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Question 1

What is the first zone of enamel caries, characterized by initial demineralization?

Answer 1

Translucent Zone

This zone may have a pore volume of 1% and is where the initial demineralization process preferentially dissolves some magnesium and carbonate.

Question 2

What is the second zone of enamel caries that has a pore volume of 2-4%?

Answer 2

Dark Zone

Young teeth lack this zone.

Question 3

What is the broadest zone of the enamel caries lesion, lying underneath the surface?

Answer 3

Body of the Lesion

At the periphery, the pore volume is 5%, centrally it is 25% or greater.

Question 4

What is the fourth zone of enamel caries, which is not much different from unaffected enamel?

Answer 4

Surface Zone

The pore volume increases from 0.1% (normal) to 1-5%.

Question 5

.

Answer 5

.

Question 6

What is the conical or triangular shape of dentin caries characterized by?

Answer 6

The apex facing towards the pulp and the base towards the dentinoenamel junction.

Question 7

What is the first zone of dentin caries, where parts of the dentinal tubules contain lipids?

Answer 7

Zone of Fatty Degeneration

Lipids originate from bacteria and degenerated Tomes’ processes.

Question 8

What is the second zone of dentin caries that acts as a barrier against bacterial and acid progression?

Answer 8

Zone of Dentinal Sclerosis

This transparent layer is important for dentinal resistance to caries progression.

Question 9

What is the third zone of dentin caries, characterized as a narrow zone ahead of the zone of infection?

Answer 9

Zone of Decalcification

Question 10

True or False: The mineralization in the Zone of Dentinal Sclerosis may result from the activity of odontoblasts.

Answer 10

True

Question 11

Fill in the blank: The internal cohesion of the enamel is still adequate to prevent _______ despite substantial subsurface loss of minerals.

Answer 11

cavitation