[Dentinal bonding systems and the tensile bond strength test]

The aim of the present study was to evaluate the tensile bond strength of four dentinal bonding agents (DBAs) to the dentin surface. Tensile bond test procedure was made using a universal testing machine. Human extracted third molars were mounted with self-curing acrylic resin in cylindrical molds. The dentin occlusal surface was ground with 320-grit silicon carbide abrasive paper. The DBAs were prepared according to manufacturers' directions and applied on the dentin surface. Cylindrical teflon tubes were placed on the dentin surface and filled with a microfilled resin. The samples were then stored in a humidifier at 37 degrees C for 24 h. Six specimens were prepared for each group. A statistically significant difference was observed among the four groups. It has been observed that certain materials showed a dentin bond value superior to cohesive value of composite resin.