de Arruda, A. M. [UNESP]Santos, Paulo Henrique dos [UNESP]Sundfeld, Renato Herman [UNESP]Berger, S. B.Briso, André Luiz Fraga [UNESP]2014-05-202014-05-202012-09-01Operative Dentistry. Indianapolis: Operative Dentistry Inc, v. 37, n. 5, p. 518-525, 2012.0361-7734http://hdl.handle.net/11449/40399This study evaluated the microhardness and histomorphology of bovine enamel when 35% hydrogen peroxide is used. A total of 44 specimens were adapted to removable devices used by 11 individuals subjected to dental caries challenge. A decrease in microhardness was observed for all groups after the cariogenic challenge. Microscopic analysis revealed that fragments subjected to cariogenic challenge associated with bleaching had more intense superficial histologic changes, but the depth of the lesions remained unchanged. It was concluded that 35% hydrogen peroxide enhanced the reduction in hardness and histomorpho-logic changes in the enamel surface exposed to cariogenic challenge.518-525engArtigo10.2341/11-112-LWOS:000311768400011Acesso restrito0493479801083622969334867147301157619564672347020000-0002-4100-5153