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Remove guide after the last drill to check perforation. The depth of it is 7.3+1.2-4=4.5 mm, whereas the bone height is 5.25-5.33 mm. Measure the length of the last drill and choose 1 mm longer sinus drill. The water lift. Then 2 mm longer sinus drill and probe.
Xin Wei, DDS, PhD, MS 1st edition 10/03/2019, last revision 11/06/2019