To form a tapered osteotomy (red outline) with relatively straight reamers, the latter should be used in a step back fashion.  For example, the 2.5-4.5 mm reamers are to be used to create osteotomy at the depth of 11 mm, 5.0 at ~ 10 mm, 5.5 at 8 mm, and 6.0 at 6 mm (Fig.4).

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Xin Wei, DDS, PhD, MS 1st edition 03/08/2013, last revision 03/08/2014