“…Six studies [ 14 , 18 , 21 , 23 , 26 , 27 ] reported that the etching and rinsing method was used and 12 studies [ 16 , 17 , 19 , 20 , 21 , 22 , 25 , 26 , 28 , 29 ] used the self-engraving method. The adhesives used in the studies were: Single Bond Universal Adhesive [ 15 , 27 , 29 ], Clearfil SE Bond [ 14 , 22 , 29 ], Xeno III [ 20 , 21 , 26 ], Xeno V [ 17 , 19 ], AdheSE Bond [ 16 , 29 ], OptiBond All-in-One [ 28 , 29 ], Adper Single Bond 2 [ 18 , 23 ], Syntac classic [ 21 , 26 ], XP Bond [ 23 ], Tetric N Bond Total-etch [ 24 ], Scotchbond Universal Adhesive [ 25 ], Excite F [ 18 ], Futurabond NR [ 20 ], and Peak Universal [ 23 ]. The composite resins used in the studies were inserted in the cavities with the following placement techniques: (1) the incremental method, involving Filtek Z550 [ 14 ], Charisma Smart Composite [ 15 ], Filtek Z350 XT [ 22 ], Amelogen Plus [ 23 ], Tetric EvoCeram [ 16 , ...…”