Root canal and crown

Hi, i had a root canal done in August 2011, and have been still having pain on same tooth. So endodontist took x-ray and found there was bacteria in there, so had another root canal to remove that, I am still in throbbing pain and soreness,went back to dentist last night and he wasn't sure what was the matter,he put me on antibiotics, and they also want to put a temporary crown on, will this help, why would they want to do that.Will it help with the pain I'm having, what is the difference between a temporary and permanent crown.Don't really know what else to do, thanks for the information. Would appreciate a quick answer as I have my appt. booked asap.

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