Effect of Surface Polishing systems on Color Stability and Surface roughness of Nano-Composite Resin Materials

MastersPurpose: The aim of the study was to compare the effect of different polishing systems on color stability and surface roughness of different Nano-filled resin composite compared to one microhybrid resin composite restorations and to correlate between both characteristics. Materials and Methods: The resin composites tested were Filtek Supreme XT (nanofilled), Tetric EvoCeram (nanohybrid), and Z250 (microhybrid). A total of 45 discs (2 x 10mm) were fabricated (15 specimens from each tested resin composite). Top & bottom surfaces of each disc were subjected to wet finishing using 600-grit silicon carbide abrasive paper. Top surface only was polished with one of the three systems tested (n=5): PoGo, Astropol, and Hi-shine according to the manufacturers’ instructions, while the bottom surfaces served as a control. After storage in distilled water, the average roughness (Ra, μm) of the specimens were measured using (Surtronic 10 Tylor Hobson) profilometer. Color measurements were recorded using Color Eye 7000A Spectrophotometer for baseline. The specimens were immersed in a mixture of an equal amount of staining solutions: coffee, green tea and berry juice, and then were incubated in the dark at 37° for three weeks. Color measurements were recorded again after staining. Analysis of Variance and Tukey multiple comparison tests were used for statistical analysis (p