Chronology Of Tooth Development

Question 1

What tooth do you look at first when looking at an x-ray to determine dental age?

Answer 1

Mandibular first molar

Question 2

When have all the deciduous teeth erupted by?

Answer 2

2.5 years/30 months

Question 3

When have all the deciduous teeth completely developed by?

Answer 3

3 years

Question 4

How long do the roots of deciduous teeth take to complete after eruption?

Answer 4

1.5 years

Question 5

How long do the roots of permanent teeth take to complete after eruption?

Answer 5

3 years

Question 6

When have all the permanent incisors erupted by?

Answer 6

9 years old

Question 7

By what age is the permanent first molar completely formed?

Answer 7

9-10 years old

Question 8

How much of the root has developed when a tooth erupts?

Answer 8

2/3

Question 9

How can you tell what part of the tooth is the root on an x-ray?

Answer 9

Not covered by enamel

Question 10

How do you know a root is completed on an x-ray?

Answer 10

No radiolucency

Tapers to a point

Question 11

When is the crown of a wisdom tooth completed?

Answer 11

12-16 years old

Question 12

When do the wisdom teeth erupt?

Answer 12

17-21 years old

Question 13

When are the wisdom teeth completely developed?

Answer 13

18-25 years old

Question 14

When do the maxillary and mandibular permanent lateral incisors start calcification?

Answer 14

Maxillary: 10-12 months

Mandibular: 3-4 months

Question 15

When is the crown of a permanent first molar complete?

Answer 15

2.5-3 years old

Question 16

By what age have all the deciduous teeth started calcification?

Answer 16

7 months in utero

Question 17

By what age are all the deciduous teeth crowns completed?

Answer 17

1 year

Question 18

In what order do the deciduous teeth erupt?

Answer 18

A B D C E

Question 19

At what age do the second molars erupt?

Answer 19

12-13 years

Question 20

By what age are the crowns of the permanent incisors complete?

Answer 20

4-5 years

Question 21

By what age are the crowns of the permanent canines complete?

Answer 21

6-7 years

Question 22

By what age are the crowns of the permanent first premolars complete?

Answer 22

5-6 years

Question 23

By what age are the crowns of the permanent second premolars complete?

Answer 23

6-7 years

Question 24

By what age are the crowns of the permanent second molars complete?

Answer 24

7-8 years

Question 25

By what age is the first deciduous crown complete?

Answer 25

4 months (central incisors)

Question 26

By what age are the deciduous canine crowns complete?

Answer 26

9 months

Question 27

By what age are the deciduous first molar crowns complete?

Answer 27

6 months

Question 28

By what age are the deciduous incisors complete?

Answer 28

1.5-2 years

Question 29

When do the permanent central incisors erupt?

Answer 29

Maxillary: 7-8 years Mandibular: 6-7 years

Question 30

When do the permanent lateral incisors erupt?

Answer 30

Maxillary: 8-9 years Mandibular: 7-8 years

Question 31

When do the permanent canines erupt?

Answer 31

Maxillary: 11-12 years Mandibular: 9-10 years

Question 32

For each of the anterior teeth, is it usually the maxillary or mandibular that erupt first?

Answer 32

Mandibular erupts first

Question 33

When do the permanent first premolars erupt?

Answer 33

Maxillary: 10-11 years Mandibular: 10-12 years

Question 34

When do the permanent second premolars erupt?

Answer 34

Maxillary: 10-12 years Mandibular: 11-12 years

Question 35

When do the permanent second molars erupt?

Answer 35

12-13 years

Question 36

When do the wisdom teeth start calcification?

Answer 36

Maxillary: 7-9 years Mandibular: 8-10 years