Question 1

Which of the following sensations can the nerves of the periodontal fibers transmit (select all that apply)?

Accepted Answer

A)  Pain 
B)  Heat 
C)  Cold 
D)  Pressure 
E) Not of above 
A)  Pain 
B)  Heat 
C)  Cold 
D)  Pressure 
E) Not of above A, B, C, D

Question 2

Acellular cementum contains trapped cementoblasts because they remain in the matrix after secretion.

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. E

Question 3

The epithelial root sheath is between the dental papilla and the dental sac in early root development.

Accepted Answer

A) True 
 B)False  True

Question 4

The periodontal ligament develops from the mesodermal cells of the dental sac.

Accepted Answer

A) True 
 B)False

Question 5

Root sheath cells that remain in the periodontal space are called epithelial rest cells. If they later divide they form epithelial rests of Malassez.

Accepted Answer

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

Question 6

Enamel pearls (select all that apply):

Accepted Answer

A)  Are formed by cementocytes 
B)  Are usually found in root furcations 
C)  Are small elevators of enamel 
D)  Dissolve after root completion 
E)  Often cause periodontal cysts 
A)  Are formed by cementocytes 
B)  Are usually found in root furcations 
C)  Are small elevators of enamel 
D)  Dissolve after root completion 
E)  Often cause periodontal cysts

Question 7

The outer layer of cementum is lined with cementoblasts. Cementum has limited ability to form throughout adulthood.

Accepted Answer

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

Question 8

The alveolar bone that forms the tooth socket has a normal periosteum because this bone contains numerous holes that allow for passage of blood vessels.

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

The epithelial diaphragm is parallel to the root sheath.

Accepted Answer

A) True 
 B)False

Question 10

In the two cross-sectional views of alveolar bone depicted below, structure "c" illustrates the

Accepted Answer

A)  Spongy bone 
B)  Cribriform plate 
C)  Cortical plate 
A)  Spongy bone 
B)  Cribriform plate 
C)  Cortical plate

Question 11

Each of the following defects can occur during or after the breakup of the epithelial root sheath EXCEPT one. Which one is the EXCEPTION?

Accepted Answer

A)  Periodontal cysts 
B)  Accessory root canals 
C)  Hypercementosis 
D)  Enamel pearls 
E)  Epithelial rests of Malassez 
A)  Periodontal cysts 
B)  Accessory root canals 
C)  Hypercementosis 
D)  Enamel pearls 
E)  Epithelial rests of Malassez

Question 12

Root formation begins at the cementoenamel junction (CEJ) and proceeds to the root apex. During this process the epithelial root sheath becomes the epithelial diaphragm.

Accepted Answer

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

Question 13

The transseptal fibers run from the cementum into the free and attached gingival area. The alveolodental fibers run from the cementum to the alveolar bone.

Accepted Answer

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

Question 14

The compact bone that is perforated in many places is the

Accepted Answer

A)  Cortical plate 
B)  Cribriform plate 
C)  Bundle bone 
D)  Cancellous bone 
A)  Cortical plate 
B)  Cribriform plate 
C)  Bundle bone 
D)  Cancellous bone

Question 15

In the two cross-sectional views of alveolar bone depicted below, structure "b" illustrates the

Accepted Answer

A)  Cribriform plate 
B)  Spongy bone 
C)  Cortical plate 
A)  Cribriform plate 
B)  Spongy bone 
C)  Cortical plate

Question 16

Which of the following indicates occlusal trauma?

Accepted Answer

A)  A thickened lamina dura 
B)  A layer of spongy bone 
C)  Pointed (or pyramidal-shaped) interproximal alveolar bone 
D)  Sharpey's fibers in the alveolar bone 
A)  A thickened lamina dura 
B)  A layer of spongy bone 
C)  Pointed (or pyramidal-shaped) interproximal alveolar bone 
D)  Sharpey's fibers in the alveolar bone

Question 17

Sharpey's fibers are part of the cementum. They are embedded in alveolar bone.

Accepted Answer

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

Question 18

Root formation begins after the full crown has been calcified.

Accepted Answer

A) True 
 B)False

Question 19

Development of the dentinocemental junction (DCJ) involves newly formed odontoblasts and cementoblasts. The root sheath must separate from the dentinal surface to establish the dentinocemental junction (DCJ).

Accepted Answer

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

Question 20

The organic components in cementum are (select all that apply):

Accepted Answer

A)  Mucopolysaccharides 
B)  Hydroxyapatite crystals 
C)  Collagen fibers 
D)  Mineral salts 
E)  Water 
A)  Mucopolysaccharides 
B)  Hydroxyapatite crystals 
C)  Collagen fibers 
D)  Mineral salts 
E)  Water

Exam 21: Root Formation and Attachment Apparatus

Which of the following sensations can the nerves of the periodontal fibers transmit (select all that apply)?

Acellular cementum contains trapped cementoblasts because they remain in the matrix after secretion.

The epithelial root sheath is between the dental papilla and the dental sac in early root development.

The periodontal ligament develops from the mesodermal cells of the dental sac.

Root sheath cells that remain in the periodontal space are called epithelial rest cells. If they later divide they form epithelial rests of Malassez.

Enamel pearls (select all that apply):

The outer layer of cementum is lined with cementoblasts. Cementum has limited ability to form throughout adulthood.

The alveolar bone that forms the tooth socket has a normal periosteum because this bone contains numerous holes that allow for passage of blood vessels.

The epithelial diaphragm is parallel to the root sheath.

In the two cross-sectional views of alveolar bone depicted below, structure "c" illustrates the

Each of the following defects can occur during or after the breakup of the epithelial root sheath EXCEPT one. Which one is the EXCEPTION?

Root formation begins at the cementoenamel junction (CEJ) and proceeds to the root apex. During this process the epithelial root sheath becomes the epithelial diaphragm.

The transseptal fibers run from the cementum into the free and attached gingival area. The alveolodental fibers run from the cementum to the alveolar bone.

The compact bone that is perforated in many places is the

In the two cross-sectional views of alveolar bone depicted below, structure "b" illustrates the

Which of the following indicates occlusal trauma?

Sharpey's fibers are part of the cementum. They are embedded in alveolar bone.

Root formation begins after the full crown has been calcified.

Development of the dentinocemental junction (DCJ) involves newly formed odontoblasts and cementoblasts. The root sheath must separate from the dentinal surface to establish the dentinocemental junction (DCJ).

The organic components in cementum are (select all that apply):

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

Enamel, Dentin, and Pulp

Eruption and Shedding of Teeth

Oral Mucous Membrane

The Tongue

Salivary Glands

Osteology of the Skull

Nose, Nasal Cavity, and Paranasal Sinuses

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

Temporomandibular Joint

Muscles of Facial Expression

Soft Palate and Pharynx

Arterial Supply and Venous Drainage

Salivary Glands

Nervous System

Lymphatics and Spread of Dental Infection

Filters