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 protected]
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
