Fig.2 (preop PA): A 7x17 mm gingiva-level implant is planned at the site of the tooth #18.

When the tooth is extracted, the socket is extremely large.   The largest tapered tap (8x17 mm) basically drops into the socket; it is not stable in the socket (Fig.3).  It appears necessary to engage into the nascent bone, which is 8.37 mm long. 

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Xin Wei, DDS, PhD, MS 1st edition 04/10/2013, last revision 01/19/2018