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After the last drill (3.5x11.5 mm, Fig.10 pink) and before 4x11.5 mm implant, use Lindamann bur to remove the coronal portion of the lingual plate (Fig.11 red line) to prevent implant buccal deviation.
Xin Wei, DDS, PhD, MS 1st edition 12/21/2019, last revision 12/22/2019