Fig.6: A D2 implant (4.5x20 mm) is going to be placed with the flat surface facing mesially, convex surface distally and the long axis of D buccolingually (5.5 mm at its widest portion).  In contrast, the distance between the flat and convex surfaces is 3.5 mm (at its widest portion).  The ratio of D is quite similar to that of the socket.

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Xin Wei, DDS, PhD, MS 1st edition 04/23/2014, last revision 01/19/2018