When a narrower abutment with longer cuff is placed at #15 (6x4(4) mm in Fig.6, as compared to 6.5x4(3) mm one in Fig.2), there is no gap between the implant and abutment.  In contrast there is one at #13 (Fig.6 <) when a 4x4(4) mm abutment is seated following removal of a 4x4 mm healing abutment.  The crestal bone may block abutment seating.  A 4.6 mm profile drill will be used to remove the blocking.

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Xin Wei, DDS, PhD, MS 1st edition 03/09/2020, last revision 04/13/2020