Tooth Morphology Of The Permanent Dentition

Question 1

How many teeth is the permanent dentition made up of?

Answer 1

32 teeth

(16 in upper jaw, 16 in lower jaw)

Question 2

How many quadrants is the oral cavity divided into?

Answer 2

4

Question 3

When you chart a patient what is R and L?

Answer 3

RHS is patients left vice versa

Question 4

When does the upper central incisor erupt?

Answer 4

7-8yrs

Question 5

When does the upper lateral incisor erupt?

Answer 5

8-9yrs

Question 6

When does the upper canine erupt?

Answer 6

11-12yrs

Question 7

When does the upper first pre molar erupt?

Answer 7

10-11yrs

Question 8

When does the upper second pre molar erupt?

Answer 8

10-12yrs

Question 9

When does the upper First molar erupt?

Answer 9

6-7yrs

Question 10

When does the upper Second molar erupt?

Answer 10

12-13yrs

Question 11

When does the upper Third molar erupt?

Answer 11

17-21yrs

Question 12

When does the lower central incisor erupt?

Answer 12

6-7yrs

Question 13

When does the lower lateral incisor erupt?

Answer 13

7-8yrs

Question 14

When does the lower canine erupt?

Answer 14

9-10yrs

Question 15

When does the lower first pre molar erupt?

Answer 15

10-12yrs

Question 16

When does the lower second pre molar erupt?

Answer 16

11-12yrs

Question 17

When does the lower first molar erupt?

Answer 17

6-7yrs

Question 18

When does the lower second molar erupt?

Answer 18

11-13yrs

Question 19

When does the lower third molar erupt?

Answer 19

17-21yrs

Question 20

How do we determine the root completion age?

Answer 20

2-3yrs after eruption date

Eg eruption - 7-8yrs … root completion - 10yrs

Question 21

Teeth notation systems

Answer 21

• Universal system (USA)
• Palmer nomination system (UK)
• World dental federation (World)

Question 22

How does the universal system work?

Answer 22

Upper right 1 (wisdom tooth) until 8 (central) then 8 - 16

Lower left 17 (wisdom) until 24 (central) then 25 - 32

Question 23

The universal system

Answer 23

Question 24

FDI system - permanent dentition

Answer 24

Each quadrant is given a number
URQ = 1
ULQ = 2
LLQ = 3
LRQ = 4
Double digit system - (each tooth is designated quadrant number and tooth number)

Question 25

FDI system - primary dentition

Answer 25

Each quadrant is given a number
URQ = 5
ULQ = 6
LLQ = 7
LRQ = 8
Double digit system - (each tooth is designated quadrant number and tooth number 1-5)

Question 26

Palmer notation system

Answer 26

Symbol + tooth number 1-8 for permanent teeth