Power Outage, Now System Doesn't See Devices

I'm away on vacation, and had a power outage at home where the system is (~12 hours).  The hub is back up and running, and the camera device is working, but none of the sensors (door, motion) are listed in the Devices list, and the system doesn't find them when refreshed.  Short of pushing the button on top of the sensor, is there a way to get them re-added?