4. Restoring Endodontically Treated Teeth

Question 1

How much ferule on tooth structure is needed for retention and resistance form?

Answer 1

1.5 to 2.00 minimum

Question 2

What is the sole reason for a post?

Answer 2

To provide resistance and retention for a core

Question 3

What are the criteria for a coronal-radicular amalgam?

Answer 3

1. Using the pulp chamber and canals to place amalgam. “Shoeing cusps” with 2 mm of amalgam.
2. Pulp chamber must have 4 mm of depth

Question 4

What bur to use when instrumenting canal?
How much gutta percha to leave behind?
How much dentin wall to leave behind?

Answer 4

Peeso reamer
4-5 mm behind
Leave 1-1.5 mm dentin wall

Question 5

Resin cores - Disadvantages

Answer 5

• Water sorption - hygroscopic expansion

- Not dimensionally stable - setting shrinkage

Question 6

GI cores - Disadvantages

Answer 6

• Lack of adequate strength (flexural and tensile)

- Sensitivity to moisture

Question 7

How to surface treat posts?

Answer 7

1. Airborne-particle abraded with 50-um aluminum oxide particles (increase retention for cemented)