L.2 Development of the Dentition 2 Flashcards
Spacing is good yo: more than 6mm will mean a __% chance of crowding in the permanent dentition
0%
Spacing of __-__mm in the primary dentition yields a 205 chance of crowding in the permanent dentition
3-6mm
Spacing of less than 3mm in the primary dentition yields __% probability of crowding in the permanent arch.
50%
What is the % chance of crowding in the permanent teeth id there is no spacing in the primary teeth? crowding in the primary??
no spacing 66%, crowding 100%!
Where are the two primate spaces?
mesial to the maxillary canine and distal to the mandibular canine
What is the ideal occlusion for primary teeth? What permanent class occlusal relationship will it led to ?
mesial step…class I
an exaggerated mesial step occlusion in primary teeth is most likely to lead to which class occlusion in the permanent occlusion?
class III
a distal step occlusal relationship in primary teeth is most likely to lead to what class permanent occlusal relationship?
class II
What are the ideal overbites and over jets?
2mm for both
When is the greatest spacing for primary teeth?
3-4 years old
Your strong point lol….MIXED DENTITION!!! Early- __-__ years old = incisors and first molars
6-9 years old
Your strong point lol….MIXED DENTITION!!! Late- ___-___ years old = canines, 1st, 2nd PMs
9-12 y/o
SO covering both early and late mixed dentition it is from the ages of ___-___
6-12 yo
ERUPTION FOLLOWS EXFOLIATION BY HOW LONG?
6 months
Enamel of permanent tooth complete about ___ years prior to eruption
3 years
Root formation complete about __ years after eruption (permanent teeth)
3 years
Eruptive force of _______ (the freaking KEY to space mgmt) closes spaces between remaining primary molars
1st permanent molar
What are the two most common primary types of occlusion?
1.mesial step (49%) 2. flush (37%)
In an Angle Class I, the chin grows in which direction?
downward and outward
In an Angle Class II, the chin grows in more of a _____ direction.
downward (vertical)
In an angle class III, the chin grows in more of a ______ direction.
horizontal
How much larger are the maxillary permanent incisors than the primaries?
7.6mm larger
How much larger are the mandibular permanent incisors than the primaries?
6.0mm larger
What % of 6 year olds have a diastema when their maxillary centrals erupt?
44-97%!!! NORMAL
What are two reasons for diastema if it is not normal?
habit or frenum
What is the eruption sequence of the permanent maxillary teeth? How is it different from mandibular?
6-1-2-4-5-3-7-8 (mandibular is MUCH MORE ORDERLY because the canine plays nice…6-1-2-3-4-5-6-7-8)
What is the name for tooth size difference between the primary canines and molars and the permanent successors.
LEEWAY SPACE
The difference in primary space and permanent space on the maxilla is ____mm per quadrant
1.5mm per quadrant
The difference in primary space and permanent space on the mandible is ____mm per quadrant
2.5mm
What is the majority of leeway space caused by?
E space (primary second molar)
What is the normal E space on the max and mand?
max 1.5mm mand 2.0mm
**At birth, the only permanent teeth that show traces of hard tissue formation are the ____________
first permanent molars
With the exception of the third molars, all permanent teeth demonstrate hard tissue formation at @ ___ years of age…BUT when do the whizzy’s come in?
3 years…whizzy at 8 years
Permanent initiation of teeth is at ___ weeks In Utero
20 weeks
The permanent 1st molar first molar initiates at ___ months In Utero
5 months
Permanent anterior teeth begin developing _______ to the incisal level of the primary teeth
LINGUAL
As primary teeth erupt, the permanent successors are positioned lingual to the ______ third of their roots.
APICAL
Premolars SHIFT from a location near the _______ area of the primary molars to a location enclosed within the _____ of the primary molars.
occlusal…..roots
