Table 1.
Materials used in this study.
| Adhesive Systems | Components | Batch number | Manufacturers’ Recommended Protocols |
|---|---|---|---|
| Adper Single Bond (3M ESPE, St. Paul, MN,USA) | Bis-GMA, HEMA, dimethacrylates, methacrylated polyalkenoic acid, copolymer, initiators, water and ethanol. | 20000630 | a (15s); b (10s); c; d; h (5s), i (10s) |
| OptiBond Solo Plus (Kerr Corp. Orange, CA, USA) | Bis-GMA, HEMA, GPDM, initiator, ethanol, fumed silica, barium aluminoborosilicate and sodium hexafluorosilicate. | 14088 | a (15s); b (10s); c; e (15s); h (3s); i (20s) |
| Prime & Bond NT (Dentsply Caulk, Milford, DE) | UDMA, PENTA, R5-62-1 resin, T-resin, D-resin, butylated hydroxitoluene, EDMAB, cetylamine hydrofluoride, initiator, stabilizers, acetone and fumed silica nanofillers. | 306000197 | a (15s); b (10s); c; f; g (20s); h (5s); i (10s) |
| Adper Single Bond 2 (3M ESPE, St. Paul, MN, USA) | Bis-GMA, HEMA, dimethacrylates, methacrylated polyalkenoic acid, copolymer, initiators, water, ethanol and silane-treated silica nanofillers. | 100076 | a (15s); b (10s); c; d; h (5s), i (10s) |
Abbreviations: Bis-GMA: bisphenol-glycidyl methacrylate; HEMA: 2-hydroxyethyl methacrylate; GPDM: glycerol phosphate dimethacrylate; UDMA: Urethane dimethacrylate; PENTA: phosphonated penta-acrylate ester; EDMAB: Ethyl 4-dimethyl amino benzoate. Application techniques – a: acid etching; b: rinsing; c: excess moisture removed from the preparation using a cotton pellet; d: application of two consecutive coats of adhesive; e: aplication of one coat of the adhesive; f: application of three consecutive coats of adhesive; g: the surface should remain fully wet; h: gently air-drying; i: light-cure.
Note: The brand name of Adper Single Bond 2 is used in Latin America and Oceania, while Adper Scotchbond 1 XT is used in Europe, Adper Single Bond Plus in the USA and Adper Single Bond 1 XT in South Africa.