Microfiltration on two sealing materials used for non vital teeth withening

Summary: Internal dental whitening is a procedure to improve patient´s aestethetic through removalof crown surface stains. External cervical resorption is one of the main disadventages andconsequence of dental withening. This pilot study looked for a possible communication between thepulpar camera and the root surface by measuring microfiltration of the bleaching agent among twoendodontic sealing materials. 16 single rooted premolars were studied using standard andconventional endodontic treatment. There was tree experimental groups. Group 1 was a 4 teeth sealed2 with glass ionomer and the rest (2 teeth) with fluid resin. Group 2 contained 6 teeth sealedinmediately after endodontic treatment, 3 with fluid resin and the rest with galls ionomer. Group 3was composed by 6 teeth sealed one week after endodontic treatment sealed 3 with fluid resin ansanother 3 with glass ionomer. Teeth groups 2 and 3 were exposed to internal bleaching with sodiumperborate and 30% hydrogen peroxide all teeth specimens were stained with methylene blue and afterembebed under epoxic resin and cotted with microtome and analised under the stereoscophicmicroscope. The conclusion, all teeth showed dye percolation of the bleachy agent towards the root,with one tooth exception sealend with glass ionomer belong to the group in wich the procedure wasperformed one week after endodontic treatment. Key words: Internal whitening. Hydrogene peroxide.Internal root resorption.