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 10% Sodium Ascorbate on Bleached Bovine Enamel Surface Morphology and Microhardness
Sodium ascorbate has recently been suggested to compensate decreased bond strength of composite resin to bleached tooth surfaces . The aim of present study was to evaluate the effect of 10 % sodium ascorbate on bleached bovine enamel morphology and microhardness considering the possibility of its effect on enamel surface characteristics . A total of 69 bovine enamel slabs were prepared and mounted in acrylic resin . Subsequent to polishing , they were r and omly divided into 3 groups of 23 specimens each ; 3 for Scanning Electron Microscopy ( SEM ) analysis and 20 for hardness test . In group 1 the specimens were immersed in distilled water as control group ; in group 2 the specimens were bleached with 35 % carbamide peroxide for 30 min a week for 3 consecutive weeks ; and in group 3 the specimens were exposed to 10 % sodium ascorbate for 30 min subsequent to bleaching similar to group 1 . After 3 weeks Vickers hardness of the specimens was measured at 3 points with equal distances from each other under a force of 50 g. The mean of the hardness values of each specimen was calculated and data was analyzed by one-way ANOVA ( P < 0.05 ) . The highest and lowest microhardness values were observed in group 1 and group 2 , respectively . However , there were no statistically significant differences in microhardness between the groups ( P = 0.12 ) . The use of 35 % carbamide peroxide alone or with 10 % sodium ascorbate does not affect bovine enamel hardness . SEM analysis showed a network of sodium ascorbate adsorbed to the bleached enamel surface
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 .