Tetric PowerFlow Refill 20 x 0.2g IVA20 x . 2gm Pk IVA PowerFlow Cavifil Tetric Refill Tetric? PowerFlow is a flowable, light curing radiopaque composite for the direct restorative treatment in posterior teeth. As its opacity increases during polymerization, Tetric PowerFlow is also suitable for discoloured tooth structure. It is applied as initial layer in increments of up to 4 mm in Class I and II restorations. Tetric PowerFlow cures with light in the wavelength range of 400? 500 nm.