Tooth Eruption

Question 1

What are the last permanent incisors to erupt?

Answer 1

Mx LI

Question 2

Earliest age by which the roots of Mx PM1 are completely formed

Answer 2

12-13 years (2-3 yrs after eruption, 10-11)

Question 3

In permanent dentition, the 1st teeth to begin calcification are the

Answer 3

Mn M1s

Question 4

Perm M3s begin to calcify at what age range

Answer 4

8-10 years

Question 5

How many teeth would a 6 yo have?

Answer 5

24 (20 deciduous, 4 M1)

Question 6

Around what age are 3rd molars fully erupted w/ a complete root structure?

Answer 6

26-27 years (2-3 yrs after eruption, 23-24)

Question 7

LAST primary tooth to erupt

Answer 7

Mx M2

Question 8

Eruption sequence

Answer 8

CI, LI, M1, K9, M2

Question 9

FIRST primary teeth erupt

Answer 9

Mn CI (R&L)

Question 10

1 y.o. eruptions:

Answer 10

primary Mx/Mn CI/LI & M1s

Question 11

New primary tooth @ 12 months

Answer 11

Mn M1 (12 month molar)

Question 12

Primary M2 erupts:

Answer 12

2 y.o.

Question 13

7 months

Answer 13

Primary Mn/Mx CI

Question 14

11 months

Answer 14

Primary Mn/Mx CI + LI

Question 15

15 months

Answer 15

Primary Mn/Mx CI + LI + 4 M1

Question 16

19 months

Answer 16

Primary Mn/Mx CI + LI + 4 M1 + 4 K9s

Question 17

23 months

Answer 17

Primary Mn/Mx CI + LI + 4 M1 + 4 K9s + 4 M2

Question 18

PM2

Answer 18

Mesial cusp slope is shorter than distal cusp slope

Question 19

Eruption

Answer 19

Movement of the tooth through the gums so that the clinical crown slowly gets longer. (NOT EXFOLIATION)

Question 20

Permanent teeth begin to form at 4 months in utero

Answer 20

Perm Mn M1

Question 21

1st succedaneous to erupt

Answer 21

Mn CI at 6-7 years (*Mn M1 is not succedaneous)

Question 22

Mx/Mn M1 calcify at:

Answer 22

Birth, begin to form at 4 months in utero

Question 23

Initiation of calcification for Mn CI

Answer 23

3-4 months

Question 24

Perm M3s begin to calcify at

Answer 24

8-10 years

Question 25

Root formation

Answer 25

Eruption= 50 % root

2-3 years = 100% root

Question 26

Active eruption of teeth occurs after

Answer 26

1/2 of root is formed

Question 27

Tooth makes its appearance in mouth when

Answer 27

1/2 root is complete

Question 28

By the time of eruption, percent of root calcification is complete

Answer 28

50%

Question 29

Apex is usually fully developed

Answer 29

2-3 years after eruption

Question 30

6 years age

Answer 30

Presents with 20 primary, 4 perm M1; first sign of mixed dentition

Question 31

First sign of mixed dentition

Answer 31

6 years, Mn M1s

Question 32

6 Y.O. would have the following teeth clinically visible:

Answer 32

All primary teeth + perm M1s

Question 33

7 years age

Answer 33

Presents w/ 18 primary, 6 perm teeth (4 Ms, 2 Mn CI) – loss of primary Mn CI

Question 34

8 years age

Answer 34

Present with permanent M1 s, CI/LIs, primary K9s and M2 – no PMs

Question 35

At 8 years, perm Mx M1 has no:

Answer 35

distal contact (but, has mesial contact with primary Mx M2)

Question 36

9 years age

Answer 36

12 primary teeth (primary K9s, 2Ms per quadrant)

Question 37

10 years age

Answer 37

Perm Mx/Mn CI/LI, PM1, M1 and Mn K9s

Question 38

One would expect the root of what tooth to be finished forming and calcifying at 10 y.o.?

Answer 38

Perm M1s (eruption, 6-7 years)