Posts Flashcards
1
Q
What is the function of a post?
A
Retains core (DOES NOT strengthen tooth)
2
Q
What clinical considerations must be taken when designing a post?
A
- Remaining coronal tooth
- Root width
- Root length
- Canal shape
3
Q
What types of posts are available?
A
- Prefabricated
- Metal/ fiber
- Parallel/ tapered
- Smooth/ serrated/ threaded
4
Q
When is stress produced on posts?
A
- Cementation
- Masticatory loading
- Post removal
5
Q
What is an ideal post deign?
A
- Parallel sides (avoids wedging)
- Non-threaded (avoids incorporating stress)
- Cement retained (buffer between mast forces, post and tooth)
6
Q
How are posts removed?
A
- Ultrasonic
- Trephan e.g. Masseran
- Eggler device
- Moskito forceps
- Sliding hammer
7
Q
When is a post used for POSTERIOR teeth?
A
- Usually core retention can be obtained physically with undercuts
BUT IF NO CORONAL TISSUE…
- Post inserted into the longest straight canal
8
Q
What is a ferrule?
A
Band that encircles the residual coronal tooth structure
- At least 1mm is required
9
Q
What is the purpose of a ferrule?
A
- Fracture resistance
- Stress resistance
10
Q
Which molar roots are most likely involved in the use of a post?
A
MAXILLARY MOLARS
- Palatal roots
MANDIBULAR MOLARS
- Distal roots
11
Q
What are problems associated with posts?
A
- Perforation
- Core fracture
- Root fracture/ crack
- Post fracture
