Sof lex abrasive discs

Finally, the restorations were finished using superfine diamond polishing burs with yellow rings (EF504, Hanzhong Rising, Co., Ltd. Shaanxi, Hanzhong, China) followed by Sof-Lex abrasive discs (3 M Espe, 3 M/ESPE, St. Paul, MN, USA) were used to polish the resin composite build-ups and Kenda polishing kit (Kenda, Liechtenstein, Germany).

Standardized molds with 2-mm thickness and 5-mm internal diameter were utilized to fabricate disc-shape samples from Beautifil Injectable X (BF), G-ænial Universal injectable (GU), and SonicFill 2 (SF) (n=16). The materials were packed in the model between two transparent mylar matrix strips (Universal Strip, DML, Germany) and glass slides then a 500 g weight was applied for 20 seconds. Subsequently, the weight and the glass slide on top were removed then the resin composite cylinders were light cured from the top side only for 10 seconds. The top-side mylar strip was removed, and the material was light cured for another 10 seconds. The cured composite cylinders were carefully pulled out from the mold, and the bottom surface of the specimens was identified with an indelible mark. For the Cerasmart (CS) group, 2-mm slices were sectioned using a precision saw (IsoMet 1000, Buehler, Germany). The top surfaces of all the specimens were polished with Sof-Lex abrasive discs (coarse, medium, fine, superfine; 3M-ESPE Dental Products, St. Paul, Minnesota, United States). Afterward, the specimens were kept in an incubator for 24 hours at 37°C.