The apical end of each expander is flat and smooth, which is suitable for sinus lift (Fig.3).  The first line of the first black band is 8.5 mm.  The second line of the first black band is 10 mm.  The first line of the second black line is 11.5 mm, while the second line of the second black band is 13 mm.  It is important to remember these marks to control the depth of bone expansion and sinus elevation.

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Xin Wei, DDS, PhD, MS 1st edition 07/12/2013, last revision 02/12/2021