In cases where the post space is not a good match for a prefabricated post, a cast post and core can be custom fabricated for the tooth.This involves creating a post space inside the root of the tooth and customizing a post and a filling together as a single unit to snugly fit into the space created.

Where a metal post could be difficult to conceal, a custom post made of zirconia oxide can be made, its tooth colour leaves less of a shadow under the final restoration.