Direct Post Core systems

Question 0

What are the contraindications for direct posts?

Answer 0

1) Non-restorable tooth
2) Short roots, thin roots, carious roots
3) Bends/ blockages in the root canals
4) Existing root pathology
5) Poor periodontal support
6) If core can be retained and supported without post

Question 1

What are the primary functions of a post?

Answer 1

1) Retain the core
2) Stabilise the core
3) Obturation of the post canal

Question 2

What are the functions of a core?

Answer 2

1) Foundation for a coronal restoration
2) Retention and stabilisation of coronal rstoration
3) Perform as an interim restoration

Question 3

How can post systems be classified?

Answer 3

1) Method of application
2) Shape
3) Material
4) Passive/ Active

Question 4

What conditions should be assessed prior to considering a post?

Answer 4

Tooth ultimately restorable
Remaining tooth structure sound
Periodontal support
Apical seal
No periapical patholoogy
Sufficient root length
good acccess to tooth
Tooth isolation possible

Question 5

what are the burs used for post hole preparation?

Answer 5

GG burs
peeso drills
ParaPost drills

Question 6

How much GP should be left in the canal?

Answer 6

4-5mm. Measure using pre-op radiograph and use rubber stopper on GG appropriately.

Question 7

How are direct post cementeed into the canal?

Answer 7

Use GIC or resin cements. if using a non-alloy post, silane coating may be required.
Post coated with cement, cement placed in canal with lentulo spiral
Seat post and maintain slight positive pressure
Trim away cement when set