hello and welcome,
As you have mentioned , prosthetic crown coverage was done on your tooth without root canal treatment
done, that means your tooth is vital and due to grinding of the tooth before crown coverage , the dental pulp or nerve
tissue may have got irritated that leads to pain and sensitivity.
Since its been a long the crown was put , Marginal leakage of the saliva or other bacterial debris through the crown may infect the tooth portion which is already exposed and soft.
i wouls suggets you to visit a dentist
and get a X RAY
examination done which will confirm you if the tooth is involved and needs root canal treatment to remove the infection.
If the tooth is not infected you can simply replace the crown coverage by a new one.
i hope this helps,