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Enamel and dentin are dental substrates simultaneously present in most cavity preparations for bonded restorations. Yet, no study can be found regarding the regional morphology of bonding interfaces present in a same cavity. Self-etching adhesive systems incorporate the smear layer into the formed hybrid layer, and consequently bacteria that might be present. Recently a self-etching system with antibacterial properties provided by the addition of MDPB was introduced in the market, but there is still little research on the interfacial morphology obtained with this material. This study aimed at analyzing the interfacial morphology in different areas of MOD cavities prepared using adhesive systems either with or without MDPB, by means of Scanning Electron Microscopy – SEM. Two single bottle adhesive systems whose morphology is widely described in the literature were used as control groups. Sixteen class II cavities were cut in sound human molars and restores using Z250 resin composite and one of the following adhesive systems, applied strictly according to the manufacturers’ instructions: ABF, Clearfil SE Bond, Single Bond and Prime & Bond NT. After 24-hour storage in distilled water at 37oC, the teeth were sectioned in three directions and prepared for SEM analysis according to the protocol described by Montes et al. (2001). Replicas were also obtained from each specimen using epoxy resin. The interfacial morphology showed differences depending on the observed area, and also on the adhesive system. The presence of MDPB did not alter the interfacial morphology of the bonded interfaces obtained with self-etching adhesive systems. Bonded interfaces in enamel revealed perfect adaptation for all studied materials. Key-words: Adhesion, adhesive systems, SEM, cavity

"Estudo da morfologia da interface de união em diferentes regiões de uma cavidade MOD"