From: "ahmad tehrani"
To: "ROOTS"
Date: June 12, 2008
Subject: [roots] your request

Hello Dr. Borksman:

I am not sure if this is what you are looking for, since it didn't cause resorption ( thank goodness )
Personally, I have done roughly about 30 cases with the same protocol and never have seen a resorption with sodium
perborate. However I have heard that superoxol, 30% H2O2 and high concentration ( 35% and above ) of sodium carbamide sold
by various companies for in-office whitening has caused root resorption when utilized as internal bleaching.

I have attached a case involving treatment of 2 anterior teeth.#8 received sodium perborate as a walking bleach
to whiten it after the endodontic treatment was completed.

The pictures show complete coverage of the coronal extension of gutta percha with a flowable composite before placing Na
Perborate. hope this helps. - ahmad