Deck 13: Dentin and Pulp

Question 1

Which of the following terms associated with dentin can be used to correctly describe the type that makes up the largest part of the tooth's dentin?

A) Tomes granular layer
B) Mantle dentin
C) Circumpulpal dentin
D) Interglobular dentin

Answer 1

Circumpulpal dentin

Question 2

Lateral pulp canals within the pulp chamber extend:

A) from pulp tissue to the periodontal ligament.
B) vertically toward the cementum.
C) between two pulp canals, as a bridge.
D) from the chamber, parallel to another canal.

Answer 2

from pulp tissue to the periodontal ligament.

Question 3

The most common cell type in connective tissue such as the pulp is the:

A) endothelial cell.
B) fibroblast.
C) white blood cell.
D) odontoblast.

Answer 3

fibroblast.

Question 4

During tooth development,both the pulp and dentin in the mature tooth are products of the:

A) dental papilla.
B) enamel organ.
C) dental sac.
D) epithelium.

Question 5

What are the smaller extensions of coronal pulp into the cusps of posterior teeth termed?

A) Accessory canals
B) Lateral canals
C) Pulp horns
D) Pulp canals

Question 6

Which is the most common type of nerves associated with the pulp in a mature erupted tooth?

A) Myelinated
B) Unmyelinated
C) Myelinated and unmyelinated are in equal numbers
D) Neither myelinated and unmyelinated nerves are found in pulp

Question 7

During cavity preparation of a tooth,care must be taken to preserve the:

A) enamel rod fluid.
B) support of the dentinal tubules.
C) cemental vascularity.
D) vitality of the pulp.

Question 8

Which of the following pulp structures is formed when Hertwig epithelial root sheath encounters a blood vessel?

A) Pulp horn
B) Pulp chamber
C) Apical foramen
D) Accessory canal

Question 9

Dentin in a mature tooth is on the average about ____% mineralized by weight.

A) 50
B) 65
C) 70
D) 96

Question 10

In which location is the cell body of the odontoblast found in a mature,healthy erupted tooth?

A) Along the dentinoenamel junction
B) Along the outer pulpal wall
C) Near the dentinocemental junction
D) Near the pulpal core

Question 11

Dentin in the mature tooth is produced as a result of secretion by:

A) cementoblasts.
B) fibroblasts.
C) osteoblasts.
D) odontoblasts.

Question 12

Which of the following includes the tissue fluid surrounding the cell membrane of the odontoblast?

A) Lymph
B) Gingival crevicular fluid
C) Dentinal fluid
D) Synovial fluid

Question 13

Which of the following is the only sensation perceived by the brain from the pulp's sensory nerves?

A) Taste
B) Pain
C) Pressure
D) Temperature

Question 14

With increased age,the pulp tissue can become:

A) displaced by primary dentin.
B) increasingly fibrotic.
C) filled with cementicles.
D) increasingly cartilaginous.

Question 15

Which of the following zones in pulp is closest to the dentin?

A) Odontoblastic layer
B) Cell-rich zone
C) Pulpal core
D) Cell-free zone

Question 16

Predentin is the initial material laid down by the:

A) odontoblasts.
B) ameloblasts.
C) preameloblasts.
D) odontoclasts.

Question 17

The dark,arclike areas in histologic sections of a tooth are what type of dentin?

A) Tomes granular layer
B) Mantle dentin
C) Circumpulpal dentin
D) Interglobular dentin

Question 18

Secondary dentin usually forms within the tooth:

A) after the completion of the apical foramen.
B) before the completion of the apical foramen.
C) nearest to the dentinoenamel junction.
D) in response to tooth trauma.

Question 19

Which zone in the pulp contains a nerve and capillary plexus?

A) Odontoblastic layer
B) Cell-rich zone
C) Pulpal core
D) Cell-free zone

Question 20

Which of the following are a number of adjoining parallel imbrication lines that are present in stained dentin?

A) Lines of Retzius
B) Reversal lines
C) Arrest lines
D) Contour lines of Owen

Question 21

Which of the following statements is correct when considering accessory canals?

A) Teeth have a standard number.
B) Radiographs always indicate the number and position.
C) Gingival recession may expose the opening.
D) They are examined by placement of radiolucent materials.

Question 22

What type of dentin occurs when odontoblasts in the area of the traumatized tubules may perish because of the injury,but neighboring undifferentiated mesenchymal cells of the pulp can move to the area and become odontoblasts?

A) Reparative dentin
B) Reactive dentin
C) Sclerotic dentin
D) Mantle dentin

Question 23

The resorption process within the dentin can result in a clinically presentation of a:

A) silver-hued tooth.
B) pulp with stones.
C) pinkish crown color.
D) carious tooth.

Question 24

In what direction do the imbrication lines of von Ebner run?

A) At 45 degrees to the dentinoenamel junction
B) At 90 degrees to the dentinal tubules
C) At 45 degrees to the inner pulpal wall
D) At 90 degrees to the periodontal ligament

Question 25

Which of the following is not associated with dentinal hypersensitivity?

A) Enamel and cementum do not meet
B) Dentin exposed due to caries process
C) Blocking dentinal tubules
D) Branching of dentinal tubules