CT (Fig.3) reveals that the bone density in the zones 2 and 3 of the septum (where the osteotomy will be formed) is lower than zone 1 (250 vs. 750 Hounsfield units).  Bone expansion is necessary for primary stability. M: sinus membrane; P: palatal (root).

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Xin Wei, DDS, PhD, MS 1st edition 08/21/2014, last revision 03/15/2020