Post Cores Flashcards
how do we clinically assess teeth that have previously been RCT
coronal seal/ leakage
remaining tooth structure - ferrule
swelling/ sinus/ TTP
what should we assess radiographically when examining a previous RCT tooth
root filling and shape
bone support
pathology
if a tooth has been RCT but has been unrestored for three months or longer, what should occur
re-root treat
when is a direct post indicated
when there is a ferrule present
when is cast post and cores indicated
when there is no ferrule
what is the advantages of using post/core
gains intraradicular support for definitive restoration
core provides retention for crown
post retains the core
what is a post
placed in the root canal
what is a core
what the prosthesis is cemented on to
how much root filling should be left apically when using a post
4-5mm
how wide should a post be
no more than 1/3 of root width
how much remaining circumferential coronal dentine needs to be left for a post to be placed
1mm
how much of the post should be into the root portion of the tooth
at last half the post length
what is a ferrule
at least 1.5mm height and width of remaining coronal dentine
what is the function of a ferrule
prevents tooth fracture
name three ideal properties of a post
parallel sided - avoids wedging
non-threaded - passive
cement retained
