Fig.10 (buccal view): The buccal gap is filled with bone graft (<).  The gingival margin around the tissue-level implant (I) is not even, higher buccolingually, lower mesiodistally.  Bone graft prevents exposure of the rough surface and  threads (below the smooth surface) from being exposed   A: abutment, which is used to retain perio dressing. 

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Xin Wei, DDS, PhD, MS 1st edition 09/04/2014, last revision 01/19/2018