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Ultrastructural evaluation of enamel after dental bleaching associated with fluoride
Author(s) -
Dominguez John A.,
Bittencourt Bruna,
Michel Milton,
Sabino Nilson,
Gomes João Carlos,
Gomes Osnara M. M.
Publication year - 2012
Publication title -
microscopy research and technique
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.536
H-Index - 118
eISSN - 1097-0029
pISSN - 1059-910X
DOI - 10.1002/jemt.22035
Subject(s) - enamel paint , fluoride , nanoindentation , surface roughness , scanning electron microscope , hydrogen peroxide , materials science , elastic modulus , dental enamel , surface finish , polishing , dentistry , atomic force microscopy , chemistry , composite material , nanotechnology , inorganic chemistry , organic chemistry , medicine
This study evaluated the effects on human enamel after two bleaching procedures: with a fluoridated bleaching agent and with topical fluoride application postbleaching. It used 43 enamel blocks (3 mm 2 ) that were ground flat (600–2,000 grit) and polished with polishing paste (one and one‐fourth). Specimens were randomly divided into three groups according to the bleaching procedure: (1) control group, (2) hydrogen peroxide 35% (HPF) and topical application of fluoride 1.23%, and (3) HP 38% (OP) with fluoride in its composition. Bleaching agents were used according to the manufacturer's instructions. Three methodologies were used: nanoindentation, to observe surface hardness and elastic modulus; atomic force microscopy, to observe surface roughness ( R a − R z ); and scanning electron microscopy, to observe the enamel surface effects. Group OP had a decrease in the elastic modulus after bleaching, which was recovered at 14 days. An increased roughness ( R a ; 32%) was observed on group HPF and had an increased erosion on enamel surface (67%). It was concluded that topical application of fluoride, after using the nonfluoridated whitening agent, increased the roughness values and erosion of enamel. Microsc. Res. Tech. 75:1093–1098, 2012. © 2012 Wiley Periodicals, Inc.