development of occlusion in the primary and transitional dentition Flashcards
shape of the maxillary arch in children
Ovoid in shape
shape of the mandibular arch in children
V shape
do teeth push jaws appart
no, growth of mandibule is then filled with teeth
is space between baby teeth normal
No
how large is the combined mesiodistal width of the permanent incisors
Larger than the width of the primary inciors
how does the maxillary arch accomidate new teeth
Utilization of any interdental spaces betwen lateral and centrals
Utilization of max primate space betwen lateral and canine
Labial eruption of the incisors increasing arch length and circumference
Increase in width of the ental arch acros the canines
how does the mandible acccomidate new teeth
Utilization of any developmental spaces between incirors
Increase in intercanine width
how do we classify posterior occlusal relationship
by the relationship of the distal terminal planes of the upper and lower second primary molars
Flush terminal plane
Distal surfaces of opposing primary second molars are the smae verticle plane
mesial step terminal plane
mandibular is mesial to the terminal place of the maxillary primary second molar
what does mesial step correspond to
Angle Class I
what is the normal relationship of the permanent dentision
MEsial step
distal step terminal plane
MAndibular is distal to maxiary
Whis does the distal step correspond to
Angle class II
Odds of Flush terminal plane, MEsial and Distal
FLush 37%
Mesial 49%
Distal14%
end to end
Long axes of the upper and lower cnaine are in the same anteroposterior plane
Class I
Cusp tip of upper occludes the embrasure between the lower canine and lower first molar
Class II
Cusp tip of upper canine occludes mesial and lower canine in the embrasure betwen the lower canine and lateral incisors
Class III
Cups tip of upper canine occcludes distal to the embrasure between the mandibular first primary molar and canine
mesial terminal plane leads to what
Class I molar permanent molars
Flush terminal plane leads to
End to end permanent molars
Distal terminal plane leads to
class II molar permanent molars
the difference in the combined md width of the primary cnanin, first molar, second molar, and the succedaneous permanenent canine, first premolar, and second premolar
Leeway space
width of primary teeth vs three permanent teeth
primary teeth wider
what closes the primate spaces
first permanent molars slide forward, early mesial shift
what shifts more mesials, amnibles of maxillary
mandible
what does the late mesial shift allow
Allows a flush terminal plane in the mixed dentition to transition to a class II relationship
what is the late mesial shift
molars shift mesially in the mandible
appart from shift, what else determines molar position
forward Growth of the mandible in relation to the maxilla
