Eruption - Apposition/Maturation Stages

Question 1

True or False; enamel, dentin, and cementum use the same processes in development with the exception of apposition.

Answer 1

True; they are deposited in layers but develop different matrices (apposition)

Question 2

What is apposition?

Answer 2

The function of cells creating a matrix.

Question 3

What is maturation?

Answer 3

The mineralization of a matrix.

Question 4

How is the mineralization of a matrix possible?

Answer 4

By the addition of hydroxyapatite.

Question 5

What mineralized tissues are avascular (without)?

Answer 5

Enamel
Dentin
Cementum

Question 6

What is significant about avascular tissue?

Answer 6

Because they do not have vascularity they do not have the raw materials available to repair themselves.

Question 7

What tissue is vascular?

Answer 7

Alveolar Bone

Question 8

What determines the degree of mineralization of tissues?

Answer 8

The type of matrix.

Question 9

What percentage of enamel is mineralized?

Answer 9

96%

Question 10

What percentage of dentin is mineralized?

Answer 10

70%

Question 11

What percentage of cementum is mineralized?

Answer 11

65%

Question 12

What percentage of alveolar bone mineralized?

Answer 12

60%

Question 13

The amount of mineralization is directly related to what?

Answer 13

The strength (hardness) of the tissue.

Question 14

What is the hardest tissue?

Answer 14

Enamel