Method: thirteen commercial brands of composite resins were selected, all A2 shade; G1 Filtek™ Z350, G2 TPH®3, G3 Tetric®NCeram, G4 Amelogen® Plus EN, G5 ice, G6 Filtek™ Z100, G7 Brilliant Enamel, G8 Point 4™, G9 Premisa™, G10 Grandio®, G11 Amelogen® Plus D, G12 Solare, G13 Kalore. Sixteen standardized discs (10 mm diameter and 2 mm thick) were prepared for each group. They were randomly divided into four subgroups, according to polishing system: J Jiffy®, SS Super Snap®, AA Astropol® /Astrobrush® and SL Sof-lexTM. Samples were stored in distilled water for 24h at 37°C and the thickness was determined by means of a digital micrometer. They were then polished for 10 seconds with each grain using wáter cooling. Thickness was re-meassured and the difference between initial and final Reading was registered for statistical analysis. We aplied a univariate ANOVA (L) for C and F factors and Scheffe test from the SPSS 19.0 ®. P value was established at 0,05.
Result: L level C p=0,000 with significant differences. Homogeneous groups, mean (mm) and standard deviation were: G5:0,036(0,02)= G2:0,034(0,02)≥ G4:0,03(0,02)= G3:0,026(0,02)= G7:0,022(0,013)= G10:0,021(0,023)= G8:0,02(0,013)= G11:0,019(0,009)= G1:0,019(0,014)= G12:0,018(0,014)= G6:0,014(0,009)≥ G13:0,012(0,006)= G9:0,011(0,011). L level F p=0,000 with significant differences. Homogeneous groups, mean (mm) and standard deviation were: AA:0,27(0,002)= SS:0,25(0,002)= J:0,23(0,002)> SL:0,01(0,002). C - F interaction was p=0,000 with significant differences.
Conclusion: based on the findings of this in vitro investigation, Sof-lexTM produced significantly lower wear tan the other systems evaluated. However, it must be remarked that this response depends on the composite resin evaluated.