[Study of composite resin adhesion]

The adhesive resistance of the bonding between a same light-cured composite, was determined "in vitro" by a tensile stress test. The bondings were performed among two parts of same composite with and without resin-bonding agent. The variable used was the application or not of the resin bonding agent for enamel and dentin, over the adhering surface of the matrix, obtaining resistance values of 28-30%, compared with the cohesive resistance of the material used, when the resin bonding was utilized. On the other hand, using a composite without the resin bonding agent, the tensile stress resistance values decreased below 10% of the total cohesive resistance informed by the manufacturer.