Assuming you're using IC5141 (you mentioned "icfb"), the only hope you have is if you've streamed out using the "Keep PCell" option on the stream out options form. This will create a directory called "KPDIR" with some side files with the info to allow it to map back the structures and structure references in the stream file back to the original pcell libraries.
If you have indeed turned this on, you need to turn on "Keep PCells" in the stream in options form when streaming in - and it will attempt to recover things.
If you're using IC61, this option does not exist. It was not re-implemented in IC61 because it was a) quite complex, b) only useful for a round-trip flow if you didn't change anything in the stream file, and c) not 100% reliable. My view was always that you should archive the original database rather than trying to restore from stream files...
If you've not got this "Keep PCells" option as a route, your only option is to restore from backup (I'm assuming you are doing backups!). Or if you're using design management from one of our connections partners, that would allow you to go back to an earlier version, assuming you'd checked in the data.