From the context being discussed here, it sounds like you're discussing the Integrity Manager/Workflows & Documents side of Integrity Lifecycle Manager. Regular item edits can't be "recovered". They are either committed to a save or lost.
As of Integrity LM 10.8 (going by memory--it might actually be 10.7), when editing a document, a crash or restart of the client will result in the document being recovered when the client is restarted and reconnected to the server.
Kind Regards, Kael Lizak
Senior Technical Support Engineer PTC Integrity Lifecycle Manager