Shear bond strength and microleakage of dentin bonding systems

This study evaluated the shear bond strength and microleakage of class V non-retentive restorations with 10 different dentin bonding systems. Some were tested with different composite resins. For the shear bond test, eight specimens were prepared for each product and tested in a universal testing machine. For the microleakage test, 158 V-shaped class V cavities extending to the cementoenamel junction were prepared, coated with a dentin bonding system, and restored with a composite resin. After 250 thermocycles, the teeth were immersed in a dye solution for 48 hours, longitudinally sectioned, and evaluated for microleakage. Both test procedures resulted in significant differences between the various materials. The bond strength failed to completely prevent microleakage at the dentinal wall. The new generation of dentin bonding systems offer a significant improvement over previous materials.