Figure 1. Microtensile bond strengths obtained by application of the adhesives to the 2 halves of the same tooth, with the electric-impulse-assisted application technique or with the control bonding protocol recommended by the manufacturers. Premature failures due to preparation procedures were not included in the statistical analysis. Values are mean ± standard deviation [number of premature failed sticks/number of intact sticks tested]. Groups with the same superscripts are not statistically different (p > 0.05).