Fig.1: CBCT sagittal section of the teeth 12-15(#13,14 surgical stent for CT scan).  The red boxed area represents a 8x11 Tatum screw implant to be engaged into both the mesial and distal walls of the concave sinus floor for primary stability.

Fig.1' simulates sinus lift (<).

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Xin Wei, DDS, PhD, MS 1st edition 04/28/2013, last revision 04/28/2013