post and corez Flashcards
criteria for post and core candidate teeth
need good apical seal from endo
no sensitivity to pressure
no exudates/fistula
no active inflammation
basically you need good endo if you want to do post and core
what is the minimal acceptable height for ferrule
1 mm
1 mm of ferrule _______ the resistance to fracture vs having no ferrule
doubles
maximum benefit of ferrule height
2 mm +
the greater the ________the better fracture resistance
height of tooth structures above the margin of the crown
minimal acceptable width of ferrule
1 mm
OSU clinic protocol for post and core
remove gutta percha and prepare post space in endo clinic
go back out to floor to cement, build up and temporize
what kind of posts do we use at OSU
pre fab titanium
drill color = post color = size
two types of post systemsp
parallel and tapered
t/f: you can get the canal shape to perfectly match the drill shape with a parallel post system
false
how much gutta percha should remain
4-5 mm
how large should you make the canal
about 2 file sizes larger than final fill
how long is the post space in most teeth
8-10 mm (2/3 of length of canal)
but then add 2+ mm of distance coronal to CEJ to account for ferrule
what end do you modify length of a parallel post from
APICACL END
what cement do you use
relyX luting
options for build up of core
amalgam, composite, paracore
for fiber posts, what clearance do you need from adjacent teeth
1.5-2 mm
what end do you modify length of a tapered post
cut the TOP
how to cut posts to length
diamond disk
how to cement prefab fiber posts
clean tooth with bleach, rinse
rely X unicem (does NOT need adhesive)
apply cement using perio probe (not lentulol)
seat post, twisting slightly with moderate pressure
clean excess
light cure or self cure
is rely X dual cure
yes, 40 seconds for light cure of 5 min for self cure
what is main difference between prefab and indirect P&C
indirect post and core are one piece, takes two appointments since you need an impression of the post space
do you want sharp edges on your post space prep
no
which is more conservative: custom or prefab
custom
