Posts

Question 1

What is the function of a post?

Answer 1

Retains core (DOES NOT strengthen tooth)

Question 2

What clinical considerations must be taken when designing a post?

Answer 2

• Remaining coronal tooth
• Root width
• Root length
• Canal shape

Question 3

What types of posts are available?

Answer 3

• Prefabricated
• Metal/ fiber
• Parallel/ tapered
• Smooth/ serrated/ threaded

Question 4

When is stress produced on posts?

Answer 4

• Cementation
• Masticatory loading
• Post removal

Question 5

What is an ideal post deign?

Answer 5

1. Parallel sides (avoids wedging)
2. Non-threaded (avoids incorporating stress)
3. Cement retained (buffer between mast forces, post and tooth)

Question 6

How are posts removed?

Answer 6

• Ultrasonic
• Trephan e.g. Masseran
• Eggler device
• Moskito forceps
• Sliding hammer

Question 7

When is a post used for POSTERIOR teeth?

Answer 7

• Usually core retention can be obtained physically with undercuts

BUT IF NO CORONAL TISSUE…
- Post inserted into the longest straight canal

Question 8

What is a ferrule?

Answer 8

Band that encircles the residual coronal tooth structure

• At least 1mm is required

Question 9

What is the purpose of a ferrule?

Answer 9

• Fracture resistance

- Stress resistance

Question 10

Which molar roots are most likely involved in the use of a post?

Answer 10

MAXILLARY MOLARS
- Palatal roots

MANDIBULAR MOLARS
- Distal roots

Question 11

What are problems associated with posts?

Answer 11

• Perforation
• Core fracture
• Root fracture/ crack
• Post fracture