Most likely what you are experiencing is inflammation in your temporal mandibular joint (TMJ
) from the injection you were given to numb the lower teeth. This happens quit often when anesthetizing for lower teeth causing pain when opening. If you are having pain in the tooth that has a temporary crown, then the bite may need to be adjusted. If that tooth is not adjusted correctly, then it will become very sore to chew. However, this would not be related to your pain you are having when opening. I recommend to my patients to take an over the counter ibuprofen
for a couple of day. As long as they are not allergic. Also, warm compresses on the joint area will alleviate some of the discomfort as well.