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 on enamel microhardness of two consumer-available bleaching solutions when compared with a dentist-prescribed, home-applied bleaching solution and a control.
BACKGROUND There exists limited data in the literature regarding the efficacy and safety of consumer-available , paint-on bleaching solutions . PURPOSE The purpose of this in vitro study was to evaluate the effect of two consumer-available , paint-on bleaching products on enamel microhardness against a control and a dentist-prescribed , home-applied ( DPHA ) bleaching product . MATERIAL S AND METHODS Eighty enamel slabs were obtained from extracted human teeth and r and omly divided into four treatment groups : ( 1 ) control ; ( 2 ) Opalescence ( Ultradent Products , Inc. , South Jordan , UT , USA ) ; ( 3 ) Crest Night Effects ( Procter & Gamble , Cincinnati , OH , USA ) ; and ( 4 ) Colgate Simply White Night ( Colgate-Palmolive Co. , Piscataway , NJ , USA ) . Opalescence is a carbamide peroxide DPHA product , whereas Crest Night Effects and Colgate Simply White Night are consumer-available products . The specimens in groups 2 to 4 underwent 2 weeks of treatment for 8 h/d . Specimens were maintained in artificial saliva at 37 degrees C between treatments . Subsequently , one-half of the specimens in groups 2 to 4 ( n=10 ) underwent an additional seven treatments for 8 h/d , while the other half were stored in artificial saliva , receiving no further treatment . Microhardness was measured as Knoop hardness numbers ( KHNs ) at baseline and after 1 , 7 , 14 , and 21 treatment days . The results were analyzed for statistical significance both intra- and intergroups using analysis of variance ( p=.05 ) . RESULTS A statistically significant reduction in mean KHN was observed compared with baseline at 1 , 7 , 14 , and 21 treatment days for group 4 and at 7 treatment days for group 3 . When compared with the control or DPHA product , group 4 was the only treatment that result ed in significantly lower mean KHNs at 7 , 14 , and 21 treatment days . CONCLUSION When evaluating enamel microhardness , consumer available , paint-on bleaching solutions may adversely affect enamel microhardness compared to a control and 10 % carbamide peroxide DPHA bleaching solution . CLINICAL SIGNIFICANCE With numerous consumer-available bleaching products on the market , it is crucial to be judicious in their selection and use . The results of this in vitro study showed that the consumer-available , paint-on bleaching solutions adversely affected enamel microhardness at some time during the study . Consumers should be made aware of this effect on enamel
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 .