It is possible to use a plastic or stainless steel prefabricated crown.
 Most often this is done as a temporary crown, or in children's teeth,
where they are not required to hold up a long time.
    When done intentionally for long-term use, they are usually a last
resort before extracting the tooth.  The fit at the gumline and the
bite, the contact with the adjacent teeth cannot be controlled as well.
 IOW, this is a poor substitute for a custom-made crown of ceramic or
ceramometal restoration.

Steve