question: Compared to Z250 conventional composite what was the result of 3M bulk fill on Microleakage of Two Bulk Fill and One Conventional Composite in Class II Restorations of Primary Posterior Teeth?
context: 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).