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The effect of fluoride therapies on the morphology of bleached human dental enamel
Author(s) -
Ferreira Stella da Silva,
Araújo Jesuína Lamartine Nogueira,
Morhy Omar Neves,
Tapety Celiane Mary Carneiro,
Youssef Michel Nicolau,
Sobral Maria Angela Pita
Publication year - 2011
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.20939
Subject(s) - enamel paint , saliva , hydrogen peroxide , fluoride , dentistry , molar , dental enamel , scanning electron microscope , chemistry , morphology (biology) , nuclear chemistry , materials science , medicine , biology , composite material , biochemistry , inorganic chemistry , genetics
The aim of this in vitro study was to evaluate qualitatively the surface morphology of enamel bleached with 35% hydrogen peroxide (HP) followed by application of fluoridated agents. Forty intact pre molars were randomly distributed into four groups ( n = 10), treated as follows: Group I (control group) remained stored in artificial saliva at 37°C, Group II ‐ 35% HP; Group III ‐ 35% HP + acidulated fluoride (1.23%) and Group IV ‐ 35% HP + neutral fluoride (2%). The experimental groups received three applications of bleaching gel and after the last application all specimens were polished. This procedure was repeated after 7 and 14 days, and during the intervals of applications, the specimens were stored in artificial saliva at 37°C. Scanning electron microscopy (SEM) analysis showed superficial irregularities and porosities to varying degrees in bleached enamel compared to control group. Sample evaluation was made by attributing scores, and data were statistically analyzed using Kruskal–Wallis and Dunn tests ( P < 0.05). SEM qualitative investigation demonstrated that 35% hydrogen peroxide affected human dental enamel morphology, producing porosities, depressions, and superficial irregularities at various degrees. These morphological changes were higher after the application of 1.23% acidulated fluoride gel. Microsc. Res. Tech., 2010. © 2010 Wiley‐Liss, Inc.