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 .
Combined Bleaching Technique Using Low and High Hydrogen Peroxide In-Office Bleaching Gel.
OBJECTIVES The aim of this study was to evaluate the efficacy , color stability , risk , and intensity of tooth sensitivity ( TS ) of combined bleaching techniques performed with 20 % or 35 % hydrogen peroxide for an in-office protocol . METHODS Thirty patients were r and omly divided into two groups and su bmi tted to a single 45-minute in-office bleaching session with 35 % hydrogen peroxide or 20 % hydrogen peroxide . At-home bleaching was performed with 10 % carbamide peroxide for two hours daily over the course of two weeks . The color was evaluated with the value-oriented shade guide Vita Classical at different periods up to 12 months after bleaching . Patients recorded the intensity of TS using a five-point verbal scale . Color change data were su bmi tted to a two-way repeated- measures analysis of variance and Tukey test ( α=0.05 ) . The absolute risk and intensity of TS were compared with the Fisher exact test and Mann-Whitney test , respectively ( α=0.05 ) . RESULTS On average , an effective and similar whitening of three units in shade guide was observed for both groups , which remained stable for 12 months . When both protocol s were compared , the one with hydrogen peroxide 35 % showed a higher risk ( p=0.02 ) and intensity of TS ( p=0.04 ) . In regard to the TS intensity , no significant difference was observed up to 48 hours after in-office bleaching ( p=0.09 ) and during the at-home bleaching phase of the study ( p=0.71 ) . CONCLUSION The combined bleaching technique using at-home bleaching associated with in-office bleaching was effective and stable over the course of 12 months , regardless of the concentration of the hydrogen peroxide used for in-office bleaching . However , the protocol with 20 % hydrogen peroxide produced lower risk and intensity of TS
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 .