| Adper Scotchbond 1XT
(3M ESPE, St. Paul, MN, USA) | (1) Phosphoric acid etching
(Scotchbond Universal Etchant; lot number: 568712; 35% phosphoric acid) | 15 s | | Water spray | 10 s | | Blot dry (cotton pellet) | — | (2) Adper Scotchbond 1XT (3 coats; lot number: N597610; BisGMA, HEMA, dimethacrylates, a methacrylate functional copolymer of polyacrylic and polyitaconic acids, ethanol, water, initiators, silane treated silica)
(i) without/with 1% BAC | 15 s | | Short air dry | (~5 s) | | (3) Light-cure | 10 s |
| OptiBond FL
(KerrHawe, Scafati, Italy) | (1) Phosphoric acid etching
(Kerr Gel Etchant; lot number: 5329366; 37.5% phosphoric acid) | 15 s | | Water spray | >15 s | | Air dry | >3 s | (2) OptiBond Prime (lot number: 5296441; HEMA, GPDM, MMEP, ethanol, water, photoinitiator)
(i) without/with 1% BAC | 15 s | | Short air dry | (~5 s) | | (3) OptiBond Adhesive (lot number: 5344022; BisGMA, HEMA, GPDM, photoinitiator, filler) | 15 s | | Short air dry | (~3 s) | | (4) Light-cure | 10 s |
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