Deck 14: Premolars

Question 1

Figure "A" below is which tooth?

A) Maxillary right second premolar
B) Maxillary left second premolar
C) Maxillary right first premolar
D) Maxillary left first premolar

Answer 1

C
Figure "A" represents a maxillary right first premolar because it has two roots and an extremely well formed lingual cusp. Figure "A" depicts this tooth from a buccal view; note that from the contact area cervically, the distal surface is straight, whereas the corresponding mesial surface is more concave.

Question 2

Mandibular first premolars typically have two roots, a mesial and a distal. An anomaly is formation of a third auxiliary root.

A) Both statements are true.
B) The first statement is true; the second is false.
C) The first statement is false; the second is true.
D) Both statements are false.

Answer 2

D
Mandibular first premolars typically have one root. An anomaly is formation of two roots, one buccal and one lingual. In mandibular first premolars with two roots, a deep longitudinal groove separates the roots on the proximal sides.

Question 3

Which premolar has the smallest lingual cusp?

A) Maxillary first
B) Maxillary second
C) Mandibular first
D) Mandibular second

Answer 3

C
The lingual cusp of the mandibular first premolar is so small in height and width that it does not occlude with any of the maxillary teeth. For this reason the lingual cusp of the mandibular first premolar is considered afunctional.

Question 4

Figure "B" below illustrates a view of which surface?

A) Buccal
B) Lingual
C) Mesial
D) Distal

Question 5

Each of the following is evident on a maxillary first premolar EXCEPT one. Which one is the EXCEPTION?

A) Mesial marginal groove
B) Mesial developmental depression
C) Mesial marginal ridge
D) Distinct distal marginal ridge
E) Two small, afunctional lingual cusp tips

Question 6

In figure "B" below, identify the tooth, the number of cusps, and groove pattern.

A) Mandibular second premolar; two cusps; "H" groove pattern
B) Mandibular second premolar; two cusps; "Y" groove pattern
C) Mandibular first premolar; two cusps; "U" groove pattern
D) Mandibular second premolar; three cusps; "U" groove pattern

Question 7

The lingual surface of premolars is formed from how many lobes?

A) One
B) Two
C) Three
D) Not all premolars are formed from the same number of lobes.

Question 8

A prominent characteristic of the maxillary first premolar is a

A) Mesiolingual developmental groove
B) Central fossa
C) Mesial marginal developmental groove
D) Distal marginal developmental groove

Question 9

In figure "A" below, identify the tooth, the number of cusps, and groove pattern.

A) Mandibular first premolar; two cusps; "C" groove pattern
B) Mandibular second premolar; two cusps; "Y" groove pattern
C) Mandibular first premolar; two cusps; "H" groove pattern
D) Mandibular second premolar; two cusps; "U" groove pattern

Question 10

Which type of cusp pattern does the letter "Y" represent on the mandibular second premolar (how many total cusps)?

A) 2
B) 3
C) 4
D) None of the above

Question 11

Premolars erupt between 9 and 12 years of age. Premolars are the succedaneous teeth that replace primary canines.

A) Both statements are true.
B) The first statement is true; the second is false.
C) The first statement is false; the second is true.
D) Both statements are false.

Question 12

As a rule, the mandibular first premolars are always smaller than the mandibular second premolars. The most striking identifying feature of the mandibular first premolar is the mesiolingual developmental groove.

A) Both statements are true.
B) The first statement is true; the second is false.
C) The first statement is false; the second is true.
D) Both statements are false.

Question 13

Which selection best describes the roots of the maxillary first premolar?

A) Two roots, one mesial and one distal
B) Two roots, one buccal and one lingual
C) Fused roots
D) One root only

Question 14

The overall height of the premolars is longer than that of the canines because the root of the premolars is considerably longer than those of the canines.

A) Both the statement and the reason are correct and related.
B) Both the statement and the reason are correct but are NOT related.
C) The statement is correct, but the reason is NOT correct.
D) The statement is NOT correct, but the reason is correct.
E) NEITHER the statement NOR the reason is correct.

Question 15

Which premolar has buccal and lingual cusps that are almost the same height?

A) Maxillary first
B) Maxillary second
C) Mandibular first
D) Mandibular second
E) None of the above

Question 16

The mandibular second premolar always has three cusps because this tooth always forms from five lobes.

A) Both the statement and the reason are correct and related.
B) Both the statement and the reason are correct but are NOT related.
C) The statement is correct, but the reason is NOT correct.
D) The statement is NOT correct, but the reason is correct.
E) NEITHER the statement NOR the reason is correct.

Question 17

Any ridge that extends from the cusp tip to the central groove of the occlusal surface is called a marginal ridge. When two marginal ridges join, after traversing the tooth buccolingually, they form a transverse ridge.

A) Both statements are true.
B) The first statement is true; the second is false.
C) The first statement is false; the second is true.
D) Both statements are false.

Question 18

All of the premolars usually have a transverse ridge that crosses an occlusal developmental groove EXCEPT one. Which one is the EXCEPTION?

A) Maxillary first
B) Maxillary second
C) Mandibular first
D) Mandibular second

Question 19

The mandibular second premolar shows evidence of calcification at $2 {~~1 / 2}$ years. Completion of enamel formation does not occur; until 11 to 12 years.

A) Both statements are true.
B) The first statement is true; the second is false.
C) The first statement is false; the second is true.
D) Both statements are false.

Question 20

Any ridge that runs from the cusp tip to the central groove of the occlusal surface is called a triangular ridge. Triangular ridges are located near the mesial marginal ridge of premolars but not near the distal marginal ridge.

A) Both statements are true.
B) The first statement is true; the second is false.
C) The first statement is false; the second is true.
D) Both statements are false.

Question 21

Bicuspid means the same thing as premolars.

Question 22

The buccal cusp of a maxillary first premolar is longer than the buccal cusp of the second premolar.

Question 23

All premolars have lingual cusps that are afunctional.

Question 24

Which of the following are true of both maxillary first premolars and maxillary second premolars (select all that apply)?

A) Both have two cusps.
B) Both have two roots.
C) Both are formed from four developmental lobes.
D) Both have two pulp horns.

Question 25

The maxillary first premolar has a canine fossa.

Question 26

Which of the following are located on the occlusal surfaces of premolars (select all that apply)?

A) Marginal ridges
B) Transverse ridges
C) Triangular ridges
D) Premolar eminence

Question 27

In figure "C" below, identify the tooth, the number of cusps, and groove pattern.

A) Mandibular second premolar; three cusps; "Y" groove pattern
B) Mandibular first premolar; three cusps; "H" groove pattern
C) Mandibular first premolar; three cusps; "U" groove pattern
D) Mandibular second premolar; two cusps; "C" groove pattern

Question 28

Maxillary second premolars have a smoother, less detailed occlusal surface than first premolars.

Question 29

Which of the following are true of the maxillary second premolars (select all that apply)?

A) Evidence of calcification is seen at 2 years of age.
B) Completion of enamel formation occurs at 4 years of age.
C) Eruption occurs at 11 to 13 years of age.
D) Root formation is completed by 12 to 14 years of age.