The lingual plate is thick and dense (Fig.2 L).  To prevent drill and implant deviation buccally, a 5x11.5 mm implant will be placed as lingual as possible. A 5 mm cortical drill will be used before 2.2-4.5 mm ones being used for depth.  The 4.0 mm drill will reach the final depth (apical underprep).  A 17 mm long tissue-level implant will be placed.  17-5.5=11.5 mm (thread portion); 1.2 mm drill tip for the rough surface.

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Xin Wei, DDS, PhD, MS 1st edition 12/21/2019, last revision 04/14/2020