There are two ways to form osteotomy.  First, create an osteotomy in the original socket.  The largest and longest implant (8x17 mm) will be engaged to the distal wall as well as buccal and lingual ones for primary stability.  The drawback is limited bone height (<3 mm).  In contrast, osteotomy in the mesial slope of the socket may be better (the 2nd method).

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Xin Wei, DDS, PhD, MS 1st edition 09/15/2014, last revision 09/15/2014