Tooth Sensitivity for over 5 Months on New Crown

if pain,discomfort and temperature sensitivity to hot and cold, ask your dentist to take xrays in different direction to check the fit. If the fit is not right you need to redo. Check the bite again for possible adjustment, and if the decay was too close to the nerve you might need root canal.If you grind or clench your teeth, a night guard is a must!

It is common to have some sensitivity following the placement of a new crown.  It sounds as though it is somewhat improving, but not completely gone yet.  I would say that you should give it more time.  Your dentist is correct in stating that you could be grinding and the  minor differences in your bite from the new crown could be causing the tooth to stay bruised.  I would consider an occlusal guard that you would wear at night to see if the remaining discomfort subsides.  If it does not,  then perhaps seeing an endodontist for the potential need for a root canal would be a good idea.  Good luck. 

I know that a sensitive tooth can be a real pain to deal with, no pun intended. Getting a crown placed requires a lot of steps that can irritate the tooth...water spray, air spray, sculpting down the tooth....all for a good reason, which is to protect and restore your tooth. These things can irritate the nerve of the tooth and it can take time for sensitivity to subside. 
A dentist can check all of the directions your teeth can slide and hit together. One tiny interference from a sideways motion can cause this sensitivity. Sometimes these interferences are difficult to replicate. If the crown is adjusted and the interference is removed, it can take about 1-2 weeks for the symptoms to fully resolve. 
If it is root surface exposure causing the sensitivity, you can get MI Paste from a dental office which has minerals to help stop your symptoms and protect the tooth. 

If the sensitivity is improving with sensodyne, likely the tooth will get better on its own with time. Sensodyne is great but MI paste is even better for sensitivity, in my opinion. MI paste is available at the dentist's office only. If the sensitivity does not improve after using MI paste OR if you feel like you cannot tolerate the sensitivity and wait for it to get better on its own, you may want to consider seeing an endodontist to have them evaluate for fractures in the tooth or irreversible pulp damage that may not get better on its own. Hope this helps!

Hi there,
I would have the bite checked to make sure that there aren't actually any interferences in the bite that can irritate the nerve of the tooth.  Because you said that sensodyne seems to be helping, it is most likely a little bit of recession with exposed root that's causing the problem.  In my office I like to use a material called MI paste (GC America) that can really help with sensitivities like this one.  
Good luck!