Evolution du collage en orthodontie : apport des adhésifs automordançants

Over the past few years, a new generation of adhesives has been available to practitioners. In this study, we have investigated their properties, uses and their advantages and drawbacks. Furthermore, we performed an in vitro experiment to test the specific features of the self-etching primers. This laboratory study was performed on forty-eight teeth divided into two groups. The first were fitted with bonded brackets using a self-etching adhesive. The second was fitted with bonded brackets using a conventional phosphoric acid + primer technique. After bonding, the samples were subjected to a shear bond test using a universal test machine. The results showed that: 1) No significant difference was observed between the selfetching adhesive and the conventional technique. 2) The bond fracture location revealed very significant variations from one group to the other with a shift of the bond-failure zone towards the adhesive/bracket interface in the group using the self-etching adhesives. 3) Self-etching adhesives provide excellent bond strength between the composite and the tooth enamel.