Surface Roughness of Three Resin Composites Finished and Polished with different Systems

The aim of this study was to evaluate the effect of two different finishing tecniques and two different polishing procedures on the surface roughness of one nano-filled composite (Filtek Supreme XT), one nano-ceramic composite (CeramX) and one nano-hybrid composite (Grandio). 35 disk-shaped specimens (5 mm diameter and 2 mm thickness) were made for each composite resin by using stainless stell mold. Specimens were randomly divided into seven finishing and polishing procedures as follow: Group 1: Mylar strip (as control), Group 2: Diamond finishing burs, Group 3: Diamond finishing burs+Optidisc, Group 4: Diamond finishing burs+Hi-Luster, Group 5: Tungst encarbide burs, Group 6: Tungsten carbide burs+Optidisc, Group 7: Tungsten carbide burs+Hi-Luster. A profilometer device was used to measure the average surface roughness (Ra) of all the specimens. Results were statistically analysed by using Two way ANOVA and Duncan test at p 0.05 significance level. For all groups, Grandio showed the roughest surface among the other composites tested. All composites showed the lowest surface roughness when finished with tungsten carbide bur and polished with OptiDisc.