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A 2 mm pilot drill has to be used (Fig.3); the latter happens to have penetrated the mesial slope of the socket (pink dashed line). The advantage is to obtain higher primary stability in the mature bone than that in the middle of the socket. Therefore the length of the osteotomy can be shorter (14 mm instead of 17 mm).
Xin Wei, DDS, PhD, MS 1st edition 12/10/2014, last revision 12/11/2014