Fig.6: A short abutment (A, 5x3 mm) is used so that it is high enough to hold perio dressing (D) in place; but short enough not to interfere with occlusion. 1: the upper right 3rd molar, which is not removed so that it can also help hold the dressing in place.
With re-adjustment of the trajectory, these two implants are parallel with clearance between them (between black arrowheads).
If the tissue level implants were longer, they would engage more into the sinus floor (white ^) with enhanced primary stability.
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Xin Wei, DDS, PhD, MS 1st edition 04/29/2014, last revision 01/19/2018