Fig.1: The initial osteotomy at the site of the upper left 1st molar is created by a 1.6 mm pilot drill at the depth of 6 mm.  The drill drops in easily, indicating the low density bone.  Bone expansion is necessary.

There is a sinus septum above the black line.  It is advantage to engage the implant to the septum.  Therefore, sinus lift is indispensible.

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Xin Wei, DDS, PhD, MS 1st edition 07/10/2013, last revision 07/10/2014