Fig.7 (intraop occlusal mirror view): The buccal and lingual gaps (*) are bone grafted again and require a coverage to match the shape of the socket (trapezoidal).  A short abutment is placed (A) for fabrication of an immediate provisional to contain the bone graft. 

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Xin Wei, DDS, PhD, MS 1st edition 03/09/2013, last revision 01/19/2018