Background: The increasing popularity of dental composites has drawn attention to the importance of moisture and contamination control. Adhesion to dentin has been the subject of debate due to its heterogeneous nature, with much higher organic and water content than enamel. Hence; the present study was conducted for comparing the effect of salivary contamination on the dentin bond strength of two different adhesive systems. Materials & methods: A total of 40 freshly extracted mandibular premolars were included in the present study. With the help of a high-speed hand piece, occlusal surfaces of the teeth were reduced at a depth of 1.5 mm from the cuspal tip. After removal, random division of all the specimens was done into following study groups as follows: Group A: Application of Adper Easy One (3M ESPE) to dentin surface followed by light curing, Group B: Application of Adper Easy One (3M ESPE), saliva application, air dried followed by light curing, Group C: Application of Xeno V (Dentsply) to dentin surface followed by light curing, and Group D: Application of Xeno V (Dentsply) saliva application, air dried followed by light curing. Universal force testing machine was used for assessing the shear bond strength. Results: Mean shear bond strength among specimens of Group A and group C was found to be 8.66 MPa and 6.83 MPa respectively. Mean shear bond strength among specimens of Group B and group D was found to be 3.45 MPa and 2.07 MPa respectively. While analysing statistically, it was observed that mean shear bond strength of specimens of Adper Easy One (3M ESPE) group was significantly higher in comparison to the specimens of Xeno V (Dentsply) group (p- value < 0.05). Also, saliva contamination resulted in significant reduction in shear bond strength of both the adhesive systems. Conclusion: Salivary contamination results in significant reduction in the dentin bond strength of adhesive systems.
Key words: Dentin bond strength, Adhesives, Salivary.