Chronic pain in that area of the jawbone after removal of the implant could be associated with a number of things. It could be due to a good sized opening into the sinus that has not closed,with or without infection into the sinus.A piece of the front portion of the bone called the buccal plate could be fractured and displaced and it could be a small piece.It could also be a bacterial infection called osteonecrosis or osteomyelitis.
It would be a good idea to have a 3D dental CT scan of that area when you can get back to your dentist,if you haven't already had one. Lingering pain from the dental work that you've had done is not normal.It indicates something is going on. It may be a minor issue that will heal on it's own,but it would be good to check into it further.For more info on implants,visit the link http://www.identalhub.com/article_factors-affecting-long-term-implant-success-174.aspx
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