✨✨✨Embryology Knowledge Check 5 - Ch. 8: Dentin

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

Tertiary dentin

T/F: Dead tracts develop when odontoblasts die from trauma or old age.

True

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.

Obliterated tubules, found mainly in areas of attrition, abrasion, fracture, and caries.

_______ are extensions of the odontoblast process into enamel.

a. Dead tracts

b. Neonatal lines

c. Enamel spindles

d. Lines of von Ebner

Enamel spindles

Mineralized tubules are associated with which type of dentin?

a. Mantle

b. Sclerotic

c. Reparative

d. Secondary

Sclerotic

Which type of dentin borders the pulp?

a. Globular

b. Predentin

c. Reactionary

d. Circumpulpal

Predentin

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

a. Mantle

b. Sclerotic

c. Peritubular

d. Reactionary

Reactionary

T/F: Odontoblastic processes taper in diameter, being largest near the T junction and smallest near the pulp.

False

The major organic component of dentin is _______.

a. water

b. collagen

c. enamelin

d. hydroxyapatite

collagen

The appositional growth of dentin is apparent in which feature?

a. Incremental lines

b. Lateral canaliculi

c. Transparent dentin

d. Interglobular spaces

Incremental lines

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.

lines of von Ebner

T/F: Odontoblast organelles are usually located within the cytoplasmic process.

False

T/F: Odontoblasts have a singular process when they first differentiate.

False

T/F: Interglobular dentin is associated with vitamin B deficiency.

False

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

dentin of the root

Which type of dentin separates mantle dentin from circumpulpal dentin?

a. Granular

b. Globular

c. Transparent

d. Reactionary

Globular

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

Living odontoblasts

T/F: Osteodentin is a form of reparative dentin that resembles cartilage.

False

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

Reparative dentin

T/F: Peritubular dentin is not found in the dentinal tubules of interglobular dentin.

True

T/F: The junction between dentin and enamel is scalloped.

True

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

False

T/F: Mantle dentin contains larger collagen fibers than circumpulpal dentin.

True

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

Peritubular dentin

Dentin is _______ than enamel.

a. harder

b. more elastic

c. a whiter shade

d. less radiolucent

more elastic

The defining characteristic of globular dentin is:

a. interglobular spaces

b. lamellae

c. The presence of ameloblasts

d. sclerotic dentin.

interglobular spaces

T/F: Dentinal tubules contain odontoblast processes, nerve terminals, and dentinal fluid.

True

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

Reparative dentin

T/F: Secondary dentin is the result of insufficient mineralization.

False

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

Tertiary dentin

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

Circumpulpal dentin

T/F: Dentin is responsive to the environment.

True

T/F Dentin is responsive to the environment

true

T/F Secondary dentin is deposited more quickly than primary dentin

False