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 .
Effects of new formulas of bleaching gel and fluoride application on enamel microhardness: an in vitro study.
This in vitro study evaluated the new formulas of bleaching products and the effect of subsequent applications of fluoride on the hardness of enamel during and after tooth bleaching . The crowns of 60 extracted intact human molars were sectioned longitudinally ; the buccal part was embedded in acrylic resin , the occlusal part was ground flat , exposing enamel and dentin , and then polished . Baseline Knoop microhardness ( KHN ) of enamel was determined . The specimens were then r and omly divided into six groups of 10 specimens , and each group was assigned to a specific 10 % carbamide peroxide ( CP ) bleaching agent . A : Opalescence , B : Opalescence PF ( 3 % potassium nitrate and 0.11 % fluoride ) , C : Nite White Excel 3 ( ACP ) , D : Opalescence + F ( acidulated phosphate fluoride 1.23 % ) , E : Opalescence PF + F , F : Nite White Excel 3 + F. The teeth were bleached for eight hours ; after each procedure , the specimens were stored in artificial saliva at 37 degrees C. Immediately after day 21 of bleaching , the specimens in groups D , E and F received fluoride 1.23 % for five minutes . KHN tests w ere performedbefore ( baseline = control ) , during ( 14 , 21 ) and two weeks ( 35 days ) after the bleaching procedure and were statistically compared using ANOVA/Tukey 's t-test ( alpha < 0.05 ) . The statistical analysis revealed no significant difference among the bleaching material s ( p = 0.123 ) . A significant enamel KHN reduction ( p < 0.001 ) was observed for all bleaching material s , with no difference among them . Two weeks after bleaching , all the groups that received fluoride showed a significant increase in microhardness . For the new bleaching formulas , the enamel was restored to a value similar to baseline
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 .