Shorter Drilling Sequence.  Probe the sinus floor after every 7.3 mm drill for perforation.  After 4.5x7.3 mm one, use 4.5x10 mm dummy implant or Sinus Approach Bur/Drill if necessary.

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Xin Wei, DDS, PhD, MS 1st edition 02/13/2020, last revision 02/21/2020