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After using a surgical stent and a 2 mm pilot drill at the depth of 8 mm, three parallel pins are inserted at the sites of #18-20 for trajectory and depth check (Fig.2; red dashed line: the upper border of the Inferior Alveolar Canal).
Xin Wei, DDS, PhD, MS 1st edition 07/04/2015, last revision 07/04/2015