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In fact bone density seems to be low during osteotomy except in the crestal cortex. The last drill (3.5x13 mm) changes to 3.0x13 mm. When a 4x11 mm FC implant is being placed, torque is low until the last 1-2 mm.
Xin Wei, DDS, PhD, MS 1st edition 03/05/2020, last revision 04/01/2020