The posterior 3-unit should be able to dislodge after sectioning (Fig.2).  Check whether there is the similar lesion associated with #28 (<).  The tooth #31 should be afforded not to be restored, since there is a small inlay prep mesially.

From Bridge to Implants

Xin Wei, DDS, PhD, MS 1st edition 03/15/2015, last revision 03/15/2015