OCB02-1014 Structure and function of Enamel

Question 1

Why do caries occur?

Answer 1

Due o demineralisation of the hard tissues due to plaque acids

Question 2

What are fissures?

Answer 2

Grooves in the surface of the teeth

Question 3

Where is the thickness of the enamel the greatest?

Answer 3

Over the cusp tip

Question 4

What are mamillons?

Answer 4

Newly erupted incisor has small swelling on its incisal edge

Question 5

What is perikymata?

Answer 5

Grooves on the surface of the tooth

Question 6

What are tomes proces pits?

Answer 6

Tiny pits in the enamel on the surface of the tooth

Question 7

What are pearls?

Answer 7

Swellings on the cervical part of the tooth

Question 8

What are retzius lines?

Answer 8

Prominent incremental lines, most visible in the cervical 1/3rd of the tooth

Question 9

What are the 2 types of matrix proteins secreted by ameloblasts?

Answer 9

Amelogenin and non-amelgogenin

Question 10

How long does matrix secretion for a permanent molar take?

Answer 10

4-7 years

Question 11

What are Hunter-Schreger Bands?

Answer 11

Dark and light bands of enamel seen in longitudinal ground section
Formed by changes in direction between adjacent groups of prisms

Question 12

What are the purpose of hunter-schreger bands?

Answer 12

To strengthen enamel and prevent cracks from propagating through the tooth