(4) dentino-pulpal complex - Intratubular dentin

Question 1

What does intratubular dentin lack?

Answer 1

Lacks collagen matrix

Question 2

Is intratubular dentin more or less mineralised than intertubular dentin?

Answer 2

More 15%

Question 3

Name structures A-C

Answer 3

Question 4

What is the main protein of intratubular dentin?

Answer 4

different from phosphophoryn

Question 5

What is the main inorganic component of the intratubular dentin?

Answer 5

mainly carbonated apatite with a different crystalline form.

Some hypocalcified areas

Question 6

How can ageing effect the root intratubular dentin?

Answer 6

Physiologic ageing in root dentine leads to complete obliteration of the tubules with intratubular dentine.

Question 7

What does this image show?

Answer 7

complete obliteration of the tubules with intratubular dentine.
* Same refractive index as intertubular dentine.
* These areas appear translucent when put in water.

Question 8

When can dentin be translucent?

Answer 8

Ageing causes obliteration on intra and intertubular dentin

Placed in water

Question 9

What causes the butterfly shape of dentin?

Answer 9

Translucent dentine has a butterfly shape in cross section.
* This is due to the convergence of the tubules.

Question 10

What does this image demonstrate?

Answer 10

Translucent dentine has a butterfly shape in cross section.
* This is due to the convergence of the tubules.
* Increases with age.
* Forensic dentistry.

Question 11

What are the contents of the dentnal tubules?

Answer 11

Odontoblastic processes.
* Afferent nerve terminals.
* artificial pulp chmaber
* Extracellular dentinal fluid.