The adhesive bonding of a fast-setting system consisting of three different monomers to etched human enamel surfaces was investigated. Combinations of MMA, methacrylic acid, and adducts of glycidyl methacrylate and p-substituted phenols have been employed. Best results were obtained with hydrogen or t-butyl-substituted phenols. It is shown that a well-chosen three-component system has the advantage of a very low initial viscosity and fast setup times over two-component systems. Various compositions of three-component systems were studied. The maximum bond strength between enamel surfaces and the polymer was 80 kg/cm2. Setup times as well as in vivo setup times are reported.