The study compares the surface topography of two composite resins with different sizes of their mineral particles, when finished by two various methods. Two different composite resins: Filtek Z250, (3M ESPE) and Charisma (Heraeus Kulzer) were used in the study. From each material, 18 cylindrical samples, 5 mm inn diameter and 5 mm high, were prepared. Prior to the polymerization of the last layer, a polyester matrix was applied on the sample surfaces. Each control group was made up of 6 samples from the two types of non-finished composite resins. 6 samples were finished with Sof-Lex (3M ESPE Dental Products) disks, while other 6 were processed by a system of gums with the diamond powder Po-Go (Dentsply DeTrey). The samples were all analyzed by atomic force microscopy. Surface rugosity was calculated, the results being expressed as values of quadratic rugosity. The non-finished surfaces, in contact with the matrix, of both composite resins were smoother than the finished ones. An increasing tendency to surface rugosity of both hybrid and microhybrid composite resin was observed after finishing with both systems. The Po-Go system gave smoother surfaces after finishing, comparatively with the Sof Lex system. From the view point of surface rugosity, the best results were recorded for the microhybrid composite resin, in association with the Po-Go system.
Keywords:- acid solutions
- AFM
- composite resins