Tooth morphology

Question 1

How many teeth make up primary dentition

Answer 1

20

Question 2

How many teeth make up the secondary dentition

Answer 2

31

Question 3

By what age is the primary arch fully erupted

Answer 3

3 years

Question 4

When does the first permanent tooth usually erupt

Answer 4

6 years

Question 5

By what is the the secondary arch fully erupted

Answer 5

Around 18 years

Question 6

Describe some differences between the size of primary and deciduous

Answer 6

Generally deciduous teeth are smaller except for molars compared to permanent premolars

Question 7

Which teeth are present in the permanent dentition and not in the deciduous dentition

Answer 7

Deciduous dentition has no premolars or third molars

Question 8

Name the first tooth that erupts in the deciduous tooth

Answer 8

Mandibular incisor

Question 9

Name the first tooth that erupts in the permanent tooth

Answer 9

Mandibular 1st molar

Question 10

What colour are deciduous teeth compared to permanent teeth

Answer 10

Deciduous teeth: greyish white

Permanent: Yellowish white

Question 11

Compare the appearance of deciduous teeth and permanent teeth

Answer 11

Deciduous teeth are bulbous and have a more pronounced labial and buccal cingulum
Permanent teeth are less bulbous and have a less prominent buccal and labial cingulum

Question 12

Compare the enamel thickness of deciduous and permanent teeth

Answer 12

Deciduous teeth: 0.5-1mm

Permanent teeth: 2mm

Question 13

Compare the enamel colours of deciduous and permanent teeth

Answer 13

Deciduous teeth are more opaque

Permanent teeth are less opaque

Question 14

Compare the enamel consistency and permeability of deciduous and permanent teeth

Answer 14

Deciduous teeth are softer and more permeable (more prone to wear and decay)
Permanent teeth are harder and less permeable

Question 15

Compare the incisal edges of the deciduous and permanent incisors

Answer 15

Mamelons present on the permanent incisors

Question 16

Compare the cusps of permanent and deciduous teeth

Answer 16

Deciduous teeth have sharper cusps where as permanent teeth are more rounded

Question 17

Which tooth has a larger pulp chamber: permanent or deciduous teeth

Answer 17

Deciduous teeth have a larger pulp chamber

Question 18

Compare the root/crown ratio od permanent and deciduous insciors and canines

Answer 18

Deciduous insciors and canines have longer roots in proportion to crown
Permanent teeth have less length in proportion to crowns

Question 19

Compare the size of the root canals in deciduous an permanent teeth

Answer 19

Deciduous teeth have an extremely fine root canals and permanent teeth have a more patent and well developed root canal system

Question 20

At what age do UPPER primary central incisors erupt

Answer 20

8-12 months

Question 21

At what age do UPPER primary lateral incisors erupt

Answer 21

9-13 months

Question 22

At what age do UPPER primary canines erupt

Answer 22

16-22 months

Question 23

At what age do UPPER primary first molars erupt

Answer 23

13-19 months

Question 24

At what age do UPPER primary second molars erupt

Answer 24

25-33 months

Question 25

At what age do LOWER primary central incisors erupt

Answer 25

6-10 months

Question 26

At what age do LOWER primary lateral incisors erupt

Answer 26

10-16 months

Question 27

At what age do LOWER primary canines erupt

Answer 27

17-23 months

Question 28

At what age do LOWER primary first molars erupt

Answer 28

14-18 months

Question 29

At what age do LOWER primary second molars erupt

Answer 29

23-31 months

Question 30

At what age do UPPER permanent central incisors erupt

Answer 30

7-8 yrs

Question 31

At what age do UPPER permanent lateral incisors erupt

Answer 31

8-9 years

Question 32

At what age do UPPER permanent canines erupt

Answer 32

11-12 years

Question 33

At what age do UPPER permanent first premolars erupt

Answer 33

10-11 years

Question 34

At what age do UPPER permanent second premolars erupt

Answer 34

10-12 years

Question 35

At what age do UPPER permanent first molars erupt

Answer 35

6-7 years

Question 36

At what age do UPPER permanent second molars erupt

Answer 36

12-13 years

Question 37

At what age do UPPER permanent third molars erupt

Answer 37

17-21 years

Question 38

At what age do LOWER permanent central incisors erupt

Answer 38

6-7 years

Question 39

At what age do LOWER permanent lateral incisors erupt

Answer 39

7-8 years

Question 40

At what age do LOWER permanent canines erupt

Answer 40

9-10 years

Question 41

At what age do LOWER permanent first premolars erupt

Answer 41

10-12 years

Question 42

At what age do LOWER permanent second premolars erupt

Answer 42

11-12 years

Question 43

At what age do LOWER permanent first molars erupt

Answer 43

6-7 years

Question 44

At what age do LOWER permanent second molars erupt

Answer 44

11-13 years

Question 45

At what age do LOWER permanent third molars erupt

Answer 45

17-21 years