In cavities that present margins limited to coronal enamel, the beveled and etched enamel helps to contain the contraction forces. In Class II cavities that present the cervical margin located apically to the cement/enamel line, in an area with no enamel where the material bond to dentin is weaker, rupture of the bond between the material and cavity wall may occur due to the polymerization shrinkage forces of the resin composite.