tooth still hurts under new crown after 2 months?

I am afraid that if your pain took this long then it could probably indicate that there is a problem,

this problem could be the result of over extended margins, or if the pulp was not extracted it could indicate that the heat applied was over the limit, or sometimes it could indicates that there is extra cement (the adhesion of the crown) probably GI or zinc phosphate leaked under the gums. I would strongly recommend you to go to a dentist, it could be normal to have mild sensitivity after placing of the crown and this pain may remain for about two ot 3 months maximum, but the functional pain or the pain that you feel with bite shouldnt last for more than few days,

Hi Dave F is right, you need an xray to see if all the canals have been filled, and to the correct length, other wise there is residual infection, this requires antibiotics to clear up, the bite needs to be taken out of occlusion to prevent any further trauma, if the tooth does not settle after all this has been addressed you probably will need an root resection, or removal of the tooth, get the dentist to check all is ok, it is still there problem. Take care

I would visit a dentist that is highly trained and has training in bite evaluation (someone who is a prosthodontist http://www.top3dentists.com/pages/prosthodontal or someone who has had training in Full Mouth Rejuvenation). This could be due to a bad bite, a crack on the tooth that is too deep, or improper techniques. Either way, a properly trained dentist would be able to help you with that.