comparison of microleakage of selfetch and totaletch bonding agents in primary molar class ii composite restorations

Introduction: this study evaluated microleakage of flowable and conventional composite in primary molar class ii restorations using selfetch and totaletch bonding agents. methods: class ii standard cavities were prepared on proximal surface of 48 primary molars. these cavities were restored using grandioflow and grandio composites and futurabond dc and solobond m as bonding agents. teeth apices were sealed by wax and twolayer nail varnish was applied up to 1mm of restoration margins. samples were subjected to thermocycling, stained by silver nitrate solution and sectioned mesiodistally. microleakage was measured from the toothrestoration margin to end point of dye penetration using a stereomicroscope with a 03 scale. microleakage scores were analyzed using kruskalwallis test in 4 groups and paired comparisons were performed using monte carlo test. results: microleakage was seen in all composite and bonding agent groups. pairwise comparison showed no significant difference regarding the microleakage between groups ( p>0.05) . conclusion: gradioflow as a flowable composite and futurabond dc as a selfetch bonding agent both showed acceptable results in regard to microleakage. considering the ease of application of flowable composites compared to conventional ones and shortening the treatment both flowable composites and selfetch bonding agentshave showed promising results in pediatric dentistry