Mushtaq Mohammad Bhat
Post Graduate scholar, Department of Conservative Dentistry and Endodontics.
Adil Ahmad
Post Graduate scholar, Department of Prosthodontics and Crown and Bridge.
Malik Sartaj
Senior Resident, Department of Conservative Dentistry and Endodontics.
Abstract
The finishing and polishing in composite resins can be accomplished with finishing burs (carbide & diamond), abrasive discs, abrasive strips and abrasive pastes etc. Surface roughness can be measured up to Nano scale by qualitative methods, such as scanning electron microscopy, or quantitative methods, such as profilometry. The purpose of our study was to evaluate the surface roughness of various Nano-hybrid composite after multi-step polishing systems using scanning electron microscope and profilometry. The nano-hybrid composites used in this study were Tetric Evo Ceram (TET) (Ivoclar Vivadent Schaan, Liechtenstein), Filtek Z250 XT (3M ESPE) and Beautifil II (shofu).The polishing system used were Super Snap (Shofu, Inc, Kyoto, Japan).Polishing procedure involved use of abrasive disk of all four grits in a dry condition, using a planar motion for 30 seconds, using micromotor handpiece speed not exceeding 30,000 rpm. After each polishing step, the specimens were thoroughly rinsed with water for 10s to remove debris, air-dried for 5 seconds, and then polished with another disc of lower grit for the same period of time until final polishing. The surface roughness values of each specimen were then measured by using a profilometer. The average roughness (Ra) of a surface is defined as the average value of the height of the surface profile above and below a centreline throughout a prescribed sampling length. All groups showed variable values of surface roughness after polishing. Variations in values were due to different fillers, sizes and different matrix of composites. Tetric evo ceram with least roughness and Beautifil II showed the maximum roughness. To conclude, all composites exhibit roughness after polishing, the filler technology in composites may show variable results after polishing
Keywords: Ivoclar Vivadent Schaan, Liechtenstein