Abstract: A post for attaching a tooth crown to a natural tooth root is disclosed which comprises a screw-threaded shank having a plurality of collars in screw-threaded engagement therewith, the collars being adjustable axially of the shank. A method of attaching a tooth crown using the post as aforesaid is also disclosed, the method including the steps of engaging the shank with a pre-prepared tooth root, locating the collars in a requisite relative disposition on the shank, preferably with a collar against the tooth root face providing a shaped head on the shank and within which the collars are at least partially embedded, and applying a crown to the said shaped head.