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 .
In Vitro Comparative Study of Two Different Bleaching Agents on Micro-hardness Dental Enamel.
OBJECTIVE To evaluate the effect of home-use bleaching agent containing 16 % Carbamide Peroxide ( CP ) and in-office bleaching agent containing 38 % Hydrogen Peroxide ( HP ) on enamel micro-hardness . STUDY DESIGN An in vitroexperimental study . PLACE AND DURATION OF STUDY Department of Operative Dentistry and Science of Dental Material s at Dr. Ishrat-ul-Ebad Khan Institute of Oral Health Sciences , Dow University of Health Sciences and Material Engineering Department of NED University of Engineering and Technology , Karachi , from July to December 2014 . METHODOLOGY Atotal of 90 enamel slabs from 45 sound human 3rd molar were r and omly divided into 3 groups . Each group contained 30 specimens ( n=30 ) . Group 1 was kept in artificial saliva at 37 ° C in incubator during the whole experiment . However , Groups 2 and 3 were treated with power whitening gel and tooth whitening pen respectively . After bleaching session , specimens were thoroughly rinsed with deionized water again for 10 seconds and then stored in artificial saliva at 37 ° C in incubator . Artificial saliva was changed after every 2 days . The Vickers hardness tester ( Wolpert 402 MVD , Germany ) was adjusted to a load of 0.1 kg ( 100 gm ) and dwell time of 5 seconds . Three Vickers were performed on each specimen using a hardness tester according to the ISO 6507 - 3:1998 specification . Micro-hardness measurements were performed before and after bleaching at day 1 , 7 and 14 . RESULTS In the control group , the baseline micro-hardness was 181.1 ±9.3 which was reduced after the storage on day 1 , 7 and 14 ( p = 0.104 ) . In Group 2 , baseline micro-hardness was 180.4 ±10.1 which was reduced to 179.79 ±10.0 units after day 1 . Whereas , on day 7 and 14 , the values of micro-hardness were 179.8 ±10 and 179.7 ±10.29 , respectively ( p=0.091 ) . Furthermore , the baseline micro-hardness in Group 3 was 174.0 ±22.9 units which was reduced to 173 ±23 on day 1 , 170 ±30 on day 7 and 173 ±23 on day 14 ( p = 0.256 ) . The statistically insignificant difference was found among micro-hardness values of different bleaching agents ( p = 0.118 ) . CONCLUSION Bleaching with 38 % Hydrogen Peroxide ( HP ) and 16 % Carbamide Peroxide ( CP ) result ed in insignificant effect on surface micro-hardness of 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 .