Eruption of teeth

Question 1

Explain the Universal symbolic system used to classify primary dentition

Answer 1

From right to left:
ABCDE / FGHIJ
TSRQP / ONMLK

Question 2

Zisgmondy/Palmer symbolic system

Answer 2

From right to left:
EDCBA / ABCDE
EDCBA / ABCDE

Question 3

Once fully calcified, it takes ____ until permanent tooth eruption takes place

Answer 3

2-5 years

Question 4

Which is the first permanent tooth to calcify?

Answer 4

mandibular first molar

Question 5

Once the permanent tooth erupts, it continues to form until what?

Answer 5

Until the closure of apex or apices, which takes place 1.5-3.5 years after eruption

Question 6

Year of eruption of permanent Mx central

Answer 6

7-8

Question 7

Year of eruption of permanent Md central

Answer 7

6-7

Question 8

Year of eruption of permanent Mx lateral

Answer 8

8-9

Question 9

Year of eruption of permanent Md lateral

Answer 9

7-8

Question 10

Year of eruption of permanent Mx canine

Answer 10

11-12

Question 11

Year of eruption of permanent Md canine

Answer 11

9-10

Question 12

Year of eruption of permanent Mx 1st PM

Answer 12

10-11

Question 13

Year of eruption of permanent Md 1st PM

Answer 13

10-12

Question 14

Year of eruption of permanent Mx 2nd PM

Answer 14

10-12

Question 15

Year of eruption of permanent Md 2nd PM

Answer 15

11-12

Question 16

Year of eruption of permanent Mx 1st molar

Answer 16

6-7

Question 17

Year of eruption of permanent Md 1st molar

Answer 17

6-7

Question 18

Year of eruption of permanent Mx 2nd molar

Answer 18

12-13

Question 19

Year of eruption of permanent Md 2nd molar

Answer 19

11-13

Question 20

Year of eruption of permanent Mx 3rd molar

Answer 20

17-21

Question 21

Year of eruption of permanent of Md 3rd molar

Answer 21

17-21

Question 22

calcification of primary dentition begins ____

Answer 22

in utero (14 weeks with maxillary and mandibular central incisors)

Question 23

Formation of primary dentition is completed when?

Answer 23

2-3 years after the initiation of calcification with the formation of the roots of 2nd Mx molars

Question 24

When do the first primary teeth typically erupt?

Answer 24

during the 6th month of life (Md incisors)

Question 25

Time of eruption of primary Mx 51/61

Answer 25

10 m

Question 26

Time of eruption of primary 52/62

Answer 26

11 m

Question 27

Time of eruption of primary Mx 53/63

Answer 27

19 m

Question 28

Time of eruption of primary Mx 54/64

Answer 28

16 m

Question 29

Time of eruption of primary Mx 55/65

Answer 29

29 m

Question 30

Time of eruption of primary Md 71/81

Answer 30

8 m

Question 31

Time of eruption of primary Md 72/82

Answer 31

13 m

Question 32

Time of eruption of primary 73/83

Answer 32

20 m

Question 33

Time of eruption of primary Md 74/84

Answer 33

16 m

Question 34

Time of eruption of primary Md 75/85

Answer 34

27 m

Question 35

3 significant major stages of tooth formation:

Answer 35

- beginning calcification - crown completion - root completion

Question 36

14 stages of tooth formation

Answer 36

``` Ci = cusp initiated Cco = cusp coalesced Coc = cusp outline complete Cr1/2 = crown 1/2 Cr3/4 = corwn 3/4 Crc = crown complete Ri = root initiated Cli = cleft initiated R1/4 = root 1/4 R1/2 = Root 1/2 R3/4 = Root 3/4 Rc = root complete A1/2 = apex 1/2 Ac = Apex complete ```

Question 37

what are natal teeth?

Answer 37

teeth that can be present at birth. These are either primary teeth or supernumerary

Question 38

What are the names of teeth that erupt within the first month of birth?

Answer 38

neonatal teeth

Question 39

Sequence for eruption of Mx teeth (same for Md)

Answer 39

ABDCE

Question 40

Sequence of eruption or primary Mx and Md teeth

Answer 40

Md A, Mx A, Mx B, Md B, Mx D, Md D, Mx C, Md C, Md E, Mx E AB D C E A B D CE

Question 41

By 6-8 months, which teeth should be present?

Answer 41

Md central incisors

Question 42

By 12 months, which teeth should be present?

Answer 42

All incisors

Question 43

By 18 months, which teeth should be present?

Answer 43

All incisors, 1st molars, and canines

Question 44

By 30 months, which teeth should be present?

Answer 44

all primary teeth

Question 45

What effect can the premature loss of primary teeth have on the permanent dentition?

Answer 45

may lead to a loss of space needed for the permanent dentition, leading to crowding

Question 46

If 85 is retained, what could happen to the Mx tooth occluding it?

Answer 46

it could overerupt

Question 47

sequence of eruption of Mx and Md permanent dentition

Answer 47

Mx: 6 1 2 4 5 3 7 8 Md: 6 1 2 3 4 5 7 8

Question 48

first permanent teeth to erupt?

Answer 48

Md 1st molars

Question 49

Which generally erupt prior to their counterparts in permanent dentition? Mx or Mad

Answer 49

Md

Question 50

When do Md 1st molars erupt and where?

Answer 50

at about 6 years. Distal to primary second molars

Question 51

All permanent incisors erupt between ___ to ____ years

Answer 51

7.5 to 8.5 years

Question 52

When to Md permanent canines erupt?

Answer 52

about 10 years

Question 53

By what age do all premolars and Mx canines erupt?

Answer 53

by 10.5-11.5 years