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In contrast to #2 implant, the insertion torque of a 5x9 mm implant at #18 (Fig.1) is less than 10 Ncm because of depth difference between 2 implant systems. The design is for 5x10 mm. In fact each drill has its inherent 1.2 mm long tip. The 8.5 mm drilling depth is enough for 9 mm implant.
Xin Wei, DDS, PhD, MS 1st edition 10/29/2019, last revision 02/23/2020