Color Change of Two Different Nano-Hybrid Resin C?m??site Materials after Staining and Bleaching. (An in vitro Study)

Abstract

?ur??se: To investigate the effects of staining and bleaching on color change of two different Nano-Hybrid
resin c?m??site materials.
Materials and Method: In total, 48 samples were fabricated (24 samples from each Nanotype). Samples of
each c?m??site group were sub-divided into three sub-groups (n=8). Samples of Stain sub-groups immersed
in coffee solution for 48 hours at 37°C; in Stain Bleach sub-groups, samples were stored in coffee solution
for 48 hours at 37°C then bleached with 30%H2O2; in Bleach sub-groups, samples were bleached with 30%
H2O2. After that, color measurements were recorded again for each sub-group.
Results: After staining and bleaching, all sub-groups of both tested materials demonstrated clinically
acceptable color change (?E<3.3) with significant differences (?<0.05).
Conclusion: Color change of the two tested materials do not affected by staining and bleaching