Microfiltration on two sealing materials used for non vital teeth withening

Abstract

Summary: Internal dental whitening is a procedure to improve patient´s aestethetic through removal
of crown surface stains. External cervical resorption is one of the main disadventages and
consequence of dental withening. This pilot study looked for a possible communication between the
pulpar camera and the root surface by measuring microfiltration of the bleaching agent among two
endodontic sealing materials. 16 single rooted premolars were studied using standard and
conventional endodontic treatment. There was tree experimental groups. Group 1 was a 4 teeth sealed
2 with glass ionomer and the rest (2 teeth) with fluid resin. Group 2 contained 6 teeth sealed
inmediately after endodontic treatment, 3 with fluid resin and the rest with galls ionomer. Group 3
was composed by 6 teeth sealed one week after endodontic treatment sealed 3 with fluid resin ans
another 3 with glass ionomer. Teeth groups 2 and 3 were exposed to internal bleaching with sodium
perborate and 30% hydrogen peroxide all teeth specimens were stained with methylene blue and after
embebed under epoxic resin and cotted with microtome and analised under the stereoscophic
microscope. 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 was
performed one week after endodontic treatment. Key words: Internal whitening. Hydrogene peroxide.
Internal root resorption.