Deck 14: Premolars

Question 1

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) 6

Answer 1

B
In the three-cusp type of mandibular second premolar,the groove pattern is commonly called a Y-groove pattern.The Y-groove pattern is by far the most dominant form,occurring much more frequently than the less prevalent two-cusp forms.Of the less prevalent two-cusp forms,the H-groove is more common that the U-groove.

Question 2

The mandibular second premolar shows evidence of calcification at 2.5 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 statement is false.
C) The first statement is false;the second statement is true.
D) Both statements are false.

Answer 2

B
While the mandibular second premolar shows evidence of calcification at 2.5 years of age,completion of enamel formation occurs at 6 to 7 years of age.Eruption,however,occurs between 11 and 12 years.

Question 3

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

Answer 3

B
The maxillary first premolars are the only premolars that normally have two roots,a buccal and a lingual.It must be noted that occasionally only a single root is present on this tooth.Even when only one root is present,two pulp canals can usually be found.

Question 4

A prominent characteristic of the maxillary first premolar is

A) a mesiolingual developmental groove
B) a central fossa
C) a mesial marginal developmental groove
D) a distal marginal developmental groove

Question 5

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

Question 6

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

Question 7

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 8

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 9

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 10

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 11

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 12

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

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

Question 13

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

Question 14

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 15

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 16

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

Question 18

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

Question 19

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

Question 20

Which premolar has the smallest lingual cusp?

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

Question 21

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 22

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

Question 23

The maxillary first premolar has a canine fossa.

Question 24

All premolars have lingual cusps that are afunctional.

Question 25

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.

Question 26

Bicuspid means the same thing as premolars.

Question 27

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

Question 28

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 29

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