The contraction stress that occurs during polymerization has received considerable attention. A recommendation for reducing the stress caused by polymerization shrinkage is to activate the resin composite in small increments within the cavity (65), observing the size of the increment to be polymerized (up to 2 mm) and the number of walls with which the resin comes into contact (4). The smaller the number of bonded faces, the greater will be the resin’s capacity to flow and release stress, favouring the resin bond to the tooth (4,65).