Fig.1: The upper right central incisor (#9) fractures.  I: incisive canal. 

Fig.2: 2 mm pilot drill (D) is close to the incisive canal.  Bone expansion technique will be employed to push the lateral wall of the incisive canal medially while developing osteotomy.

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Xin Wei, DDS, PhD, MS 1st edition 06/19/2013, last revision 06/23/2014