Influence of resin matrix on the rheology, translucency, and curing potential of experimental flowable composites for bulk-fill applications.

Objective: To propose monomer formulations that show an optimal degree of conversion as a function of depth for bulk-fill applications.

Methods: Four resin blends were formulated with methacrylate-based monomers: BisGMA + TEGDMA (control); BisEMA + BisGMA + TEGDMA (BisEMA-based); UDMA + BisGMA + TEGDMA (UDMA-based) and BisEMA + UDMA + BisGMA + TEGDMA (BisEMA + UDMA-based). For each material, a photoinitiating system and silanized filler particles were added.