Fig.3 shows that the broken root is removed (black area) with infection area labeled as red.  To place an immediate implant, drills (Fig.4 white line) have to be used to extend the socket as long as possible.  A long implant will be stable.  The root tip infection, although mild, causes pain when drills are being used, in spite of several injections of an anesthetic.

Antibiotic &. Immediate Implant

Xin Wei, DDS, PhD, MS 1st edition 01/04/2015, last revision 01/04/2015