Random Flashcards
Parallel post are more
Retentive and distribute stresse better than tapered posts but do not conform well to shape of canal
A tapered post
Conforms Better to the canal and retailers less removal of dentin to achieve an adequate fit
Use custom made post in canals that
Have a non circular cross section or extreme taper
A cast post should fit
Somewhat loosely in the canal a tight fit may cause root fracture
Posterior teeth are subject to greater loading due to
Their closer proximity to the transverse horizontal axis
Thinner posts
Exert less stress less likely to fracture tooth
Relatively long posts with circular cross section provide good retention and support in
Anterior teeth
Avoid in posterior
Posterior teeth with their elliptical and curved canals get retention better by
Two or more short posts in divergent canals
4 walls
No risk
3 walls distal or mesial missing
Low risk
Buccal lingual walls light lateral
Low risk
Buccal lingual heavy
Medium risk
3 walls buccal or lingual missing light loads
Medium risk
3 walls buccal or lingual missing heavy loads
High risk
