Evaluation of Microleakage at the Junction Between Combined Amalgam/Composite Resin Restorations Using Different Bonding Systems in Class II Cavities

Objective: To evaluate the microleakage at junction between amalgam-composite resin restorations using different bonding systems. Material and Methods: In this in-vitro study, standard class II cavities were prepared on 40 human maxillary premolars. The axial gingival floor depths of 2 mm 1 below (cementoenamel junction), respectively. samples divided into 4 groups (n = 10). all groups, a layer 1-mm thick amalgam was used as coating for initial part floor. group 1, no system restoration. 2, G-Premio Bond applied. bond + alloy primer single in 3 4, rest then repaired FiltekZ250 composite. thermocycled 500 rpm immersed 1% methylene blue solution 24 hours to allow dye penetration. Once cut, placed under stereomicroscope (40X) determine rate. Data analysis carried out post-hoc Chi-square tests (p<0.05). Results: highest lowest rate related 3, There significant difference (1,2) (1,3), (1,4), (2,3) Conclusion: use could reduce two restorations.