Insertion of gutta percha (Fig.2 >) points to the apical radiolucency of the anterior abutment (*, with less defined border ).

The radiolucency immediately apical to the apex of the affected tooth has better defined border.  It is possibly the mental loop.

Loop

Xin Wei, DDS, PhD, MS 1st edition 09/05/2013, last revision 01/01/2014