Deck 11: Root Morphology

Question 1

Mandibular premolars typically have two pulp canals.Maxillary first premolars are more likely than maxillary second premolars to have two pulp canals.

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 1

C
Mandibular premolars usually have only one canal.Maxillary premolars often have two canals;the first is more likely to have two canals than the second.

Question 2

Dentin tubules can carry a stimulus from the root surface to the nerves in the pulp canal.

Answer 2

True
Nerves within the pulp canal can be stimulated in various manners.The most common way is for dentin tubules to carry a stimulus from the root surface through dentin tubules to the nerve tissue lining the root canal.

Question 3

Orthodontics requires a sustained pressure to move teeth to a new location.Osteoblasts respond to the new location by forming new bone.

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

A
Orthodontics,the gradual movement of teeth to a new location,is accomplished by exerting a sustained pressure for a prolonged time period.While osteoblastic (bone formative)activity is essential to formation of new bone in the new location,osteoclastic (bone destructive)activity is also necessary to dissolve bone so that teeth will move.

Question 4

A patient who has sensitivity in the mandibular anterior area due to abrasion is interested in having her teeth bleached.Which factor could contribute to her sensitivity?

A) Discolored teeth
B) Thin,uneven cementum
C) Root canal treatment on mandibular central incisors
D) Slight mobility

Question 5

Each of the following is a characteristic of the periodontal ligament EXCEPT one.Which one is the EXCEPTION?

A) Capable of regeneration
B) Capable of compression
C) Provides tension
D) Provides support

Question 6

Which of the following travel through the apical foramen (Select all that apply. )?

A) Nerves
B) Enamel pearls
C) Blood vessels
D) Nutrients
E) Lymphatic vessels

Question 7

Maxillary molar root trifurcations are located on each of the following surfaces EXCEPT one.Which one is the EXCEPTION?

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

Question 8

Root pain due to exposed dentin is caused by gingival recession.Exposed spots of dentin can stimulate pulpal nerves through the cementoenamel junction (CEJ).

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 figure below shows a mesial view (A)and a distal view (B)of a linguobuccal section.Identify the tooth.

A) Mandibular first premolar
B) Mandibular second premolar
C) Mandibular first molar
D) Mandibular second molar

Question 10

Teeth with curved roots afford resistance to apical and distal forces but are vulnerable to occlusal forces.Roots with triangular cross section are particularly vulnerable to lateral displacement.

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 11

A slight amount of mobility is not considered normal.Orthodontics can help with bone remodeling that can prevent even slight tooth mobility.

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

Cementum formed during hypercementosis is different from the cementum lining the root because this newly formed product can continue to grow and add on to itself.

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 13

Pressure and temperature responses are elicited by all of the following EXCEPT one.Which one is the EXCEPTION?

A) Bone
B) Periodontal ligament
C) Gingiva
D) Pulp tissue

Question 14

Root canal therapy in third molars is considered very unpredictable because the tooth is located so far distally in the mouth.

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

During hypercementosis,excess cementum is deposited

A) along the CEJ
B) irregularly,throughout the root surface
C) at the dentinocemental junction
D) at the apex of the root

Question 16

Which of the following best describes the root canal opening(s)in the figure "A" below?

A) Accessory root canals
B) One main and one accessory root canal
C) Two apical root canals

Question 17

Pain within the root (root pain)can be elicited by which of the following (Select all that apply. )?

A) Root decay
B) Root resorption
C) Secondary dentin
D) Dehydration
E) Reparative dentin

Question 18

Each of the following teeth frequently has two roots EXCEPT one.Which one is the EXCEPTION?

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

Question 19

Each of the following root characteristics provides significant resistance to displacement from traumatic forces EXCEPT one.Which one is the EXCEPTION?

A) Root grooves
B) Root concavities
C) A short,smooth root
D) Multiple roots

Question 20

Blood vessels traveling through the apical foramen support nerves and odontoblasts because blood supply enables delivery of essential nutrients as well as removal of harmful products.

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 21

MATCHING
Knowledge of anatomic features unique to root morphology is essential to assessment of periodontal and dental health.Match each anatomic feature with its corresponding description.
a.Rough cementum
b.Opening at apex
c.Cementum meets enamel
d.Cementoma
e.Enamel pearl
f.Accessory canal(s)
g.Secondary dentin
Root surface

Question 22

The cementum covering the root is thick and smooth when first formed.

Question 23

MATCHING
Knowledge of anatomic features unique to root morphology is essential to assessment of periodontal and dental health.Match each anatomic feature with its corresponding description.
a.Rough cementum
b.Opening at apex
c.Cementum meets enamel
d.Cementoma
e.Enamel pearl
f.Accessory canal(s)
g.Secondary dentin
Apex

Question 24

MATCHING
Knowledge of anatomic features unique to root morphology is essential to assessment of periodontal and dental health.Match each anatomic feature with its corresponding description.
a.Rough cementum
b.Opening at apex
c.Cementum meets enamel
d.Cementoma
e.Enamel pearl
f.Accessory canal(s)
g.Secondary dentin
Furcation

Question 25

MATCHING
Knowledge of anatomic features unique to root morphology is essential to assessment of periodontal and dental health.Match each anatomic feature with its corresponding description.
a.Rough cementum
b.Opening at apex
c.Cementum meets enamel
d.Cementoma
e.Enamel pearl
f.Accessory canal(s)
g.Secondary dentin
Apical foramen

Question 26

Mandibular second molars often have two canals in each root.

Question 27

MATCHING
Knowledge of anatomic features unique to root morphology is essential to assessment of periodontal and dental health.Match each anatomic feature with its corresponding description.
a.Rough cementum
b.Opening at apex
c.Cementum meets enamel
d.Cementoma
e.Enamel pearl
f.Accessory canal(s)
g.Secondary dentin
Pulp chamber

Question 28

MATCHING
Knowledge of anatomic features unique to root morphology is essential to assessment of periodontal and dental health.Match each anatomic feature with its corresponding description.
a.Rough cementum
b.Opening at apex
c.Cementum meets enamel
d.Cementoma
e.Enamel pearl
f.Accessory canal(s)
g.Secondary dentin
CEJ

Question 29

Root pain always means that dental caries is present.

Question 30

If there are two pulp canals in a root,there could be one or two openings in the root.

Question 31

MATCHING
Knowledge of anatomic features unique to root morphology is essential to assessment of periodontal and dental health.Match each anatomic feature with its corresponding description.
a.Rough cementum
b.Opening at apex
c.Cementum meets enamel
d.Cementoma
e.Enamel pearl
f.Accessory canal(s)
g.Secondary dentin
Lateral foramen