Mixing EDTA & NaOCL experiment
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From: Ahmad Tehrani
Sent: Tuesday, May 02, 2006 6:21 AM
Subject: [roots] Mixing EDTA & NaOCL experiment
I am like a dog with a bone at times.
My schedule changed today and I decided to see for myself what happens
when you mix EDTA and bleach together. Of course his is only a simpleton
exercise, but in a way answered some of the questions lingering in my mind.
First off the mixture had an exothermic reaction that got hot to touch....~145 F.
and dang it, I was so excited that I forgot to take a picture of the
temperature....(( I added little by little more hypo and it took 6cc of NaOCl
to change the color up to the dark red color when I tested the 100% bleach by
itself. So the final solution had 8cc of bleach and only 1cc of EDTA.
the ratio was 8:1 to neutralize the effects of EDTA.
Folks this is what you get from a cheap lab with no corporate sponsors.
but hey I had fun and on the very next patient, found a MB2 in a second molar.
I believe in Karma.....My name is Ahmad.))
Ahmad...this reminds me of a song by Styx...
"Too much time on my hands" - Joey D
That was cool, Ahmad. I did not know about the exothermia.
It makes sense, of course, when you mix an acid, even a
weak one and a base. DougR
I am a visual learner by default. Most of the stuff make
perfect sense to me, when I see it with my own eyes.
Mixing all these different chemicals in the root canal
creates chemical reactions that we not be aware of.
Terry wrote a while back that he never mixes different
chemicals in the root canal because of unknown reactions
that may occur. I think he has a point. - ahmad
Nice experiment Ahmad, thanks for posting! - Marga
One thing must be kept in perspective......are the results
clinically significant in terms of outcome? - Fred
This month's EXCELLENT JOE (May 2006) article -- REVIEW --
by M. Zehnder covers this mixture: NaOCl + EDTA. Actually,
the author does not recommend it, pointing out that the
"bubbling" is actually inactivation of the NaOCl --
if I read it correctly. So, the author rec's NaOCl throughout
instrumentation, then EDTA after all NaOCl is done and
suctioned out (my interpretation). Regardless, this article
is one of the best I have ever read!
5 stars -- a must read. - Enjoy, :) - Judy
Ahmad, I alway thought you were cool. This confims it.
Evidence-based coolness. - : ) Wes