Why am I still having occasional pain after root canal and crown?

You should ask your dentist to take a new x-ray.  Soreness to a tooth can be from a variety of different reasons:1. Occlusion is still high. Radiograph may show a widened ligament space around the tooth2. Root canal did not properly seal the tooth.  ie. Accessory canal, incomplete fill of canal, ect.3. Cracked tooth.  If the crack is large enough, then the radiograph will show bone loss around the crack4. Make sure that you do not rule out muscle irritations.  The muscle of mastication can be inflamed5. Referred pain.  The sore tooth could be a different toothAs you can tell, there could be more than one reason for your continued sensitivities.  Hope this helps.

Hello and thank you for your question.
Sounds like something, which needs to be checked out by a doctor. It could be that the bite even though it feels better is still high and interfering when you grind your teeth left to right and forward. It is also possible you might be a clentcher or a grinder. In that case, you are putting a lot more pressure in the area of the new crown. A night guard  (dental appliance to releave the bite) might be recommended.My advise is to see a doctor. Good luck.

Depending on the size of the infection, root canal teeth can take up to 9
months to completely heal. If you are feeling pain only to biting (not
to hot or cold) most likely the nerve is completely removed and that is
not the issue. However there are nerves in the tissue below the tooth.
This is what can take longer to heal and be causing you the discomfort
to biting. The most conservative option should be taken first which is
to give the tooth time. If in a few more months the tooth does not feel
better, there is likely a crack in the tooth. If this is the case
unfortunately the only option would be removal and replacement with a
bridge or implant. In the mean time ask your dentist to take the tooth
completely out of contact when you bite down. This will take pressure
off the tissue below the tooth and give it a better chance to heal. Good
luck.

You had your root canal treatment completed in November and this is March.  That is roughly a five month span.  It is usual to think that you would not have pain by now.  Causes of pain could include:  a. Untreated canal / lateral canal in the tooth root - occasionally there are more that one canal in a tooth. They are hard to detect and if a lateral canal impossible to treat (lateral canal is generally at right angles to the main canal.)  b.  Large initial lesion that is just taking time to heal completely.  Treatment here:  don't bite on it, give tooth more time and let it heal.  Treat it like you would a sprained ankle - stay off it until completely healed.   c.  Bite still high.  Treatment:  see your dentist, have him adjust again and then stay off biting on that side for a while.  d.  Other problem not diagnosed/treated:  root fracture, periodontal disease, stretched periodontal ligament (ligament that holds the tooth in) , opposing tooth acting up. Talk to your dentist and / or root canal specialist who did the root canal about these issues.  Good luck!  I know it took my own tooth 9 months to heal from a deep filling.  I just stayed off it, treated it like a sprained ankle and then one day I realized I was chewing on it and voila' it was healed.