Reactions of Dentine-Pulp Complex

Question 1

What common ancestry do dentine and pulp both share?

Answer 1

Dental papilla

Question 2

What type of collagen does dentine contain?

Answer 2

Type I collagen

Question 3

What types of collagen does pulp contain?

Answer 3

• Type I
• Type III
• Type V

Question 4

Why does peripheral dentine not contain Type IV collagen?

Answer 4

Peripheral dentine does not have a basement membrane so no Type IV collagen

Question 5

Does dentine contain fibronectin?

Answer 5

No

Question 6

What is the concept of the dentine pulp complex?

Answer 6

Dentine pulp complex is a dynamic tissue that responds mechanical, bacterial and chemical stimuli as a functional unite

Question 7

What is dentine?

Answer 7

Dentine is a living tissue with a high water content that can react to changes in its environment

Question 8

Which is the only tissue in the tooth that is innervated? (have nerve supply)

Answer 8

Dentine

Question 9

-

Answer 9

-

Question 10

What is primary dentine formed by?

Answer 10

Primary dentine is formed by the odontoblasts during the development of the tooth

Question 11

When is secondary dentine laid down?

Answer 11

Odontoblasts continue to deposit secondary dentine slowly throughout the life of the tooth

Question 12

What are odontoblast processes?

Answer 12

Dentinal tubules in the inner part of dentine contain extensions of cells from the pulp called odontoblast processes

Question 13

What is dentinal fluid?

What is it derived from?

Answer 13

• Fluid found in dentinal tubules

- Derived from the pulpal extracellular fluid

Question 14

What do pulpal blood vessels do?

Answer 14

Supply nutrients and structural materials to dentine

Question 15

Do humans have pulpal blood vessels?

Answer 15

No

Question 16

What do pulpal nerves do? (2)

Answer 16

• Mediate dentine sensitivity

- Regulating secondary and tertiary dentine deposition

Question 17

When may dentine become an inert tissue incapable of any response or repair? (2)

Answer 17

• If dental pulp dies

- Removed in endodontic treatment

Question 18

What implications may arise from dentine becoming an inert tissue (non-vital state)? (2)

Answer 18

• Tooth discolours

- Tooth may fracture under masticatory forces

Question 19

What is the main aim of the dentine-pulp complex reaction?

Answer 19

Reducing the permeability of dentine

Question 20

What may be the fate of odontoblasts and other pulpal cells beneath the lesion, if injury becomes extensive?

Answer 20

May kill the odontoblasts and other pulpal cells beneath the lesion

Question 21

Following death of odontoblasts due to injury what cells may take it place?
What do they do?

Answer 21

Odontoblast-like cells that secrete a reparative tertiary dentine

Question 22

-

Answer 22

-

Question 23

The use of cutting burs produce vibrations, what does this cause in terms of fluid?

Answer 23

Causing continuous inward and outward fluid shifts

Question 24

What is a consequence of continuous inward and outward fluid shifts?

Answer 24

• Barrage of hydrodynamic stimuli across the dentine into the dental pulp
• Which causes pain

Question 25

What may arise if dentine after treatment is not sealed well? (2)

Answer 25

• Micro-leakage within the restoration
• Acute pulpal reactions into chronic stage due to
  micro-organisms and their products