title: Surface Roughness, Microhardness, and Microleakage of a Silorane-Based Composite Resin after Immediate or Delayed Finishing/Polishing.
abstract: Objective. This study evaluated the effect of immediate or delayed finishing/polishing using different systems on the surface roughness, hardness, and microleakage of a silorane-based composite. Material and Methods. Specimens were made with silorane-based composite (Filtek P90, 3M ESPE) and assigned to the treatments: control (light-cured); aluminum oxide discs (Sof-Lex, 3M ESPE); diamond-impregnated silicone tips (Astropol, Ivoclar Vivadent); aluminum oxide-impregnated silicone tips (Enhance, Dentsply). Half of the specimens were finished/polished immediately and the rest after 7 days. Surface roughness (Ra, μm; n = 20) and Vickers microhardness (50 g; 45 s; n = 10) were measured. Cavities were prepared in bovine incisors and filled with Filtek P90. The fillings received immediate or delayed finishing/polishing (n = 10) and were subjected to dye penetration test (0.5% basic fuchsin, 24 h). Data were analyzed by ANOVA and Scheffe, Kruskal-Wallis, and Mann-Whitney tests (p < 0.05). Results. The finishing/polishing system significantly influenced roughness and microhardness (p < 0.0001). For enamel, microleakage was not affected by the finishing/polishing system (p = 0.309). For dentin, Sof-Lex discs and Astropol points promoted greater microleakage than Enhance points (p = 0.033). Conclusion. Considering roughness, microhardness, and microleakage together, immediate finishing/polishing of a silorane-based composite using aluminum oxide discs may be recommended.
authors.affiliation: Department of Restorative Dentistry, School of Dentistry, Federal University of Minas Gerais, Avenida Antônio Carlos 6627, Pampulha, 31270-901 Belo Horizonte, MG, Brazil.
authors.forename: Fernanda Carvalho Rezende
authors.initials: FC
authors.lastname: Lins
authors.affiliation: Department of Social and Preventive Dentistry, School of Dentistry, Federal University of Minas Gerais, Avenida Antônio Carlos 6627, Pampulha, 31270-901 Belo Horizonte, MG, Brazil.
authors.forename: Raquel Conceição
authors.initials: RC
authors.lastname: Ferreira
authors.affiliation: Department of Restorative Dentistry, School of Dentistry, Federal University of Minas Gerais, Avenida Antônio Carlos 6627, Pampulha, 31270-901 Belo Horizonte, MG, Brazil.
authors.forename: Rodrigo Richard
authors.initials: RR
authors.lastname: Silveira
authors.affiliation: Department of Restorative Dentistry, School of Dentistry, Federal University of Minas Gerais, Avenida Antônio Carlos 6627, Pampulha, 31270-901 Belo Horizonte, MG, Brazil.
authors.forename: Carolina Nemésio Barros
authors.initials: CN
authors.lastname: Pereira
authors.affiliation: Department of Restorative Dentistry, School of Dentistry, Federal University of Minas Gerais, Avenida Antônio Carlos 6627, Pampulha, 31270-901 Belo Horizonte, MG, Brazil.
authors.forename: Allyson Nogueira
authors.initials: AN
authors.lastname: Moreira
authors.affiliation: Department of Restorative Dentistry, School of Dentistry, Federal University of Minas Gerais, Avenida Antônio Carlos 6627, Pampulha, 31270-901 Belo Horizonte, MG, Brazil.
authors.forename: Claudia Silami
authors.initials: CS
authors.lastname: Magalhães