A composite resin (Admira, VOCO, Cuxhaven, Germany), a RMGIC (Fuji II ® LC, GC, Alsip, IL, USA), and a compomer (Dyract ® , Dentsply/De Trey, Konstanz, Germany) currently indicated for esthetic anterior restorations were used in the present study. Information regarding material type, composition, and manufacturer is given in Table 1. Forty samples were prepared for each group (n=120). The samples were prepared in a cylindrical brass mold that had a diameter of 10 mm and a depth of 2 mm. After the materials were placed into the mold, a transparent polyester strip (Mylar, DuPont, Wilmington, DE, USA) was placed on the materials. Slight pressure was applied to obtain a smooth surface and to remove excess material. The materials were manipulated and polymerized according to the manufacturers' instructions. All specimens were polymerized by an LED light-curing unit (T-LED, Elca Technology, Imola, Italy) with a light intensity of 1,100 mW/cm 2 , using 20 s of exposure to the top and bottom surfaces.
Specimens were wet-ground with 1,000-grit silicon carbide abrasive paper for 10 s for the purpose of surface standardization.
Upon completion of the sample preparation, the samples were randomly divided into four subgroups according to different finishing and polishing systems (n=10).
Specimens were wet-ground with 1,000-grit silicon carbide abrasive paper for 10 s for the purpose of surface standardization.
Upon completion of the sample preparation, the samples were randomly divided into four subgroups according to different finishing and polishing systems (n=10).