The sinus membrane perforates at #15 when the sinus probe is being used.  Luckily the perforation appears to be repaired with 2 pieces of PRF; sinus lift is assisted with a 4.5x10 mm dummy implant (Fig.2 *).   M: no stop fixture mount.

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Xin Wei, DDS, PhD, MS 1st edition 10/25/2019, last revision 02/08/2020