When the 1st intraop PA is taken with a 4.5x20 mm tap (Fig.6: T), the deviation is not noted (7.5 mm vs. 5.5 mm in Fig.5). The space between arrowheads is the mesiobuccal socket.  This also suggests that the tap is placed distally.

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Xin Wei, DDS, PhD, MS 1st edition 05/09/2013, last revision 05/09/2014