Aim: The aim of the study was to evaluate the microleakage between two different generations of bonding agents using fluid filtration model. Materials and methods: In total, 60 human extracted mandibular molars were used in the study. The samples were divided into three groups, group I—Adper Scotchbond primer and adhesive, group II—Single Bond Universal adhesive, and group III—control group. All the samples were restored and stored in distilled water for 24 hours followed by thermocycling in water bath for 1,000 cycles between 5 ± 2°C and 55 ± 2°C, for dwell time of 30 seconds and transfer time of 10 seconds. The samples were then tested for leakage under fluid filtration model. Results: There was a statistically significant difference between the leakage in between the two groups. The difference was found to be statistically significant (p < 0.05). Single bond group showed better adhesion and less leakage compared to the Adper Scotchbond primer and adhesive. Conclusion: Single Bond Universal adhesive (3M) showed the least amount of microleakage when compared to Adper Single Bond 2 and Adper Scotchbond primer and adhesive. Fluid filtration model was successfully constructed and worked efficiently and can be considered as one of the ideal methods for evaluation of microleakage.
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