Question 1

An enamel spindle is an ameloblastic process that becomes trapped in dentin.Enamel spindles form in early development and are seen only histologically.

Accepted Answer

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. 
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 2

Hundreds of odontoblasts are damaged when restoration is prepared and placed within a tooth.Sclerotic dentin forms in response to the trauma.

Accepted Answer

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. 
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 3

The dental papilla is derived from the ectoderm.It determines the shape of the developing crown.

Accepted Answer

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. 
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 4

Pulp tissue consists of blood vessels,lymphatic vessels,nerves,fibroblasts,and collagen fibers.The nerves of the pulp are primarily sensory and transmit both pain and thermal sensations.

Accepted Answer

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. 
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

Each of the following accurately describes hypocalcified enamel EXCEPT one.Which one is the EXCEPTION?

Accepted Answer

A)  Hydroxyapatite crystals are not full size. 
B)  The tooth may be more caries prone. 
C)  Enamel is less dense. 
D)  Enamel is more than 96% inorganic. 
A)  Hydroxyapatite crystals are not full size. 
B)  The tooth may be more caries prone. 
C)  Enamel is less dense. 
D)  Enamel is more than 96% inorganic.

Question 6

The primary abnormality seen in pulp is pulp stones.

Accepted Answer

A) True 
 B)False

Question 7

Which of the following are true of pulp stones (Select all that apply. )?

Accepted Answer

A)  They are small,circular,calcified areas. 
B)  They occur in about 50% of people aged 70 to 80 years. 
C)  True pulp stones originate from ameloblasts. 
D)  False stones are most common. 
E)  False stones resemble an onion cut in cross section. 
A)  They are small,circular,calcified areas. 
B)  They occur in about 50% of people aged 70 to 80 years. 
C)  True pulp stones originate from ameloblasts. 
D)  False stones are most common. 
E)  False stones resemble an onion cut in cross section.

Question 8

Young people are less susceptible to permanent pulpal damage than older people because with age the smaller pulp loses its reserve cells and is less able to resist trauma.

Accepted Answer

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. 
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 9

Enamel,dentin,and pulp develop from enamel organ.Enamel is derived from ectoderm whereas dentin and pulp are derived from mesoderm.

Accepted Answer

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. 
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

Once formed,the often stained primary cuticle can be removed by (Select all that apply. ):

Accepted Answer

A)  Regular toothbrushing 
B)  Dental scaling 
C)  Dental prophylaxis 
D)  Tooth bleaching 
A)  Regular toothbrushing 
B)  Dental scaling 
C)  Dental prophylaxis 
D)  Tooth bleaching

Question 11

After the ameloblast secretes the primary enamel cuticle it is called the reduced enamel epithelium because it becomes flattened and blends with outer enamel epithelial cells.

Accepted Answer

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. 
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 12

Tooth development is first seen at the incisal edge or cusp tip.

Accepted Answer

A) True 
 B)False

Question 13

During the maturation stage of calcification,an ameloblast produces enamel at what rate?

Accepted Answer

A)  0.02 mm per hour 
B)  2 mm per day 
C)  4 mm per day 
D)  10 mm per hour 
A)  0.02 mm per hour 
B)  2 mm per day 
C)  4 mm per day 
D)  10 mm per hour

Exam 20: Enamel, Dentin, and Pulp

An enamel spindle is an ameloblastic process that becomes trapped in dentin.Enamel spindles form in early development and are seen only histologically.

Hundreds of odontoblasts are damaged when restoration is prepared and placed within a tooth.Sclerotic dentin forms in response to the trauma.

The dental papilla is derived from the ectoderm.It determines the shape of the developing crown.

Pulp tissue consists of blood vessels,lymphatic vessels,nerves,fibroblasts,and collagen fibers.The nerves of the pulp are primarily sensory and transmit both pain and thermal sensations.

Each of the following accurately describes hypocalcified enamel EXCEPT one.Which one is the EXCEPTION?

The primary abnormality seen in pulp is pulp stones.

Which of the following are true of pulp stones (Select all that apply. )?

Young people are less susceptible to permanent pulpal damage than older people because with age the smaller pulp loses its reserve cells and is less able to resist trauma.

Enamel,dentin,and pulp develop from enamel organ.Enamel is derived from ectoderm whereas dentin and pulp are derived from mesoderm.

Once formed,the often stained primary cuticle can be removed by (Select all that apply. ):

After the ameloblast secretes the primary enamel cuticle it is called the reduced enamel epithelium because it becomes flattened and blends with outer enamel epithelial cells.

Tooth development is first seen at the incisal edge or cusp tip.

During the maturation stage of calcification,an ameloblast produces enamel at what rate?

Oral Cavity

The Tooth: Functions and Terms

Fundamental and Preventive Curvatures

Dentition

Development, form, and Eruption

Occlusion

Dental Anomalies

Supporting Structures

Clinical Considerations

Tooth Identification

Root Morphology

Incisors

Canines

Premolars

Molars

Deciduous Dentition

Basic Tissues

Development of Orofacial Complex

Dental Lamina and Enamel Organ

Root Formation and Attachment Apparatus

Eruption and Shedding of Teeth

Oral Mucous Membrane

The Tongue

Histology of the Salivary Glands

Osteology of the Skull

Nose, Nasal Cavity, and Paranasal Sinuses

Muscles of Mastication, Hyoid Muscles, and Sternocleidomastoid and Trapezius Muscles

Tempo-romandibular Joint

Muscles of Facial Expression

Soft Palate and Pharynx

Arterial Supply and Venous Drainage

Salivary Glands

Nervous System

Lymphatics and Spread of Dental Infection

Anatomical Considerations of Local Anesthesia

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