Effect of differe
Effect of different bleaching protocols on surface roughness of human dental enamel and nanofilled resin composite
Ola. M. Sakr
Departments of Operative Dentistry, College of Dentistry, Qassim University (Saudi Arabia) and Misr University for Science and Technology (Egypt). email@example.com
Abstract: Background: Bleaching considered a conservative techniques for treatment of discolored human teeth. Although bleaching is safe to soft tissues from a procedural standpoint, but it may not be safe for dental tissues and materials. The effects of such oxidizing agents on enamel and esthetic restorative material surface roughness, however not been widely studied. Surface roughness of enamel and restorations is one clinical important physical property that warrants investigation. The Aim of the study is to evaluate of the effect different bleaching agents on surface topography of Enamel surface and nanofilled resin composite. Objectives: In this study 30 % carbamide peroxide, 40% hydrogen peroxide and 10% carbamide peroxide bleaching agents were performed on 40 extracted teeth and 40 disc of nanofilled resin composite to evaluate their effects on surfaces roughness of enamel and nanofilled resin composites. Method: The buccal surfaces of forty extracted anterior teeth were flattened as parallel as possible without exposing dentin. Forty Disc shape nanofilled resin composite samples were prepared. The samples were randomly divided into 4 groups: Group A teeth and composite discs were bleached with CP at 30% of 1 application for 30 minutes /application; Group B teeth and composite discs were bleached with HP at 40% for 20 minutes /application and Group C teeth and composite discs were bleached with CP at 10% for 8 hours. Group D: The control group, samples were kept in artificial saliva. Statistical analysis of Data were presented as mean and standard deviation (SD) values. Two-way Analysis of Variance (ANOVA) was used in testing significance for the effect of bleaching, substrate and their interactions on mean Ra. Results: There was no statistically significant difference between mean Ra of the 30% Carbamide peroxide, 40% Hydrogen peroxide and 10% carbamide peroxide bleaching techniques; all showed the statistically significantly highest mean Ra values. Control group showed the statistically significantly lowest mean Ra value. Conclusion:According to the results of this study various bleaching agents promote superficial changes in enamel structure surface and affect topography of nanofilled resin composite.
[Ola. M. Sakr. Effect of different bleaching protocols on surface roughness of human dental enamel and nanofilled resin composite. J Am Sci 2013;9(3):316-321]. (ISSN: 1545-1003).http://www.jofamericanscience.org. 44
Key words: Vital bleaching, carbamide peroxide, hydrogen peroxide, surface roughness, enamel and nanofilled composite. Full Text 44