Development of the Primary & Permanent Dentition (Part 1) Flashcards
How many teeth are present in the deciduous dentition?
20
The permanent molars erupt ____ to the primary dentition. This results in _____
distally; mixed dentition
The eruption of permanent teeth occurs from ages:
6 to 13 years old
How many teeth are present in the permanent dentition?
32
Symmetrical crown shapes are seen in:
primary dentition
In the primary dentition, larger spaces called _____ are found mesial to upper cuspids and distal to lower cuspids
“primate” spaces
Where are the primate spaces in the lower primary dentition?
Distal to lower cuspids
Where are the primate spaces in the upper primary dentition?
Mesial to upper cuspids
What can be seen in the image below?
Primate spaces
Rule #1 states that if there is NO interdental spacing in the deciduous dentition:
Crowding of the permanent dentition will most probably occur
What is the probability that crowding will occur in the permanent dentition if there is NO interdental spacing in the deciduous dentition?
75%
What can be seen in the image below?
Ectopic eruption of mandibular central incisors
A feature that is important to get space for permanent incisor eruption:
Diastemas between anterior primary teeth
The upper incisors erupt to the ____ of primary teeth
The lower incisors tend to erupt to the _____ of primary teeth
labial; lingual
T/F: There is no significant increase in arch size after the eruption of the permanent incisors
True
Unlike the permanent dentition in primary dentition there is no _____ of the incisors
angulation
What is seen in this image?
Primary teeth = no angulation
Anterior primary teeth are ____ than permanent
smaller
T/F: Some primary posterior teeth are larger than their successor
True
Give an example a maxillary primary tooth that is larger than its successor:
Upper second primary molar (8.2 mm) is replaced with upper second premolar (7.0 mm)
Give an example of a mandibular primary tooth that is larger than its successor:
Lower second primary molar (9.9 mm) us replaced with lower second premolar (7.0 mm)