Clinical Performance of Bulk-fill Restorations in Class II Cavities

To assess the performance of bulk-fill restorations on premolar teeth in class II cavities using some selected FDI criteria, a total sample size of 30 (10 for each group test) will be sufficient to detect: an effect size of 1.22 at a power (1-β error) of 0.8 and using a two-sided hypothesis test and a significance level (α error) 0.05 for data. Two teeth will be added to each group to compensate drop out samples.