When a 5x17 mm tap is inserted (Fig.4), it is stable. 

A 5x17 mm implant is placed with high insertion torque (Fig.5,6).  Primary stability appears to be derived from apical new bone (Fig.5) and the septal struts (Fig.6 St). 

Septal Struts

Xin Wei, DDS, PhD, MS 1st edition 04/24/2015, last revision 04/25/2015