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After removal of granulation tissue lingually, the osteotomy starts in the septum, more buccal, with a 2 mm pilot drill. PA is taken with a parallel pin (Fig.6 P). The osteotomy is sequentially enlarged with reamers, followed by insertion of taps (Fig.7 T: 6x17 mm (14 mm deep)).
It is critical to take the first intraop PA with the parallel pin. Trajectory is determined and can be changed if needed. The distance to the upper border of the Inferior Alveolar Canal (yellow dashed line) is confirmed.
Xin Wei, DDS, PhD, MS 1st edition 02/19/2015, last revision 01/19/2018