Deck 10: Cementum

Question 1

Which condition occurs most often?

A) Cementum meets the enamel.
B) Cementum forms on the enamel.
C) Enamel forms over the cementum.
D) A gap occurs between the cementum and enamel.

Answer 1

B

Question 2

The area where cemental resorption stops and deposition begins is called a

A) cementicle.
B) reversal line.
C) cementoblast.
D) cementocyte.

Answer 2

B

Question 3

At which of the following the cementum is thickest?

A) Apex of the root
B) Cementoenamel junction
C) Cervical region of the root
D) Furcation of multirooted teeth

Answer 3

A

Question 4

Which of the following is found in both bone and cementum?

A) Blood vessels
B) Nerves
C) Cells in lacunae
D) Haversian or Volkmann canals

Question 5

Cementocytes found deep in the cementum have _________ organelles than those found near the surface of the cementum.

A) more
B) fewer
C) larger
D) smaller

Question 6

Why does aging cementum appear to have a rough surface?

A) Extrinsic wear and occlusal force.
B) Calcification of ligament fiber bundles.
C) Obstruction of the pattern of incremental lines.
D) Cementoblasts cannot repair cementum after resorption.

Question 7

Which of the following best defines a cementicle?

A) An ovoid calcification in the periodontal ligament (PDL)
B) A spindle-shaped cell found in the connective tissue
C) A flattened and elongated cell found in the coronal portions of the pulp
D) An irregularly shaped calcified mass appearing in the canal of the pulp

Question 8

Which is the preferred term for the first layer of cementum that is deposited by the inner layer of the epithelial cells of the root sheath?

A) Cementoid layer
B) Intermediate cementum
C) Celluluar cementum
D) Acellular cementum

Question 9

Why is cementum insensitive to pain?

A) Cementum is more permeable than dentin.
B) Dentin forms more quickly than cementum.
C) Cells deep within the cementum are less active.
D) Cementum has no nerve or blood vessel innervation.

Question 10

A continuing increase of cementum due to aging may obstruct the

A) apical canal.
B) periodontal ligament space.
C) occlusion.
D) pulp horns.

Question 11

Some __________ have long processes that lie in canaliculi.

A) lacunae
B) cementicles
C) cementocytes
D) collagen fibers

Question 12

Intermediate cementum lies between the ___________ and the secondary cementum.

A) enamel
B) periodontal tissue
C) granular layer of Tomes
D) cellular-acellular cementum

Question 13

Which of the following is formed by cementoblasts and maintained by cementocytes?

A) Extrinsic fiber bundles
B) Intrinsic fibers of cementum
C) Calcified ligament fiber bundles
D) Principal fibers of the periodontal ligament.

Question 14

The intermediate layer of cementum is _____ thick.

A) 10 cm
B) 10 mm
C) 10 µm
D) 10 nm

Question 15

Which percentage of collagen is found in organic cementum?

A) 20% to 25%
B) 30% to 35%
C) 40% to 45%
D) 50% to 55%

Question 16

Which of the following best defines the term ankylosis?

A) Alveolar bone fuses with cementum.
B) The cementum fuses with underlying dentin.
C) Alveolar bone fuses with the PDL ligament.
D) The cementum of two adjacent teeth fuses together.

Question 17

Following resorption,cemental repair is a function of

A) odontoblasts.
B) ameloblasts.
C) cementoblasts.
D) cementocytes.

Question 18

Incremental lines in cementum indicate _________.

A) trauma
B) rhythmic deposition
C) developmental anomalies
D) the presence of odontocytes

Question 19

In what percentage of cases does cementum meet enamel?

A) 0%
B) 10%
C) 30%
D) 60%

Question 20

Cementum resorption is rare,even in older patients.In fact,cementum is more resistant to resorption than bone.

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

Question 21

Intermediate cementum overlies dentin.

Question 22

Cementum is devoid of elastic fibers.

Question 23

Young children frequently develop free cementicles.

Question 24

Inner root sheath cells form the cellular-acellular cementum.

Question 25

Cementum forms more rapidly than dentin.

Question 26

Intermediate cementum forms completely,before the deposition of secondary cementum begins.

Question 27

Cementum is lustrous pale yellow in color.

Question 28

The majority of cementocytes reside within the apical cementum.

Question 29

Cementum is highly vascularized.

Question 30

Intermediate cementum is softer than dentin.

Question 31

What does OMG stand for in terms of cementum formation?

A) Overlap,meet,and gap
B) Overwhelming marginal gingivitis
C) Obstructive meeting group
D) Odontoblast meeting gingiva

Question 32

The initial layer of cementum contains an enamelin-like protein.

Question 33

Cementum resorption is a characteristic of aging cementum.