After the 3.8x14 mm implant (Fig.2) is removed, a 4.1 mm tap drill (Fig.3 T) is manually inserted partially (not as deep as the previous implant) to predict whether a 4.1 mm implant can bind to the bone tightly or not. Red ^: the nasal floor.

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Xin Wei, DDS, PhD, MS 1st edition 07/20/2013, last revision 01/19/2018