الفهرس 
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Abstract
Objectives : This study was conducted to evaluate and compare the effect of different in-office bleaching techniques on color change and enamel surface micromorphology. Materials and Methods : Three different bleaching agents (one light-activated and two chemical-activated) were selected for this study. Sixty sound human permanent maxillary central incisors were selected and fixed in cylinder plastic mold (2 cm width and 1cm height) fabricated with using self- polymerized acrylic resin. Teeth were assigned into two groups according to the test conducted on, color test group (n=30), and the micro-morphology test group (n=30). Each group was further classified into three subgroups (n=10) according to the bleaching material used. The subgroups of each bleaching material were tested for enamel color change assessment using a spectrophotometer and for surface micromorphology assessment by a non-contact optical profilometer before and after bleaching application. Data for each test was tabulated and statistically analyzed. Results: Regarding color change analysis, all tested bleaching materials were effective on tooth color whitening, there was statistical significant difference in the mean value of all tested groups (P=0.011). With higher mean values recorded for Zoom group followed by Dash and Boost groups. Regarding the results of surface micromorphology, all the tested bleaching materials showed no statistical significant difference in enamel surface roughness after bleaching (P=0.591). Conclusion: All the tested in-office bleaching systems were effectively whiten teeth, with light-activated system exhibited higher whitening potential than chemical-activated bleaching systems, with insignificant change in enamel micromorphology.