Primary Dentition

Question 1

When does calcification begin

Answer 1

4-6months in utero

Question 2

When does eruption begin

Answer 2

6-24 months

Question 3

When does dentition fully erupt

Answer 3

By 2.5-3 years

Question 4

When is root formation completed

Answer 4

1 year after eruption

Question 5

When does root resorption begin

Answer 5

1 year after eruption

Question 6

When are primary teeth replaced by permanent dentition

Answer 6

From 6-12 years old

Question 7

Which primary tooth is larger than its successor

Answer 7

Mesio-distal width of deciduous molar>that of succeeding premolars

Question 8

How does deciduous pulp chamber compare to permanent

Answer 8

Larger

Question 9

Where do enamel rods in gingival 1/3 of primary dentition slope

Answer 9

occlusally rather than towards gingiva

Question 10

What is the difference between #51 and #11

Answer 10

#51 Smaller and crown more bulbous
#51 no mammelon
#51 pulp tissue closer to surface

Question 11

Where does apical 1/2 of root of #51 incline?

Answer 11

Labially to allow #11 to develop

Question 12

How many pulp horns does #51 have

Answer 12

2 (mesial and distal)

Question 13

Difference between #51 and #52 angles

Answer 13

Mesio-incisal angle more acute in #52

Disto-incisal angle more rounded in #52

Question 14

How would you describe the shape of #53

Answer 14

Symmetrical crown with fang-like appearance, viewed labially/ palatally, crown appears diamond-shaped

Question 15

Is #53 wider or longer

Answer 15

Wider

Question 16

How many cusps does #54 have

Answer 16

2-4.
Buccal (more prominent) and palatal are the main cusps, but both can be divided into mesial (larger)
and distal

Question 17

What can be observed on mesio-buccal aspect of #54 and #84

Answer 17

Tubercle of Zuckerkandl- large bulge of enamel towards cervical margin

Question 18

How many roots does #54 have

Answer 18

3 divergent roots:
Palatal (round and largest)
Mesio-buccal (flattened mesiodistally)
Disto-buccal (Smallest, most curved)

Question 19

How many pulp horns are there in #54

Answer 19

Well developed pulp horns to 2 main cusps, with additional pulp horns to additional cusps

Question 20

How many cusps does #55 have

Answer 20

4:
Mesiobuccal
Distobuccal
Mesiopalatal
Distopalatal

Question 21

What is a special feature of #55

Answer 21

Cusp of Carabelli at mesiopalatal

Question 22

How many roots does #55 have

Answer 22

3 divergent roots: mesiobuccal, distobuccal and palatal

Question 23

How many root canals and pulp horns does #81 have

Answer 23

1; 2 (mesial and distal pulp horn)

Question 24

What shape does #82 have

Answer 24

Crown is assymetrical; fanshaped
Mesio-incisal angle is sharp and actue
Disto-incisal angle is rounded

Question 25

Is the crown of #83 convex, concave or flat labially

Answer 25

convex

Question 26

Is #83 symmetrical

Answer 26

Asymmetrical, with mesial slope shorter than distal slope

Question 27

Is it true that the pulp and root canal are well defined in deciduous teeth

Answer 27

False

Question 28

How many roots does #83 have

Answer 28

1, triangular in cross-section

Question 29

How many fossa does #83 have lingually

Answer 29

It has two fossa, mesial and distal with a ridge connecting the cusp tip to the cingulum

Question 30

How would you describe the shape of #84 on the occlusal surface

Answer 30

Elongated mesio-distally forming an irregular rectangle

Question 31

How many cusps does #84 have

Answer 31

4;2 buccal and 2 lingual cusps, Mesial cusps larger than distal cusps

Question 32

Does #84 have a transverse ridge

Answer 32

Yes, it has a transverse ridge from the mesio-buccal to mesio-lingual cusp resulting in a small mesial fossa and big distal fossa (due to larger size of mesial cusps)

Question 33

How many roots does #84 have

Answer 33

2 divergent roots, mesial and distal both flattened mesio distally, mesial root is often grooved

Question 34

How many root canals in mesial root of #84

Answer 34

2

Question 35

Rank size of pulp horns in each cusp of #84

Answer 35

Largest MB (due to tubercle of Zuckerkandl) ML (Mesial cusp larger) DB Smallest DL

Question 36

Which permanent tooth is #85 most similar to

Answer 36

#46; #85 is smaller and narrower with a more pronounced cervical ridge on the buccal surface

Question 37

How many cusps does #85 have

Answer 37

5 (3 buccal and 2 lingual), one pulp horn per cusp

Question 38

How many roots does #85 have

Answer 38

2 divergent roots, mesial and distal both flattened mesio distally

Question 39

How many root canals does #85 have

Answer 39

3; 2 mesial and 1 distal