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.

Fig.4: The 4.1x14 mm implant has to be placed high (subcrestal, <--) in order to get a high insertion torque (<35 Ncm).  The gap (<) appears smaller than that in Fig.2.  In fact, the tap drill appears to be larger than the corresponding implant, which is wrong.

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