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A 1.5 mm pilot drill initiates osteotomy 8 mm in length (Fig.1 D). The drill is more or less in the middle of the edentulous space and 1 mm coronal to the sinus floor (^). Then a 2 mm pilot drill and 2.5 mm and 3 mm reamers are used to enlarge osteotomy (8 mm deep). Mixture of autogenous bone and Osteogen and 2.5 mm Bicon osteotome are used for sinus lift. The osteotome does not reach the intended depth of 10 mm. The osteotomy is extended with the 2 mm drill and 2.5 mm reamer (Fig.2 R) to barely perforate the sinus floor (^).
Xin Wei, DDS, PhD, MS 1st edition 01/14/2015, last revision 01/14/2015