Traditionally, it has been recommended that pre-adjusted appliance brackets be placed with the twin bracket wings straddling, in a parallel fashion, the vertical long axis of the clinical crown, and that the center of the bracket slot be placed on the center of theclinicalcrown.1 Potential errors or potential deviations from his desired position can occurs follows: Horizontal bracket placement errors. These can normally be avoided with careful technique. Axial or paralleling bracket placement errors. These can normally be avoided with careful technique.