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Fig.3: The SD is a type of trephine bur with a hollow center.
Fig.4: A dimple of the initial osteotomy has been created with MB so that SD does not wobble while it is being used. The dimple is not smooth, because MB has to be perpendicular to the slope surface initially and then changes its trajectory.
Xin Wei, DDS, PhD, MS 1st edition 11/24/2016, last revision 11/24/2016