When a 4.5x20 mm tap is inserted at the site of #8 (Fig.5), it is stable.  A 3.5x20 mm tapered drill is at the site of #9 for parallelism.

The insertion torque for the implants (4.5x20 mm and 4x20 mm) are 40 and 60 Ncm for #8 and 9, respectively (Fig.7).  The stability is probably due to the fact that these two implants are engaged into the two cortical plates of the sockets (arrowheads).

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Xin Wei, DDS, PhD, MS 1st edition 02/03/2013, last revision 01/21/2019