Development of the Primary and permanent dentition Part I Flashcards
how many teeth are there in the deciduous dentition
20 teeth
first molars erupt ______ to the primary dentition
distal
what age do the permanent teeth erupt
6-13 years old
how many teeth are in the permanent dentition
32
what is the eruption pattern of the mandibular arch
- central incisor: 6-10 months
- lateral incisor: 10-16 months
- first molar: 14-18 months
- canine: 17-23 months
- second molar: 23-31 months
what is the exfoliation pattern of the mandibular arch
- central incisor: 6-7 years
- lateral incisor: 7-8 years
- first molar: 9-11 years
- canine: 9-12 years
- second molar 10-12 years
what is the emergence pattern of the maxillary arch
- central incisor: 8-12 months
- lateral incisor: 9-12 months
- first molar: 13-19 months
- canine: 16-22 months
- second molar: 25-33 months
what is the exfoliation pattern of the maxillary arch
- central incisor: 6-7 years
- lateral incisor: 7-8 years
- first molar: 9-11 years
- canine: 10-12 years
- second molar: 10-12 years
where are primate spaces found
mesial to upper cuspids and distal to lower cuspids
what is the probability that if there is no interdental spacing in the deciduous dentition that there will be crowding in the permanent dentition
75%
_____ between anterior primary teeth are important to get space for permanent incisor eruption
diastemas
the upper incisors erupt _____ of primary teeth
labial
the lower incisors erupt ______ of the primary teeth
lingual
there is ________ in arch size after the eruption of the permanent incisors
no significant increase
are the primary incisors angled
no
the crown shapes are _____
symmetrical
anterior teeth are _____ than permanent teeth
smaller
some primary posterior teeth are _____ than their successor
larger
how big is the upper second premolar
7mm
how big is the upper second primary molar
8.2mm
how big is the lower second premoalr
7mm
how big is the lower second primary molar
9.9mm
what is the occlusal plane
an imaginary surface that passes through the occlusion of the teeth
describe the occlusal plane
usually curved and is not a plan but approximated by a straight line in the lateral view based on specific reference points within the dental arches
where does the maxillary occlusal plane pass thorugh
the occlusal cups of the posterior teeth and the incisal edges of the maxillary incisors
where does the mandibular occlusal plane pass through
tangent to the occlusal cusps of the posterior teeth and the incisal edges of the mandibular incisors
primary teeth are positioned ____ _to the occlusal plane
90 degrees
are permanent teeth positioned 90 degrees to the occlusal plane
no
what part of the permanent tooth pushes out the primary tooth
the follicle
what is the curve of spee
the curve displayed in the sagittal plane (parallel with the body of the mandible) by the cusps and incisal edges of the mandibular teeth. the convex aspect of the curve of spee is pointing inferiorly
at what age is the intercanine width of the mandible established
8-9 years old
who developed the curve of spee and what was their original idea
F. Graf Von Spee in 1890
- theorized that the extension of this curve would be tangent to the anterior surface of the mandibular condyles bilaterally
in the primary dentition the curve of spee is:
flat
if a malocclusion is diagnoses in the primary dentition it will probably:
get worse during growth
what are the occlusal relations in the deciduous dentition
- upper and lower incisors are vertical
- minimal overbite and overjet
- upper canine tip is positioned in the embrasure between the lower canine and the first primary molar
what is overjet
the distance between the labial surface of the mandibular incisors and the labial aspect of the incisal edge of the maxillary incisors usually measured parallel to the occlusal plane
when not otherwise specified the term “overjet” is assumed to refer to:
the most prominent central incisors
the extend of the overjet is determined primarily by:
the differences of labiolingual position and inclination of the maxillary and mandibular central incisors
how often is the anteroposterior skeletal relationship reflected directly in the amount of overjet
only in a minority of cases
the first primary tooth appears around the age of_____ and by ______ all primary teeth should be present.
8 months, 30 months
