Mesial movement of upper incisors within the bone

During tooth leveling with the opening wires, there is a tendency for upper incisors to move mesially due to bracket tip, as previously discussed. In Class III cases, this is normally beneficial, and moves the upper incisors towards PIP. Likewise, at the rectangular HANI'and the rectangular steel wire stages, the A/P expansion and torque effects tend to produce beneficial changes for most Class III cases. This can be further augmented by the use of Class III elastics. Because of these spontaneous tooth movements during tooth leveling and aligning, the early management of the upper arch in mild Class III cases is normally straightforward.

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