After extraction of the oval-shaped residual roots at #12 (Fig.1), osteotomy is initiated in the palatal socket for 18 mm; since the root of the canine curves distal (Fig.2 red dashed line), the osteotomy cannot afford to move mesial and extend more apical.

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Xin Wei, DDS, PhD, MS 1st edition 08/25/2018, last revision 11/10/2018