After a 4x10 mm implant is placed with fixture mounting (Fig.2 M) following sinus lift (*) at #12, osteotomy is initiated at #10 (Fig.1 (T: tube of surgical guide)).  It appears that the drill (D) has good trajectory (between the Incisive Canal (red dashed line) and the canine root).

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Xin Wei, DDS, PhD, MS 1st edition 06/14/2019, last revision 02/11/2020