SDEO Posts Flashcards
Consequences of endodontic tx tooth
Loss of proprioception - reduced by 30%
Function of a post
Fitted into prepped RC
Retains the core
You have a cavity with:
Minimal access cavity
4 intact walls
Do you require a post?
No
You have a cavity with:
Loss of 1 wall
MO/DO cavity
Do you require a post?
No
You have a cavity with:
Loss of 2 walls
MO/DO cavity
Do you require a post?
No
You have a cavity with:
Loss of 3 walls
Do you require a post?
Yes
You have a cavity with:
No walls remaining
Do you require a post?
Yes
Ideal ferrule mm
2-3mm
Minimum ferrule
1.5mm coronal dentine
Function of ferrule
Prevents root fracture
Name 3 forces that may cause root fractures
- Functional lever forces
- Lateral forces during post insertion
- Wedging effect of tapered posts
List the optimal post dimensions
1:1 crown: post ratio
Least 1/2 of post in root
1.5mm ferrule minimum
4-5mm GP present
No more than 3rd width at narrowest point
Placed in straight portion of canal
Name the different types of posts
Prefabricated (metal)
Custom made (direct or indirect)
Examples of post materials
SS
Titanium
Co/Cr
Gold
Ceramic (aluminia/zirconia)
Fibre (glass/carbon)
What are the features of an ideal post
Parallel (avoids wedging)
Non threaded (avoids stress)
Cement retained (buffer to dissipate masticatory forces)
