Flashcards in Oral Anatomy Final - Primary Dentition Deck (61)
What are the functions of primary (deciduous) teeth?
-support for lips and cheeks
-formulation of speech
-maintain arch space and room for secondary teeth
What tooth type is present in secondary dentition, but not present in primary dentition?
What range of adult teeth (in universal numbers) replace maxillary primary teeth A-J?
What range of adult teeth (in universal numbers) replace mandibular primary teeth K-T?
What is the definition of succedaneous teeth? Of non-succedaneous teeth? Give an example of a non-succedaneous tooth.
Succedaneous teeth replace primary teeth.
Non-succedaneous teeth do NOT replace primary teeth because they erupt distally to the primary teeth. All of the secondary molars are examples of non-succedaneous teeth.
When do primary teeth crowns form?
4-6 months in utero
At what age are all primary teeth erupted?
At what age are all primary roots completed?
approximately age 3
Between birth and 6 months, what teeth are erupted in the mouth?
Between 6 months and 2 years old, what teeth (in general) are erupting in the mouth?
primary teeth are erupting
From 2 to 5/6 years old, what teeth (in general) are erupted in the mouth?
only primary teeth present
Explain the "Rule of Three" for permanent dentition.
Hard tissue formation begins. After 3 years, crown formation is complete. After 3 more years, the tooth erupts. After another 3 years, the root formation is complete.
For PRIMARY teeth, at what age are crowns completely formed?
6 months (10-12 months after formation begins)
For PRIMARY teeth, at what age are roots completely formed?
1.5 to 3 years after emergence of the tooth
For PERMANENT teeth, between what ages are crowns forming/calcifying?
from birth to 16 years old
How many years prior to eruption are permanent crowns completed?
3-4 years prior to eruption
How many years after eruption are permanent roots completed?
3 years after eruption
What is the order of emergence of the primary teeth?
1. mandibular central incisors (6 months old)
2. other incisors
3. first molars
5. second molars (2 years old)
At what age do the secondary first molars erupt?
6 years old
At what age do the secondary mandibular central incisors erupt?
6 years old
Between what ages do the secondary incisors (not including mandibular central incisors) erupt?
7-9 years old
Between what ages do the secondary mandibular canines erupt?
9-10 years old
Between what ages do the secondary premolars erupt?
10-12 years old
At what age do the secondary maxillary canines erupt?
12 years old
At what age do the secondary second molars erupt?
12 years old
When do the secondary third molars typically erupt?
late teens or early 20s
In GENERAL, what arch tends to erupt first with secondary dentition?
usually mandibular arch erupts before maxillary
Which teeth (primary or secondary) are generally whiter in color?
True or false: Primary teeth have relatively long roots compared to crowns.