MiniMono Clarity Elegance Brilliant Brilliant+ Etching                 MPa                              ARI 4.89     +/- 0.63 1 (15) 3.24    +/-0.47 1 (14), 3(1)  3.66    +/-0.97 1 (14), 2(1) 3.45    +/-0.34 1 (13), 2(2) 4.3+/-0.54 1 (15) Air-abrasion        MPa                              ARI 1.69*+/-0.58 3(15) 2.05*+/-0.49 3(15) 1.89*+/-0.3 3(15) 0.99*+/-0.51 3(15) 2.32*+/-0.83 3(15) Air-abrasion        MPa + etching              ARI 5.21     +/-0.63 1 (15) 3.48    +/-0.43 1 (15) 4.21     +/-1.28 1 (12), 2(3) 3.78 +/-0.56 1 (15) 4.31  +/-0.54 1 (14), 3(1)

Table.1: Mean bond strengths in MPa, standard deviations and ARI scores. Significant differences (p<0.05) between the bond strength of the three pre-conditioning methods within one bracket type are marked with an asterisk “*”.ARI score for tensile testing: 1 = composite remaining on the enamel, 2 = composite remaining on both sides, 3 = composite remaining on the bracket. The number of samples displaying a certain ARI score is given in parenthesis.