Objectives : To evaluate the effect of sonic application of self-etch adhesives at different application times on the micro-shear bond strength of two different types of resin composite to dentin and to assess the effect of such technique of bonding at different storage times. Materials and methods: A total of 120 human molars were ground to expose the occlusal dentin to be used in preparation of 240 specimens. The teeth were divided into two groups according to the method of adhesive application either manual rubbing for 20 seconds (60 specimens) or sonic rubbing (180 specimens). The control group was divided into two subgroups (30 each) according to the type of resin composite. Each subgroup was divided into three classes (10 each) according to the storage period either immediate, one month or three months. While for the sonic group, it was divided into 2 subgroups (90 each) according to the type of the resin composite. Each subgroup was divided into three classes (30 each) according to the sonic rubbing time either 5, 10 or 20 seconds. Each class was divided into three subclasses (10 each) according to the period of storage of the specimens after bonding either immediate, one month or three months. Composite resin micro-cylinder of 1mm diameter and 2 mm height were subjected to micro-shear bond strength testing after the different storage times.Results: no significant difference was found between the sonic and manual rubbing but sonic application of self etch adhesive could be used for 10 seconds to shorten the application time. No significant difference was found between the two different types of resin composite (p ≥ 0.05).significant decrease in bond strength was noticed with increase in the storage time.Conclusion: The micro-shear bond strength of resin composite to dentin is not the role of the resin composite type. Sonic application of self etch adhesive could be used for 10 seconds.Bond strength of resin composite to dentin using self etch adhesive is adversely affected by storage irrespective to the application technique used.