It appears that the palatal root (Fig.6 P) is separated from the buccal ones (MB, DB).

The ridge and the socket are particularly wide buccopalatally.  The implant should be as large as the mesiodistal width of the socket allows.

Upper 1st Molar Septum Placement

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