Uprighting and distalizing of the lower first molars occurs because of inter-occlusal forces. The combination of uprighting and distalizing may provide sufficient space in the lower arch resulting in uprighting of the lower anterior teeth, with the incisal edge of the lower incisors reaching the facial plane and the lower inclina tion approaching 90° in relation to the mandibular plane. These factors are all considered to favor stability of the end result.
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