Welcome to Justanswer.com. I am an Emergency physician with over 25 years multi-disciplinary experience. I am going to be your expert in this question.
However, I would like a few more information from you to help streamline your answer
The temporomandibular joint TMJ is just close by and fits the description that you gave. TMJ dysfunction. All the other possibilities would have shown physical signs like redness etc
However, the original injury may be just at the gum/dental socket, but the proximal relationship of the TMJ makes it vulnerable in an incident as you described.
irrespective of what structures involved, the treatment would involve just treatment with NSAIDs like Naproxene and being cautious with chewing on that side till it heals.
However, if symptoms persist, then you may need to go to the dentist for possible x-ray
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