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From: Ahmad Tehrani To: ROOTS Sent: Monday, May 01, 2006 9:51 PM Subject: [roots] Mixing EDTA & NaOCL experiment

From: Ahmad Tehrani To: ROOTS Sent: Monday, May 01, 2006 9:51 PM 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.

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From: Ahmad Tehrani To: ROOTS Sent: Monday, May 01, 2006 9:51 PM Subject: [roots] Mixing EDTA & NaOCL experiment

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  1. From: Ahmad Tehrani To: ROOTS Sent: Monday, May 01, 2006 9:51 PM 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.))

  2. From: Judy McIntyre To: ROOTS Sent: Wednesday, May 03, 2006 10:00 PM Subject: Re: [roots] Mixing EDTA & NaOCL experiment 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:    (NOT EDTA as I wrote earlier) . 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

  3. From: Doug Rakich To: ROOTS Sent: Tuesday, May 02, 2006 11:51 AM Subject: Re: [roots] Mixing EDTA & NaOCL experiment 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

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