“…The qualitative synthesis of the studies included in this systematic review are summarized in Table 2 . Several strategies were identified: Air abrasion [ 58 , 59 ], application of crosslinking agents [ 57 , 60 , 61 , 62 , 63 , 64 , 65 ], application of dentin desensitizers [ 66 , 67 ], use of matrix metalloproteinases (MMP) inhibitors [ 10 , 68 , 69 , 70 , 71 , 72 , 73 , 74 , 75 , 76 , 77 ], the use of the ethanol-wet bonding technique [ 78 ], application of an extra hydrophobic resin layer [ 56 , 79 , 80 , 81 , 82 , 83 , 84 , 85 ], dentin pretreatment with laser [ 55 , 86 , 87 , 88 , 89 , 90 , 91 , 92 ], multiple layer application [ 93 , 94 , 95 , 96 , 97 , 98 , 99 ], non-atmospheric plasma [ 100 , 101 ], prolonged curing time [ 102 ,…”