A, The hydrophilization of addition silicones is gained with the incorporation of nonionic surfactants shown as micelles. These molecules consist of a hydrophilic part and a siliconecompatible hydrophobic part. The mode of action of these surfactants is thought to be a diffusion-controlled transfer of surfactant molecules from the polyvinylsiloxane into the aqueous phase, as shown. In this manner, the surface tension of the surrounding liquid is altered. B, This increased wettability allows the addition silicone to spread more freely along the surface. PVS, Polyvinylsiloxane.