evidence: The three groups were not significantly different in terms of occlusal or gingival microleakage (P>0.05), but gingival margins showed significantly higher microleakage than occlusal margins in all three groups (P<0.05).
intervention: SonicFill bulk fill
comparator: Z250 conventional composite
outcome: Microleakage of Two Bulk Fill and One Conventional Composite in Class II Restorations of Primary Posterior Teeth