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With the longer parallel pin at #4, a 4 mm trephine bur is used for 2 mm at #3; a piece of bone is removed (possible the oral cortex, Fig.2 black area). A 3.5 mm osteotome with a concave tip (Fig.5 pink outline) is used with a mallet for sinus lift without success. A 2 mm osteotome with a pointed tip is used for further osteotomy for ~ 1 mm (Fig.3).
Xin Wei, DDS, PhD, MS 1st edition 08/24/2015, last revision 08/25/2015