The results of this meta- analysis showed no significant changes in enamel microhardness when using the 10 % carbamide peroxide bleaching gel over periods of 7 , 14 and 21 days
Several studies have investigated the effect of bleaching on dental tissues .
The evaluation of the effect of home bleaching with 10 % carbamide peroxide is important for assessing alterations in enamel microhardness that may affect dental health in terms of resistance to masticatory forces .
This meta- analysis was performed in order to determine scientific evidence regarding the effects of home vital bleaching with 10 % carbamide peroxide gel on the microhardness of human dental enamel .
Effect of a carbamide peroxide bleaching gel containing calcium or fluoride on human enamel surface microhardness.
This in vitro study evaluated the surface microhardness of human enamel su bmi tted to bleaching with 10 % carbamide peroxide ( CP ) containing calcium or fluoride . Ninety-eight dental blocks ( 5 x 5 mm2 ) with polished enamel surfaces were r and omly assigned to 7 treatment groups ( n=14 ) , as follows : without bleaching and storage in artificial saliva ( control ) ; 10 % CP ; 10 % CP + 0.05 % calcium ; 10 % CP + 0.1 % calcium ; 10 % CP + 0.2 % calcium ; 10 % CP + 0.2 % fluoride ; and 10 % CP + 0.5 % fluoride . During 14 days , enamel surfaces were daily exposed to a 6-h bleaching regimen followed by storage in artificial saliva .  Surface microhardness was measured before ( baseline ) , during ( 7th day ) , immediately after bleaching ( 14th day ) and 1 week post bleaching . Data were analyzed by two-way ANOVA and Tukey 's test ( p<0.05 ) . All treatments reduced SM significantly during the bleaching cycle ( 7th day ) , immediately after bleaching ( 14th day ) and 1 week post bleaching , compared to baseline and to the unbleached control group . In conclusion , in spite of the addition of calcium and fluoride , all bleaching treatments affected the enamel surface microhardness
The results of this meta- analysis showed no significant changes in enamel microhardness when using the 10 % carbamide peroxide bleaching gel over periods of 7 , 14 and 21 days
Several studies have investigated the effect of bleaching on dental tissues .
The evaluation of the effect of home bleaching with 10 % carbamide peroxide is important for assessing alterations in enamel microhardness that may affect dental health in terms of resistance to masticatory forces .
This meta- analysis was performed in order to determine scientific evidence regarding the effects of home vital bleaching with 10 % carbamide peroxide gel on the microhardness of human dental enamel .