Fig. 5: PA is taken after insertion of parallel pins at the depth of 10 and 8 mm at the sites of #30 and 31, respectively (red line outlines the upper border of the inferior alveolar canal and mental nerve loop).  It appears to be safe to increase the lengths of the implants by 2 mm.

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Xin Wei, DDS, PhD, MS 1st edition 12/18/2013, last revision 12/18/2013