J Dent Sci. 2020 Dec;15(4):486-492. doi: 10.1016/j.jds.2020.04.007. Epub 2020 May 11. ABSTRACT BACKGROUND/PURPOSE: Despite the clinical appeal of restoring deep class II cavities in single increment using bulk-fill resin composite, sealing of bulk-filled composite restorations is a concern. This study evaluated interfacial adaptation of bulk-fill composite restoration to axial wall and gingival floor of class …