disinfection Flashcards
pulpal system anatomy, implication?
very complex anatomy, instruments fail to reach all parts which can allow bac and substrate to persist
to be successful we must remove/destroy:
Remove & Destroy both the Bacteria and their Substrate to be successful*
what % of pulpal anatomy can we access with instruments
We can access only a percentage of the complex anatomy & “protected areas” by any instrumentation. 60-70%
major cleaning solution
8.3%Sodium Hypochlorite
(NaOCl)
major weapons of disinfection
CLEANING AND SHAPING with NaOCl and INTRA CANAL MEDICAMENTS
ADMINISTRATION OF NaOCl:
use of side vented needle to prevent NaOCl from PA/ keeps you 2mm short WL: TIP OF NEEDLE CANNOT GO PAST APICAL CONSTRICTION
must bend the needle
do not allow tip to bnd to canal, in and out gently
NaOCl functions in pulp system
- NaOCl kills micro-organisms on contact
- NaOCl destroys & dissolves substrate
- Disorganizes Biofilm
- Dilutes Toxins in canal system
- Disinfects RC System & Instruments
- Lubricates Canals
- Floats out Debris
where?
NaOCl breaksdown into?
NaCl and H2O, occurs in tooth
NaOCl replenishment
NaOCl becomes inactive after 3-5
min. in the canal so it must be
replenished every 3-5 min.
what must be done after each active instrument
irrigation
TIME and EFFECT of NaOCl on pulpal tissue
our NaOCl vs normal cleaning solution
Dakin’s solution is often used
for surface disinfection. It is
0.25% NaOCl.
8.3% NaOCl (Clorox) is 33.2
times STRONGER and
MORE TOXIC – also more
effective!
cc NaOCl per visit
Typical case requires about 10-12
cc. of NaOCl
as irrigant per visit
how long must NaOCl contact canal? enlarged to what size?
NaOCl must be in contact with shaped canal a minimum of 30 minutes after canal enlarged to #30 or larger.
patency file used for?
breaking vapor lock and ensuring NaOCl reaches apical portion of canal