After use of 6 mm profile drill, a 4.5x4(3 (longer cuff)) mm abutment is able to be seated apparently completely without a gap (Fig.6 <).  The third round of bone graft (Fig.6 *) is placed around the abutment to make sure that the underlying implant is fully covered to reduce periimplantitis in the future. 

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Xin Wei, DDS, PhD, MS 1st edition 02/07/2020, last revision 06/02/2020