✨✨✨CHAPTER 8 - DENTIN

b. Which of the following best defines sclerotic dentin?

a. The dentinal matrix that immediately surrounds the dentinal tubule.

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.

D

The granular layer of Tomes is located in the _________.

a. dentin of the root

b. dentin of the crown

c. periodontal ligament

dentin.

d. cementum of the root

A

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

a. Mantle

b. Sclerotic

c. Peritubular

d. Reactionary

D

Which type of dentin separates mantle dentin from circumpulpal dentin?

a. Granular

b. Globular

c. Transparent

d. Reactionary

B

Which type of dentin separates mantle dentin from circumpulpal dentin?

a. Granular

b. Globular

c. Transparent

d. Reactionary

B

_______ are extensions of the odontoblast process into enamel.

a. Dead tracts

b. Neonatal lines

c. Enamel spindles

d. Lines of von Ebner

C

Dentin is _______ than enamel.

a. harder

b. more elastic

c. a whiter shade

d. less radiolucent

B

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

B

The appositional growth of dentin is apparent in which feature?

a. Incremental lines

b. Lateral canaliculi

c. Transparent dentin

d. Interglobular spaces

A

The major organic component of dentin is _______.

a. water

b. collagen

c. enamelin

d. hydroxyapatite

B

Which type of dentin borders the pulp?

a. Globular

b. Predentin

c. Reactionary

d. Circumpulpal

B

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

B

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

D

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

C

The defining characteristic of globular dentin is

a. interglobular spaces.

b. lamellae.

c. The presence of ameloblasts.

d. sclerotic dentin.

A

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.

A

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

C

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

True

Secondary dentin is the result of insufficient mineralization.

False

Mantle dentin contains larger collagen fibers than circumpulpal dentin.

True

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

False

Odontoblasts have a singular process when they first differentiate.

False

The junction between dentin and enamel is scalloped.

True

Odontoblast organelles are usually located within the cytoplasmic process.

False

Osteodentin is a form of reparative dentin that resembles cartilage.

False

Interglobular dentin is associated with vitamin B deficiency.

False

Secondary dentin is deposited more quickly than primary dentin.

False

Dentin is responsive to the environment.

True

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

True

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

True