“…Although, to certain recollection, cavity design was not radically different between the groups, it is acknowledged that, as the operator's experience with the bonding technique developed, it could have decreased the level of emphasis placed upon mechanical cavity preparation features. Although the use of rubber dam has been advocated to improve the longevity of dental restorations, 42,43 it was not applied for any restorations placed in this study. It is acknowledged that, had scrupulous cotton wool roll isolation and the use of high volume aspiration not been in place, this could have affected longevity.…”