[Effect of base layer thickness of a self-adhesive resin on dentin bonding strength].

Objective: To evaluate the effect of base layer thickness of DyadFlow(DF) self-adhesive resin on dentin bonding strength.

Methods: Twenty extracted intact human molars were randomly selected and the occlusal surface of each molar was prepared by removing the enamel and exposing the dentin surface. The prepared molars were divided, randomly and equally, into 4 groups.