Deck 8: Dentin

Question 1

The defining characteristic of globular dentin is

A) interglobular spaces.
B) lamellae.
C) The presence of ameloblasts.
D) sclerotic dentin.

Answer 1

A

Question 2

Incremental lines in dentin are also known as

A) lines of von Ebner.
B) the smear layer.
C) the granular layer of Tomes.
D) canaliculi.

Answer 2

A

Question 3

_______ are extensions of the odontoblast process into enamel.

A) Dead tracts
B) Neonatal lines
C) Enamel spindles
D) Lines of von Ebner

Answer 3

C

Question 4

Which is the following is a hypermineralized collar of dentin surrounding the tubules?

A) Sclerotic dentin
B) Peritubular dentin
C) Intertubular dentin
D) Interglobular dentin

Question 5

The granular layer of Tomes is located in the _________.

A) dentin of the root
B) dentin of the crown
C) periodontal ligament
D) cementum of the root

Question 6

Mantle dentin contains larger collagen fibers than circumpulpal dentin.

Question 7

The appositional growth of dentin is apparent in which feature?

A) Incremental lines
B) Lateral canaliculi
C) Transparent dentin
D) Interglobular spaces

Question 8

Which type of dentin separates mantle dentin from circumpulpal dentin?

A) Granular
B) Globular
C) Transparent
D) Reactionary

Question 9

Which term is preferred to describe when newly recruited (replacement)odontoblasts begin depositing dentin?

A) Reactionary dentin
B) Response dentin
C) Reparative dentin
D) Secondary dentin

Question 10

Which type of dentin forms to protect and maintain the vitality of the pulp?

A) Mantle
B) Sclerotic
C) Peritubular
D) Reactionary

Question 11

Which type of dentin is formed prior to tooth function and is the major component of the crown and root of the tooth?

A) Mantle dentin
B) Circumpulpal dentin
C) Secondary dentin
D) Tertiary dentin

Question 12

Dentin is _______ than enamel.

A) harder
B) more elastic
C) a whiter shade
D) less radiolucent

Question 13

Odontoblastic injury during a cavity preparation usually results in which of the following forms of dentin?

A) Primary mantle dentin
B) Primary globular dentin
C) Secondary dentin
D) Tertiary dentin

Question 14

Peritubular dentin is not found in the dentinal tubules of interglobular dentin.

Question 15

Which type of dentin borders the pulp?

A) Globular
B) Predentin
C) Reactionary
D) Circumpulpal

Question 16

Mineralized tubules are associated with which type of dentin?

A) Mantle
B) Sclerotic
C) Reparative
D) Secondary

Question 17

Sclerotic dentin is found in each of the following areas EXCEPT one.Which one is the EXCEPTION?

A) Abrasion
B) Fracture
C) Living odontoblasts
D) Caries of enamel

Question 18

Which of the following best defines sclerotic dentin?

A) The dentinal matrix that immediately surrounds the dentinal tubule.
B) The first dentin formed and deposited at the dentinoenamel junction.
C) Dentin directly underlying mantle dentin,comprising the bulk of primary dentin.
D) Obliterated tubules,found mainly in areas of attrition,abrasion,fracture,and caries.

Question 19

The major organic component of dentin is _______.

A) water
B) collagen
C) enamelin
D) hydroxyapatite

Question 20

Secondary dentin is the result of insufficient mineralization.

Question 21

Secondary dentin is deposited more quickly than primary dentin.

Question 22

Interglobular dentin is associated with vitamin B deficiency.

Question 23

Osteodentin is a form of reparative dentin that resembles cartilage.

Question 24

Odontoblasts have a singular process when they first differentiate.

Question 25

Dentinal tubules contain odontoblast processes,nerve terminals,and dentinal fluid.

Question 26

Dead tracts develop when odontoblasts die from trauma or old age.

Question 27

The junction between dentin and enamel is scalloped.

Question 28

Odontoblast organelles are usually located within the cytoplasmic process.

Question 29

Odontoblastic processes taper in diameter,being largest near the dentinoenamel junction and smallest near the pulp.

Question 30

Dentin is responsive to the environment.