When a 5x20 mm tap is inserted at the depth of 17 mm, it is close to the mental loop (Fig.4, dashed line).  *: gap in the mesial aspect of the socket, which disappears when a 6x17 mm implant is placed.

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Xin Wei, DDS, PhD, MS 1st edition 05/18/2013, last revision 01/19/2018