor eruption and contineus

Question 27

average growth increments of lower and upper width

Answer 27

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

Question 28

is the amount of intercanine growth for individual patient predictable?

Answer 28

NO! unpredictable!

Question 29

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

Answer 29

maxillary

Question 30

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

Answer 30

LINGUAL

Question 31

what is favorable size ratio between primary and perm

Answer 31

large primary incisors with small perm incisors

Question 32

what is unfavorable size ration between primary and perm

Answer 32

small primary incisors with large perm incisors

Question 33

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

Answer 33

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%

Question 34

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

Answer 34

leeway space

Question 35

leeway spaces on max and mand

Answer 35

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

Question 36

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

Answer 36

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)

Question 37

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

Answer 37

early mesial shift

Question 38

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

Answer 38

late mesial shift

Question 39

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

Answer 39

late mesial shift

Question 40

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

Answer 40

differential mand growth

Question 41

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

Answer 41

primary molar relationship

Question 42

describe primary molar: distal step

Answer 42

usually results in full Class II perm molar

Question 43

describe primary molar: flush terminal plane with percents

Answer 43

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

Question 44

describe primary molar: mesial step w percents

Answer 44

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

Question 45

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.

Answer 45

predictor

Question 46

can you ever guarantee a particualr outcome

Answer 46

NO