Deck 16: Deciduous Dentition

Question 1

Which deciduous molar has three or four cusps,an oblique ridge,three roots,and often has no distal pit (Select all that apply. )?

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

Answer 1

A
The maxillary first molar may have three or four cusps and has three roots.If four are present,two are buccal and two are lingual.If three are present,only one is lingual.On the three-cusp form,only a central and a mesial pit (no distal pit)are evident,and an oblique ridge often unites mesiolingual and distofacial cusps.

Question 2

Decay progresses quickly in deciduous teeth due to each of the following EXCEPT one.Which one is the EXCEPTION?

A) Presence of high pulp horns
B) Thinner enamel covering crowns
C) Harder enamel
D) Thinner dentin

Answer 2

C
Enamel in deciduous teeth is not harder than that in permanent teeth.To clarify,if enamel were harder,this would make teeth more resistant to decay.

Question 3

Although it is much smaller,the deciduous maxillary second molar resembles its permanent molar successor because the deciduous maxillary second molar has two equal-sized cusps divided by a buccal groove.

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.

Answer 3

D
The successor of the deciduous maxillary second molar is the permanent maxillary premolar! Note that the permanent molars are nonsuccedaneous or accessional.However,the deciduous maxillary second molar does resemble the permanent maxillary first molar primarily because of the equal-sized buccal cusps divided by a buccal groove.Note that the referenced deciduous molar is smaller than the referenced permanent molar.

Question 4

The occlusal table is narrower buccolingually because the buccal and lingual surfaces of deciduous molars taper occlusally.

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 5

Primary teeth are whiter than their permanent successors.They are smaller in crown dimension but have roots approximately the same size as the permanent dentition.

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 6

Which deciduous molars have three root canals (Select all that apply. )?

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

Question 7

The longer and more slender deciduous roots also flare more than those of the permanent dentition because this arrangement allows room for the developing permanent tooth crowns.

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 8

The root of the mandibular canine is slightly shorter and more tapered than its maxillary counterpart.Both roots taper facially and apically.

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 9

The buccocervical ridges on the deciduous molars are quite pronounced.The second molar shows the most prominence.

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 10

Which is the largest root on deciduous maxillary molars?

A) Mesiobuccal
B) Mesiolingual
C) Distobuccal
D) Lingual

Question 11

The root of the mandibular lateral incisor has a mesial and distal longitudinal grove running in a circular fashion.The mandibular central incisor root does not have any grooves or depressions.

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 12

Which of the following statements accurately describe the deciduous maxillary lateral incisor (Select all that apply. )?

A) The crown is smaller than a central incisor's crown.
B) The root of the lateral incisor appears much longer than its crown.
C) A common anomaly is that the maxillary lateral incisor appears peg-shaped.
D) The lateral incisor shows considerable variation in form.
E) This tooth appears similar to a deciduous central incisor.

Question 13

Teeth that erupt between 16 and 22 months of age are the deciduous

A) lateral incisors
B) canines
C) first molars
D) second molars

Question 14

An extra margin of space is available for the eruption of the permanent canine as well as the first and second premolars because the formation of diastemas provides this extra space.

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

The deciduous lateral incisors erupt prior to the central incisors.Lateral incisors erupt between 13 and 19 months whereas central incisors erupt between 16 and 22 months.

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 16

Each of the following is true of deciduous teeth as compared with permanent teeth EXCEPT one.Which one is the EXCEPTION?

A) Deciduous teeth are generally lighter in color.
B) Dentin is thinner.
C) Pulp horns extend higher occlusally.
D) There is a pronounced cervical ridge.
E) Enamel is thicker and more protective.

Question 17

At 3 to 4 years of age,the coronal aspect of the root begins to resorb and continues apically until the tooth is shed.The process of shedding the deciduous dentition and replacement by permanent successors is called exfoliation.

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

Which of the following statements accurately describe the deciduous maxillary first molar (Select all that apply. )?

A) This tooth closely resembles the permanent maxillary second premolar.
B) This tooth is the most atypical of all maxillary molars.
C) This tooth is the most typical of all maxillary molars,closely resembling deciduous maxillary second molars.
D) Like all other maxillary molars,this tooth is wider buccolingually than mesiodistally.
E) The crown may have three or four cusps.

Question 19

Which of these deciduous molars are wider mesiodistally than faciolingually?

A) First molars
B) Second molars
C) Maxillary molars
D) Mandibular molars

Question 20

Which deciduous root has two canals?

A) Maxillary lateral incisor
B) Maxillary second molar,mesiobuccal root
C) Mandibular canine
D) Mandibular second molar,mesial root

Question 21

Root trunks of deciduous molars are long.

Question 22

MATCHING
During the mixed dentition,it is often challenging to distinguish deciduous and permanent teeth.While there are many similarities,significant differences exist.Match the descriptive term with its corresponding tooth.
a.Facial
b.No mamelons are visible.
c.Roots are almost twice the length of crowns.
d.Resembles the permanent mandibular first molar
e.Primary tooth that bears least resemblance to another tooth
Buccal

Question 23

The largest cusp on the deciduous maxillary second molar is the mesiolingual cusp.

Question 24

The crown of a deciduous maxillary first molar is much larger than that of the maxillary second molar;however the roots of the second molar are longer.

Question 25

MATCHING
During the mixed dentition,it is often challenging to distinguish deciduous and permanent teeth.While there are many similarities,significant differences exist.Match the descriptive term with its corresponding tooth.
a.Facial
b.No mamelons are visible.
c.Roots are almost twice the length of crowns.
d.Resembles the permanent mandibular first molar
e.Primary tooth that bears least resemblance to another tooth
Maxillary first molar

Question 26

MATCHING
During the mixed dentition,it is often challenging to distinguish deciduous and permanent teeth.While there are many similarities,significant differences exist.Match the descriptive term with its corresponding tooth.
a.Facial
b.No mamelons are visible.
c.Roots are almost twice the length of crowns.
d.Resembles the permanent mandibular first molar
e.Primary tooth that bears least resemblance to another tooth
Canines

Question 27

Deciduous maxillary molars have a well-developed cusp of Carabelli.

Question 28

Deciduous canines erupt before first molars.

Question 29

MATCHING
During the mixed dentition,it is often challenging to distinguish deciduous and permanent teeth.While there are many similarities,significant differences exist.Match the descriptive term with its corresponding tooth.
a.Facial
b.No mamelons are visible.
c.Roots are almost twice the length of crowns.
d.Resembles the permanent mandibular first molar
e.Primary tooth that bears least resemblance to another tooth
Maxillary central incisors

Question 30

MATCHING
During the mixed dentition,it is often challenging to distinguish deciduous and permanent teeth.While there are many similarities,significant differences exist.Match the descriptive term with its corresponding tooth.
a.Facial
b.No mamelons are visible.
c.Roots are almost twice the length of crowns.
d.Resembles the permanent mandibular first molar
e.Primary tooth that bears least resemblance to another tooth
Primary mandibular second molar