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After 4.5x7.3 mm drill with 3 O-rings at #15, use 2.2x7.3 mm one with 2 O-rings. The sinus floor feels like to be perforated, but perio probe does not find the perforation. Nose blowing does not reveal air leakage. It seems fine when 3.0x7.3 mm one with 2 O-rings is being used. The sinus membrane perforates when Magic Sinus Lifter is used. Mixture of autogenous bone (from drills) and allograft does not stick to the periosteal elevator (Fig.1).
Xin Wei, DDS, PhD, MS 1st edition 02/22/2019, last revision 02/22/2019