Effect of different finishing and polishing systems on surface roughness and surface microhardness of microhybrid, nanohybrid and nanofilled composites- An in vitro study

• Author Details:   
• Jyoti Tyagi ^*
• Sonali Taneja
• Avinash Patil

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Aim: The impact of different polishing and finishing techniques. (EVE Diacomp Plus Twist and Optrapol NG) on surface roughness and surface microhardness of various composites (Mani Micro, Endure Nano, Filtek Z350 XT).
Materials and Methods: A total of 96 discs of 3 different composites was prepared using standardized dimension custom made stainless steel cylindrical mold (diameter 10mm, thickness 2mm). The specimens were divided into three main groups with 32 specimens in each group according to the type of composites Group I (n=32) Mani Micro (MANI INC, Tochigi Japan), Group II (n=32) Endure Nano (SEPTODONT, saint Maur des Fosses France), Group III (n=32) Filtek Z350 XT (3M ESPE USA). Quantitative assessment of surface roughness was done using surface roughness profilometer SJ-201, MITUYOTO JAPAN. Vicker’s hardness test was performed for assessment of surface micohardness. All the discs (n=16) from each group were subjected to finishing and polishing procedure using EVE Diacomp Plus Twist (Ivoclar Vivadent AG, Schaan, Liechtenstein) and Optrapol NG (Ivoclar Vivadent AG, Schaan, Liechtenstein according to the manufacturer’s instructions.
Results: Filtek Z350xt universal (Nanofilled composite) exhibits lowest surface roughness and highest surface microhardness with both the polishing systems (EVE Diacomp Plus Twist and Optrapol NG).
Conclusion: Finishing and polishing techniques significantly effects the surface roughness and surface microhardness of composite restorations.

Keywords: Nanocomposites, Surface roughness, Surface microharness, Contact stylus profilometry, Finishing and polishing