Dentin Tissue Structure

Question 1

Composition of dentin?

Answer 1

70% inorganic and 30% water/organic material

Question 2

What makes up the basic unit of structure of dentin?

Answer 2

• Dentinal tubule
• Peritubular dentin
• Intertubular dentin

Question 3

Where does secondary dentin form?

Answer 3

Inside primary dentin

Question 4

When does secondary dentin form?

Answer 4

When the tooth first occlues with an opposing tooth

Question 5

What happens when secondary dentin is formed?

Answer 5

The pulp chambers decrease in size

Question 6

Location of odontoblast cell bodies?

Answer 6

Outside of the calcified dentin

Question 7

Reason for the location of odontoblast cell bodies?

Answer 7

To produce secondary and reparative dentin

Question 8

What are the three types of trauma that cause the formation of reparative dentin?

Answer 8

Occlusal, chemical, and mechanical

Question 9

Reparative dentin: occlusal trauma

Answer 9

Reparative dentin is produced in response to malocclusion

Question 10

Reparative dentin: chemical trauma

Answer 10

Chemical trauma is cause by chemicals found within material used in restorations or bacterial decay (i.e. lemon juice, gastric acid, etc.)

Question 11

Reparative dentin: mechanical trauma

Answer 11

Mechanical trauma is due to cavity preparations that extend into the dentin