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When a 4x11 mm FC is placed to the depth at #13 (last drill 3x13 mm (10.5 mm offset), the palatal crestal bone is indistinct on probing. The implant is then placed ~ 1 mm deeper. To avoid contact between the future abutments and the mesiobucco-distal crest, a 5.5 mm profile drill is used. It appears that a 5x4 mm healing abutment has clearance from the crest (Fig.1,2 C).
Xin Wei, DDS, PhD, MS 1st edition 03/10/2020, last revision 03/31/2020