Surface roughness of resin composites polished with one-step systems

Objectives: This study evaluated the effects of two one-step polishing systems (PoGo, Dentsply and Dimanto, VOCO) on surface roughness of two nanofilled resin-based composite restorative materials before and after the exposure to a cola beverage.

Methods: Twenty (20) cylindrical specimens were prepared from each composite resin material according to manufacturer's instructions. All specimens were tested for surface roughness. The specimens were randomly assigned to 4 groups with 5 specimens per group. All specimens were immersed in cola beverage for 24 hours. All specimens were measured for roughness. The surface roughness of the specimens was measured with a stylus profilometer.

Results: At baseline (Mylar strip); surface roughness (Mean + SD) of material 1 was 0.25 + 0.03 and material 2 was 0.27 + 0.01. There was no statistically significant difference of surface roughness. After polishing with Dimanto; surface roughness of material 1 was 0.08 + 0.01 and after polishing with PoGo surface roughness was 0.05 + 0.01. There was a statistically significant difference of surface roughness. After polishing with Dimanto; surface roughness of material 2 was 0.06 + 0.01 and after polishing with PoGo; surface roughness was 0.033 + 0.01. There was a statistically significant difference (P=0.000) of surface roughness. After staining and polishing with Dimanto; surface roughness of material 1 was 0.08 + 0.02 and after polishing with PoGo; surface roughness was 0.06 + 0.01. There was no statistically significant difference of surface roughness. After staining and polishing with Dimanto; surface roughness of material 2 was 0.05 + 0.01 and after polishing with PoGo; surface roughness was 0.03 + 0.004. There was a statistically significant difference of surface roughness. 

Conclusions: There was significant difference of surface roughness of material 1 and material 2 following polishing with Dimanto and PoGo.