Obturation Flashcards
why do we need to obturate?
seal from bacteria!
what is the purpose of the lateral seal?
entoumb the bacteria in the dentinal tubules
what are the majority of root canal failures due to?
inadequate obturation
what 4 factors influence the success of root canal treatment?
- peri apical radiolucency
- absence of voids in the root canal filling
- root canal filling within 2 mm of the apex
- adequate coronal restoration
where are voids most critical?
coronal and apical region. they will provide space for bacterial growth
how far from radiographic apex should you aim?
aim for 1 mm from the radiographic apex
where should you obturate the material to?
the final CEJ or the canal orifice
what is gutta percha made of?
since oxide, gutta percha, radioopacifiers, and wax and resins
what phase of the gutta percha is firm and compatible?
beta. when you heat it, it changes to the alpha phase.
what is in ZOE?
zinc oxide, resin, bismtuh carbona, barium sulfate, eugenol
if you get to a size 45 or 5o, what does this mean?
that’s bad because you have no apical stop! have to be careful with the obturation so that you don’t go past the working length
how do you “dry fill”
take your your master apical file to working length and give 1/4 turn an diwthdraw. remove any debris form the canal and then do this until you get a clean file
why should the canal be well when checking tug back?
because you don’t want “false” tugback
orifices of canals are equidistant and perpendicular from a line draw ___ through the center of the pulp chamber floor?
MD line through the center of the pulp chamber floor
