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 .
The effect of 10% carbamide peroxide bleaching material on microhardness of sound and demineralized enamel and dentin in situ.
This in situ study evaluated the microhardness of sound and demineralized enamel and dentin su bmi tted to treatment with 10 % carbamide peroxide for three weeks . A 10 % carbamide peroxide bleaching agent -- Opalescence/Ultradent (OPA)--was evaluated against a placebo agent ( PLA ) .  Two hundred and forty dental fragments--60 sound enamel fragments ( SE ) , 60 demineralized enamel fragments ( DE ) , 60 sound dentin fragments ( SD ) and 60 demineralized dentin fragments (DD)--were r and omly fixed on the vestibular surface of the first superior molars and second superior premolars of 30 volunteers . The volunteers were divided into two groups that received bleaching or the placebo agent at different sequences and periods at a double blind 2 x 2 crossover study with a wash-out period of two weeks . Microhardness tests were performed on the enamel and dentin surface . The SE and DE su bmi tted to treatment with OPA showed lower microhardness values than the SE and DE su bmi tted to treatment with PLA . There were no statistical differences in microhardness values for SD and DD su bmi tted to the treatment with OPA and PLA . The results suggest that treatment with 10 % carbamide peroxide bleaching material for three weeks alters the enamel microhardness , although it does not seem to alter the dentin 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 .