Table 1: Test materials, classifications, and compositions.

Adhesive system (manufacturer)Lot numberClassificationComposition

Adper Single Bond 2 (3M ESPE)#N508311Two-step etch-and-rinseBis-GMA, HEMA, polyacrylic acid, poly(itaconic acid), water, ethanol, dl-CQ, silica (10% wt).
Ambar (FGM)#240215Two-step etch-and-rinseUDMA, HEMA, 10-MDP, hydrophilic methacrylated monomers, ethanol, silica nanofiller, photoinitiators, coinitiators, stabilizers.
Adper ScotchbondPrimer: #N560292Three-step etch-and-rinsePrimer: HEMA, polyalkenoic acid polymer, water.
Multi-Purpose (3M ESPE)Bond: #N551363Bond: Bis-GMA, HEMA, tertiary amines, photoinitiator.
Scotchbond Universal (3M ESPE)#569736Two-step etch-and-rinse or one-step self-etchBis-GMA, HEMA, ethanol, water, silane treated silica, 2-propenoic acid 2-methyl-, reaction products with 1, 10-decanediol and phosphorous oxide (P2O5), copolymer of acrylic and itaconic acid, CQ, 4-dimethylaminobenzoate, toluene.
Ambar Universal (FGM)#030815Two-step etch-and-rinse or one-step self-etchUDMA, HEMA, 10-MDP potentiated, hydrophilic methacrylated monomers, ethanol, silica nanofiller, photoinitiators, coinitiators, stabilizers.
OptiBond All-In-One (Kerr)#5125872One-step self-etchGPDM, HEMA, GDMA, Bis-GMA, water, 2.5–3 acetone, ethanol, CQ, silica filler, sodium hexafluorosilicate.

Bis-GMA, bisphenol A diglycidyl methacrylate; HEMA, 2-hydroxyethyl methacrylate; CQ, camphorquinone; UDMA, urethane dimethacrylate; 10-MDP, 10-methacryloyloxydecyl dihydrogen phosphate; GPDM, glycerol phosphate dimethacrylate; GDMA, glycerol dimethacrylate.