A 64-year-old man who clenches his teeth has wedge-shaped non-carious cervical lesions, 1.5 to 2 mm deep, on the buccal surfaces of 14, 15, 24, 25 and 34. The dentine is shiny and sclerotic and the gingival margins are in cementum. He has lost two previous composite restorations from these sites and asks for the option least likely to come out again. Based on clinical trial evidence, which restoration has the best retention in lesions like these?