Clarity Elegance Brilliant Brilliant+ MiniMono e, + e, + e, a, + e, + Clarity   a, a e, + Elegance     a e, a Brilliant       e, a, +

Table 2: Statistical significance (p<0.05) between the bracket types in relation to the three pre-conditioning methods. A significant difference between brackets is marked with e for conventional etching, aforair-abrasionand +for air-abrasion+etching.