Development of the dentition Flashcards
What are the stages of dental development
-Newborn
-Primary dentition
-Mixed dentition
-Permanent dentition
Intra oral view of newborn dentitions
Gum pads:
Upper - semi circular
Lower - ‘U’ shaped
‘Anterior open bite’
What are the anterior/posterior jaw relationships
Skeletal class 1
-mandible is 2-3mm posterior to the maxilla
Skeletal class 2
– mandible is retruded relative to the maxilla
Skeletal class 3
– mandible is protruded relative to the maxilla
What is the name for teeth present prior to birth
Natal teeth
What is the name for teeth which erupt not long after birth
Neo-natal teeth
What is a unilateral cleft lip
Cleft lip affecting only one side
When is a cleft lip usually repaired
3-6 months
Why are the lips and palate repaired so quickly
Prevent impairment of speech
When do primary dentition erupt
6 months - 3 yrs
Which teeth usually erupt first
Lowers a-b-d-c-e
What is the general time frame for each primary tooth
a 6-7 mths
b 7-8 mths
c 18-20 mths
d 12-15 mths
e 24-36 mths
What are key characteristics of primary dentition
Incisors more upright than permanent dentition
Spaced
Often marked wear towards the end
Why is spacing preferred in primary dentition
No spacing - 66% crowding
> 6mm spacing - no crowding
When does mixed dentition occur
6 - 13 yrs
What is the usual increase in inter-canine width of the maxilla and mandible
3.5mm - maxilla
3 mm - mandible
