Clinical Comparison of Bulk-fill and Incremental Composite

The clinical performance of a 5-mm bulk-fill and an incremental resin composite in class II restorations will be evaluated and compared. After recruiting participants with at least 2 approximal caries lesions, all restorations will be placed by a single clinician. All caries lesions will be removed before restoring. Cavities will be divided into two groups: a 5 mm bulk-fill composite resin \[Filtek™ Bulk Fill Posterior, 3M ESPE, St. Paul MN, USA (FB)\] and an incremental posterior composite resin \[Filtek Ultimate Universal, 3M ESPE, St. Paul MN, USA (FU)\] All restorative procedures will be conducted according to manufacturers' instructions. Restorations will be scored using modified United States Public Health Service (USPHS) criteria after a week (baseline) 6, 12, 24, 36 and 48 months. Descriptive statistics will be performed using chi-square tests.