Surface roughness of microparticulated and nanoparticulated composites after finishing and polishing procedures

Objective: To evaluated the surface roughness of one microparticulate resin composite Durafill (Heraeus Kulzer Weihrheim, Germany) andfour nanoparticulate resins 4 Seasons (Ivoclar Vivadent, Schaan, Liechtenstein) Esthet x (Dentsply, Milford, DE, USA), Point 4 and Supreme (3M-ESPE, Dental Products,St. Paul, MN, USA). Methods: After finishing with a diamond bur point (F), and polishing with silicone points of gray, green and pink color Politipit (Ivoclar Vivadent,Schaan, Liechtenstein), four stages of completion were performed, simulating one of finishing and three of polishing a resin restoration. Ten samples of each composite resin were measured for surface roughness with surface profilometer (Mitutoyo Corporation, Tokyo, Japan) after each of finishing and polishing sequence.Results: The results showed that nanoparticulate and microparticulate resins presented a significant difference in the surface roughness values, in all finishing and polishing steps. Conclusion: Of the the nanoparticulate resins 4 Seasons (Ivoclar Vivadent, Schaan, Liechtenstein), Point 4 (Kerr CO, Orange, CA, USA), and also microparticulate Durafill (Heraeus Kulzer Weihrheim, Germany) presented significantly lower surface roughness values after completing all the finishing and polishing stages.