Clinical performance of different bulk‐fill composite resin systems in class II cavities: A 2‐year randomized clinical trial

Objectives This study evaluated the clinical performance of bulk‐fill resin composite systems with different viscosities in class II cavities. Materials and Methods A total of 80 class II restorations were performed with a single operator in 50 patients using four different bulk‐fill resin composite materials: Filtek™ Bulk Fill, Heated Filtek™ Bulk Fill, G‐ænial™ BULK Injectable, and SonicFill3. A double‐blinded randomized clinical trial was designed to evaluate the two‐year clinical performance of the four bulk‐fill composite resins using modified FDI criteria. Data were analyzed descriptively. Level of significance was set at 0.05. Differences between groups were tested using Wilcoxon‐signed‐rank and Mann–Whitney‐U test as nonparametric tests. Results Data were analyzed using Kruskal‐Wallis, Mann–Whitney U, and Wilcoxon signed rank tests (p