Finally using Lindamann bur, the osteotomy is changed so that a 3.5x13 mm 2-piece implant does not need an angled abutment to establish occlusion (Fig.19).  There is one palatal thread exposure.  Allograft is placed circumferentially, followed by Human Amnion-Chorion Allograft and Collagen Plug.  A 4.5x5.5(3) mm appears to be seated incompletely with a gap between the abutment and the implant (Fig.24 <, overtightened?).  A provisional is fabricated after heavy palatal reduction. 

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Xin Wei, DDS, PhD, MS 1st edition 01/15/2020, last revision 03/19/2020