Effects of composite viscosity and adhesive curing mode on marginal sealing of restorations

Abstract

Objectives: Evaluate the influence of composite viscosity, adhesive systems curing mode and artificial aging on marginal sealing of composite resin restorations. Methods: 240 cavities were prepared in bovine incisors. Teeth were divided in two groups: GR-GrandioSO (Voco), conventional viscosity and GF-GrandioSO Heavy Flow (Voco), low viscosity. Each group was divided into 6 subgroups: FM-Futura Bond M (Voco), FDCL and FDCC-Futura Bond DC (Voco), light and chemical cured, CS-Clearfil S 3 Bond (Kuraray), CDCL and CDCC-Cleafil DC (Kuraray), light and chemical cured. Half of all specimens were subjected to mechanical (300.000) and thermal cycling (1.000). Marginal gap was measured in an optical microscope. For microleakage, specimens were stained in 50% ammoniacal silver nitrate. Results: For marginal gap mean (μm), significant differences were shown for all factors (p = 0.000).