Comparative Evaluation of Microleakage of Composite Restorations Using Fifth and Seventh Generations of Adhesive Systems

Introduction: simultaneous etching of enamel and dentin using the novel generation of adhesive systems with contracted operational steps, has shown a good clinical efficacy. the aim of this study was to evaluate the microleakage of composite restorations using the v and vii generations of adhesive systems on primary teeth.methods: this study was performed on 45 human intact extracted primary teeth. following class v cavity preparation, the samples were randomly divided into three groups included 15 teeth based on the type of bonding agent; single bond 2, clearfil s3 bond or g bond. after applying the bonding agents, the teeth filled with composite z250. the microleakage values of incisal and gingival margins were separately scored by 2% basic fuchsine staining based on a 0-3 ordinal ranking system. the data were analyzed by using kruskal wallis and mann_whitney u tests.results: in overall, the score of microleakage at incisal (0.58±0.94) and gingival (1.06±0.19) edges did not have significant difference. also, there was no significant difference between incisal and gingival microleakage considering the different types of bonding.conclusion: regarding to less operational steps and lower risk of salivary contamination, the vii generation of dentin bonding agents can be applied for filling the class v cavities of primary teeth.