Deck 15: Molars

Question 1

All of the following terms are characteristic of maxillary third molars EXCEPT one.Which one is the EXCEPTION?

A) Congenitally missing
B) Impacted
C) Erupt between 18 and 25 years
D) Show variations of the crown or roots

Answer 1

C
Maxillary third molars erupt between 17 and 21 years of age.However,their root formation is completed between 18 and 25 years.Third molars,both maxillary and mandibular,are irregular,unpredictable,and show significant crown/root variation.These unpredictable teeth have a tendency to become impacted due to bone obstruction as well as poor angulation within bone.Although our ancestors had great use for third molars,a modern genetic trend is that they are commonly congenitally missing.

Question 2

Which molar's occlusal groove pattern resembles a cross (+)?

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

Answer 2

D
The main grooves of the mandibular first molar form a cross (+).The single buccal grove joins with the single lingual groove join on the occlusal surface.They bisect the central developmental groove,forming a cross pattern.

Question 3

Maxillary and mandibular first molars have a fifth or supplemental cusp.This additional cusp,the cusp of Carabelli,is located on the mesiolingual cusp tip.

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 3

B
Although the cusp of Carabelli is located on the mesiolingual cusp tip,this supplemental (fifth)cusp is not found on mandibular molars.While it is most common on maxillary first molars,it occasionally is present on maxillary second molars and rarely exists on maxillary third.

Question 4

The calcification of both maxillary and mandibular first molars is evident at birth.The calcification of maxillary third molars is evident at 5 years whereas calcification of mandibular third molars is evident at 7 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.

Question 5

The mesial root of the mandibular first molar often has

A) one pulp canal
B) two pulp canals
C) two distinct mesial roots
D) dilaceration

Question 6

The root completion for the maxillary first molar is how many years of age?

A) 6
B) 8
C) 9 to 10
D) 11 to 12

Question 7

Compared with first molars,third molars most often have

A) more roots
B) longer roots
C) closer roots
D) less defined roots

Question 8

The distal contact area of the mandibular right first molar is located on the distal cusp.This contact area centered over the distal 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 9

Below is an illustration of the buccal surface of a mandibular right second molar.Structure "c" depicts the

A) mesiobuccal cusp
B) buccal groove
C) distobuccal groove
D) buccal pit

Question 10

Maxillary molars have an oblique ridge.The oblique ridge is a marginal ridge.

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

Each of the following structures is present on maxillary first molars EXCEPT one.Which one is the EXCEPTION?

A) Central pit
B) Buccal groove
C) Lingual marginal ridge
D) Distal pit

Question 12

Below is an illustration of the buccal surface of a mandibular right second molar.Structure "a" depicts the

A) mesiobuccal cusp
B) buccal pit
C) distobuccal cusp
D) buccal groove

Question 13

Below is an illustration of the buccal surface of a mandibular right second molar.Structure "b" depicts the

A) buccal groove
B) distobuccal cusp
C) buccal pit
D) mesiobuccal cusp

Question 14

Which of the following is true of mandibular first and second molars?

A) The two buccal cusps of both teeth are divided by a buccal groove.
B) Only the mandibular first molar has a buccal groove dividing the two buccal cusps.
C) Only the mandibular second molar has a buccal groove dividing the two buccal cusps.
D) Both mandibular first and second molars have a fifth cusp.

Question 15

Permanent maxillary first molars are classified as succedaneous teeth.They are generally the largest of the three molars.

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

Maxillary molars have at least four pulp horns.Mandibular molars have three pulp horns except for the third molars,which have four.

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 17

The distolingual cusp of a maxillary first molar is quite small and considered afunctional.This cusp occupies 10% of the lingual surface and the mesiolingual cusp occupies the remaining 90% of the lingual surface.

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

The oblique ridge,unique to the maxillary molars,is considered a transverse ridge because it runs in several directions.

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 19

Maxillary molars have sturdy anchorage because the two roots are connected to a single root trunk.

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 20

Each of the following statements correctly describes maxillary molars EXCEPT one.Which one is the EXCEPTION?

A) Roots become shorter as the maxillary molar is more posterior.
B) Second molar roots are closer together than first molars.
C) Third molar roots are usually smaller than first or second molars.
D) First molar roots show the most variation in root form of all three molars.

Question 21

In the figure below,"d" represents the ____________.

Question 22

In the figure below,"b" represents the ____________.

Question 23

In the figure below,"a" represents the ____________.

Question 24

In the figure below,"e" represents the ____________.

Question 25

MATCHING
Root and crown anatomy of molars varies significantly.The basis of a dental practitioner's ability to evaluate and recommend appropriate treatment is based on a sound understanding of anatomical features.Match the descriptions with the appropriate teeth.
a.Small distal cusp
b.Cusp of Carabelli
c.Four equal cusps
d.Often has two fused roots
e.Calcifies at three years of age
Maxillary first molar

Question 26

Mandibular molars are wider mesiodistally than buccolingually.

Question 27

MATCHING
Root and crown anatomy of molars varies significantly.The basis of a dental practitioner's ability to evaluate and recommend appropriate treatment is based on a sound understanding of anatomical features.Match the descriptions with the appropriate teeth.
a.Small distal cusp
b.Cusp of Carabelli
c.Four equal cusps
d.Often has two fused roots
e.Calcifies at three years of age
Mandibular second molar

Question 28

In the figure below,"c" represents the ____________.

Question 29

Below is an illustration of the buccal surface of a mandibular right second molar.Structure "d" depicts the

A) distobuccal cusp
B) mesiobuccal cusp
C) buccal groove
D) buccal pit

Question 30

Accessional is another term for nonsuccedaneous.

Question 31

The mesiobuccal root is the longest root on maxillary first and second molars.

Question 32

MATCHING
Root and crown anatomy of molars varies significantly.The basis of a dental practitioner's ability to evaluate and recommend appropriate treatment is based on a sound understanding of anatomical features.Match the descriptions with the appropriate teeth.
a.Small distal cusp
b.Cusp of Carabelli
c.Four equal cusps
d.Often has two fused roots
e.Calcifies at three years of age
Mandibular first molar

Question 33

MATCHING
Root and crown anatomy of molars varies significantly.The basis of a dental practitioner's ability to evaluate and recommend appropriate treatment is based on a sound understanding of anatomical features.Match the descriptions with the appropriate teeth.
a.Small distal cusp
b.Cusp of Carabelli
c.Four equal cusps
d.Often has two fused roots
e.Calcifies at three years of age
Maxillary second molar

Question 34

Roots of the mandibular molars are inclined mesially.

Question 35

MATCHING
Root and crown anatomy of molars varies significantly.The basis of a dental practitioner's ability to evaluate and recommend appropriate treatment is based on a sound understanding of anatomical features.Match the descriptions with the appropriate teeth.
a.Small distal cusp
b.Cusp of Carabelli
c.Four equal cusps
d.Often has two fused roots
e.Calcifies at three years of age
Mandibular third molar