After 3.5x7.3 mm drill with 1 O-ring, 2.2x7.3 mm drill without ring and 2.2x8.5 mm drill are used.  Then the sinus floor is thin and breaks with 4x10 mm dummy implant.

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Xin Wei, DDS, PhD, MS 1st edition 05/26/2021, last revision 06/09/2021