The distobuccal plate is defective upon extraction; the osteotomy is initiated in the mesiolingual slope of the socket (Fig.4) with ~ 6 mm native bone.  When a 3.8x15 mm dummy implant achieves insertion torque of 50 Ncm, the insertion is incomplete with apical space (Fig.5 *).

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Xin Wei, DDS, PhD, MS 1st edition 08/16/2018, last revision 08/16/2018