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To avoid osteotomy deviation over the septum, a 12 mm bone trimmer is used, followed by point drill (Fig.3 *). It appears that the concavity is a little too deep. Next time try a shorter trimmer first and check. It seems that deviation is initiated.
Xin Wei, DDS, PhD, MS 1st edition 05/28/2020, last revision 05/31/2020