Due to atrophy of the most coronal ridge buccally at #25 (Fig.1,2 *), osteotomy is initiated difficult and distal (Fig.3).  After 1.2 mm drill removal (Fig.3' black area), Lindamann bur is used to move the osteotomy mesial (red area).

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Xin Wei, DDS, PhD, MS 1st edition 01/28/2019, last revision 01/28/2019