seating fixed restorations Flashcards
most commonly encountered issues when seating crowns
occlusal and contact problems
crown fits the model but not the mouth?
model was wrong or mouth has changed
what could make the model wrong
bad impression
distorted impression
improper pouring up
what could make the mouth change
provisional has been off for a while
supra eruption of prepped tooth/opposing tooth
mesial drift
advantages of the uncut cast
doesn’t allow for die to move
does not get the wear that a die does
more similar to the actual interproximal relationship of teeth
disadvantages of the uncut cast
requires a second pour
requires extra trimming to eliminate soft tissue interferences
will not compensate for inaccurate impression (same issue as master cast shit tho)
what to do before you try on a crown
clean all the cement off, use a prep cleaning agent or pumice only prophy paste
should you use flavored prophy paste to clean a tooth off before seating a crown
no
what adjustments can be done before the patient arrices
preliminary inter proximal using UNCUT cast
if a crown rocks, what does that usually mean
interproximal problems
what bur should you use to adjust alloy surfaces
carbide only (no diamond)
what should use use to adjust porcelain and zirconia
NOT carbide
margin is open but interproximals are ok….what to check?
check interior of crown for interference
what material should you avoid when checking interior interferences
occlude (green stuff)
use fit checker instead
what types of crowns should you NOT do internal adjustments to
porcelain, ceramic or zirconia
you will need to remake them
order of adjustments
IP contacts then margins then occlusal adjustment
how to use shimstock
use hemostats and check where it should be tight when the bite before seating the crown
then put the crown on and do the same thing and then use your brain
should you ask the patient to grind their teeth when using articulating paper
no just tap bc you want to adjust to the patients usual bite initially
what can you put on the crown to make articulating paper marks show up better
copalite randomly
should you seat the crown with a ton of force like biting on shit
no just use finger pressure
when is the best time to check for seating errors
right after you seat it, place cotton roll in between opposing teeth and crown and have patient bite. check quickly with shim stock, dont wait until cement has set
do you need to use those little wood stick things
not usually
