Primary Teeth

Question 1

Which primary teeth have crowns that are wider mesiodistally than they are long inciso- or occluso-cervically?

a. Maxillary central incisor
b. Maxillary first molar
c. Mandibular lateral incisor
d. Mandibular first molar
e. Mandibular canine

Answer 1

a. maxillary central incisor
b. maxillary first molar
d. mandibular first molar

Question 2

Which one tooth is adjacent and distal to the primary second molar on a seven year old?

a. Maxillary first premolar
b. Maxillary second premolar
c. Secondary maxillary first molar
d. Secondary maxillary second molar
e. Primary maxillary first molar

Answer 2

c. secondary maxillary first molar

Question 3

How many teeth should be visible in the mouth of a 3-year old?

Answer 3

20 teeth

Question 4

How many teeth should be present in the mouth of a 13-year old?

Answer 4

28 teeth

Question 5

Which primary molar most resembles a secondary maxillary right first molar?

Answer 5

Tooth A

Question 6

What would you estimate to be the dental age of a child with the following teeth: all primary maxillary incisors, canines, and molars; secondary mandibular incisors and first molars.

a. 2-4 years.
b. 5-7 years.
c. 8-9 years.
d. 10-11 years.
e. Over 12 years.

Answer 6

b. 5-7 years

Question 7

Which teeth (primary or secondary) have the mesial proximal contact positioned more cervically than the distal proximal contact?

a. Mandibular first premolar
b. Maxillary first premolar
c. Primary maxillary canine
d. Primary mandibular canine
e. Mandibular second premolar

Answer 7

a. mandibular first premolar

c. primary maxillary canine

Question 8

1. Which teeth (primary or secondary) have the mesial cusp ridge of the facial cusp longer than the distal cusp ridge of the facial cusp?
   a. Mandibular first premolar
   b. Maxillary first premolar
   c. Primary maxillary canine
   d. Primary mandibular canine
   e. Mandibular second premolar

Answer 8

b. maxillary first premolar

c. primary maxillary canine

Question 9

Which succedaneous tooth erupts beneath tooth J?

Answer 9

No. 13

Question 10

Which of the following traits can be used to differentiate primary teeth from secondary teeth?

a. 1˚ teeth have greater facial cervical bulges.
b. 1˚ teeth have relatively thinner and longer roots.
c. 1˚ teeth are whiter.
d. 1˚ ant. teeth are larger than their successors.
e. 1˚ teeth have relatively larger pulps.

Answer 10

a. 1˚ teeth have greater facial cervical bulges.
b. 1˚ teeth have rel. thinner and longer roots.
c. 1˚ teeth are whiter.
e. 1˚ teeth have relatively larger pulps.

Question 11

Which of the following secondary teeth would you expect to be erupted in the average 9-10 year old?

a. Maxillary lateral incisor
b. Maxillary central incisor
c. Mandibular canine
d. Maxillary canine
e. Mandibular second molar

Answer 11

a. maxillary lateral incisor
b. maxillary central incisor
c. mandibular canine

Question 12

Which traits apply to a primary mandibular first molar.

a. Its roots are resorbed by the eruption of the 6-year mandibular first molar.
b. It resembles a mandibular 6-year first molar.
c. It has a prominent buccal cervical ridge.
d. It has a prominent mesial marginal ridge.
e. It has a prominent transverse ridge.
f. It has an occlusal table larger in the mesial half than the distal half.

Answer 12

c. It has a prominent buccal cervical ridge.
d. It has a prominent mesial marginal ridge.
e. It has a prominent transverse ridge.

Question 13

What class of teeth is present in the permanent dentition that is NOT present in the primary dentition?

a. incisors
b. canines
c. premolars
d. molars

Answer 13

c. premolars

Question 14

Which permanent tooth erupts into the space previously held by the primary second molar?

a. first molar
b. second molar
c. first premolar
d. second premolar

Answer 14

d.

Question 15

Which primary tooth looks most like #19?

Answer 15

K

Question 16

Over what length of time are primary teeth in the process of erupting?

Answer 16

6 months to 2 years

Question 17

Which tooth replaces tooth A?

Answer 17

4

Question 18

When distinguishing a primary maxillary second molar from a permanent maxillary first molar, only the permanent maxillary first molar…

a. has a distolingaul cusp
b. has root spositioned mesially and distally
c. has a relatively longer root trunk
d. has a more prominent MB cervical ridge
e. is likely to have a cusp of Carabelli

Answer 18

c

Question 19

What would you estimate to be the dental age of a child with the following teeth, all secondary incisors and secondary first molars, and all primary canines and molars?

a. 2-5 years
b. 5-7 years
c. 8-9 years
d. 10-11 years
e. over 12 years

Answer 19

C

Question 20

Which primary tooth most resembles a permanent (secondary) maxillary right first premolar (from the occlusal view)?

Answer 20

B

Question 21

At what year does the tooth hard tissue formation being from the permanent first molars

a. six month in utero
b. birth
c. two years
d. four years
e. six years

Answer 21

B

Question 22

Which two teeth exhibit a mesial cusp ridge of the facial cusp longer than the distal cusp ridge?

a. permanent maxillary first premolar and permanent (secondary) mandibular first premolar
b. permanent (secondary) mandibular first premolar and primary canine
c. permanent (secondary) mandibular first premolar and primary mandibular first molar
d. primary maxillary first molar and primary mandibular first molar
e. primary maxillary canine and permanent (secondary) maxillary first premolar.

Answer 22

E

Question 23

What is the universal number of the adult (secondary) tooth that erupts into the space that was previously occupied by primary tooth B?

Answer 23

5