الفهرس 
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Abstract
This in vitro study was performed to evaluate the effect of different bleaching protocols on two ceramic materials regarding the color and surface roughness. Two types of ceramic materials were used in the study: Zirconia reinforced lithium silicate (Celtra®Duo) and polymer infiltrated ceramic (VITA ENAMIC®).
A total of 56 discs, 28 discs of each material were prepared (thickness 1.2 mm), each group was further subdivided into 3 subgroups (7 samples in each group) according to the bleaching protocol (control, Hydrogen peroxide, carbamide peroxide, laser).
Optical profilometer was used to assess surface roughness, spectrophotometer was used to assess color change, all data were collected, tabulated, and subjected to statistical analysis.
It was found that:
- All tested ceramics (VITA ENAMIC®, Celtra®Duo) exhibited appreciable changes in color except Celtra®Duo bleached with laser exhibited a noticeable color change.
- The surface roughness (Ra) was not shown to vary significantly as affected by bleaching.
Conclusions
Within the limitation of this study, it was concluded that:
- All tested ceramics (VITA ENAMIC®, Celtra®Duo) exhibited appreciable changes in color except Celtra®Duo bleached with laser exhibited a noticeable color change.
- The surface roughness (Ra) was not shown to vary significantly as affected by bleaching.
Recommendation
- Ceramic restorations should be protected during bleaching to avoid color change
- Further ongoing in vitro studies together with clinical researches are recommended to examine the possibility of using bleaching in whitening of the ceramic restorations without affecting surface properties.