Hello there ,
Thanks for writing your query,
According to your clinical history i suspect you had a PIN RETAINED amalgam restoration over your tooth .
usually post with crown preparation is done only after the tooth is devitalised by root canal
in your case as you have mentioned you have no symptoms of pain and discomfort related to the tooth , we need to check the vitality of the tooth before replacing the crown.
exact diagnosis can be made only after clinical examination and evaluation by taking radiographs.
if needed , Root canal procedure is done to disinfects the tooth by removing the infected nerve
tissue and the root canals are cleaned,shaped and filled with permanent restorative material.
Once the treatment is completed , the tooth can be restored by a post and core preparation with a prosthetic crown coverage.
i hope this helps ,