Esberard, RobertaEsberard, Renata R.Esberard, Roberto M.Consolaro, AlbertoPameijer, Cornelis H.2014-05-202014-05-202007-08-01American Journal of Dentistry. Weston: Mosher & Linder, Inc., v. 20, n. 4, p. 245-249, 2007.0894-8275http://hdl.handle.net/11449/38585Purpose: To evaluate the effect of various bleaching agents on the cemento-enamel junction (CEJ) of human teeth by scanning electron microscopy (SEM) analysis. Methods: 30 intact teeth were selected and longitudinally sectioned, yielding 60 specimens. Thirty specimens served as controls; the other 30 were divided into six groups with five specimens each (n= 5) and bleached according to six protocols (Group 1: External bleaching with 10% carbamide peroxide; Group 2: External bleaching with 35% hydrogen peroxide; Group 3: External bleaching with 35% hydrogen peroxide; Group 4: Internal/external bleaching with 35% hydrogen peroxide; Group 5: Internal/external bleaching with 35% hydrogen peroxide; and Group 6: Intracoronal bleaching with a paste of sodium perborate mixed with 9% hydrogen peroxide). After treatment the specimens were prepared and examined in a scanning electron microscope. Results: the bleaching agents used in this study caused morphological changes in the CEJ and increased dentin exposure.245-249engArtigoWOS:000249311100010Acesso restrito