Abstract
Levelling and aligning is usually the first step in the mechanical execution of an orthodontic treatment plan. Most often, this is achieved by inserting wires of increasing stiffness into the brackets of malaligned teeth. The force systems generated by placing straight wires into crooked brackets may or may not result in favorable tooth movement depending on the geometric relationships among the brackets and the outcome desired. Analysis of the relationships between adjacent teeth will show whether the force systems produced by insertion of a straight wire will be desired or not. Alternative treatment strategies, including the use of extraoral, interarch, or auxiliary appliances, may be indicated when the anticipated side effects of straight wire alignment are unfavorable. Evaluation of the force systems produced during orthodontic leveling and aligning can improve treatment efficiency and help avoid unexpected tooth movements.
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