Eruption Patterns

Question 1

What is the typical eruption pattern of primary teeth?

Answer 1

abdce

Question 2

From what ages, do primary teeth erupt?

Answer 2

6 months to 2.5 years.

Question 3

What are the first permanent teeth to erupt into the mouth?

Answer 3

Upper and Lower first permanent molars
Lower centrals
All at 6 years old.

Question 4

What teeth erupt at 7 years old?

Answer 4

Upper centrals and lower laterals.

Question 5

What teeth erupt at 8 years old?

Answer 5

Upper laterals.

Question 6

When do the lower canines erupt?

Answer 6

9/10 years old.

Question 7

When do the upper canines erupt?

Answer 7

11/12 years old.

Question 8

When do the upper first premolars erupt?

Answer 8

10/11 years old.

Question 9

When do the lower first premolars erupt?

Answer 9

10-12 years old.

Question 10

When do the upper second premolars erupt?

Answer 10

10-12 years old.

Question 11

When do the lower second premolars erupt?

Answer 11

11-12 years old.

Question 12

When do the second molars erupt?

Answer 12

12-12 years old.

Question 13

When do the third molars tend to erupt?

Answer 13

17-21 years old.
Commonly missing teeth.

Question 14

Which permanent teeth are calcified before birth?

Answer 14

Only the tips of first permanent molars.

Question 15

Which primary teeth are calcified before birth?

Answer 15

1/2 of centrals and first molars.
1/3 of laterals and second molars
Tips of canines.

Question 16

What is the eruption pattern of primary teeth?

Answer 16

Centrals- 4-6 months
Laterals- 7-16 months
First molar- 13-19 months
Canine- 16-22 months
Second molars- 15-33 months

Question 17

What are some of the differences between primary and permanent teeth?

Answer 17

Primary teeth are whiter, smaller, molars are more bulbous, pulp horns extend further occlusal, ribbon shaped roots and canals, incisors are more upright, molars wider mesio-distally compared to their successors, thinner coronal dentine.

Question 18

What is anthropoid or primate spacing?

Answer 18

Spacing medially to the upper primary canine.
Spacing distally to the lower primary canine.

Question 19

What is leeway space?

Answer 19

Space occupied mesio-distally by the first and second primary molars, is wider than the space required for the first and second premolars.

Upper- 1.5mm
Lower 2.5mm

Question 20

When does the mixed dentition stage start and end?

Answer 20

Starts when the first permanent tooth erupts into the mouth and ends when the last primary tooth exfoliates.

Question 21

When is root formation complete?

Answer 21

From the date of eruption, it takes around 3 years for the permanent tooth root to complete apexogenesis.

Question 22

What are the theories for tooth eruption?

Answer 22

Dental follicle initiates osteoclastic activity of the alveolar bone.

Cellular proliferation at the apex of the tooth

Localised changed in blood pressure/hydrostatic pressure