Lec 12 Flashcards
(19 cards)
must destroy bacteria AND their substrate to have successful RCT
TRUE
instrumentation can only accesses what percent of the canal anatomy?
60-70%
what concentration of NaOCl is used
8.3%
-chart every time
NaOCl must remove both organic tissue and biofilm
TRUE
keep needle how many mm from working length?
2 mm
you should BIND the needle tip in the canal
FALSE
never bind the needle
go in and out gently
functions of NaOCl
-kills MO on contact
-destroys and dissolves substrate
-disorganizes biofilm
-dilutes toxins
-disinfects RCS
-lubricates canal
-floats out debris
replace NaOCl how often?
3-5 min
how often should you irrigate
following use of each instrument
what is Dankins solution?
0.25% NaOCl
used for surface disinfection
how much NaOCl is used in a typical case?
10-12 cc
NaOCl must be in contact with canal for how long?
30 minutes in a canal enlarged to #30 or larger
size of patency file
10 file
go 0.5 mm out of apex thru foramen to break vapor lock
use of endo activator
agitates irrigants to improve debridement
-place tip 2 mm from WL for 1 min
-removes biofilm, CaOH, activates NaOCl
-doesnt reduce time required
EDTA does what?
removes the smear layer
17% concentration
used for 1 min
use NaOCl after to stop action
2% CHX can also be used as an irrigant
FALSE
-does not remove biofilm and also forms precipitate
-not necessary
RCS can be sterilized
No it cant
-some MO will remain but will be sealed and killed
what is vapor lock?
when the NaOCl cannot reach the apex
-open with #10 file to patency
what does recapitulate mean?
flood canal system with NaOCl every 3-5 min
-use #10 file to prevent vapor lock and reach apex
