Continuos Pain at Implant Site: Any Ideas?
I placed an implant on #13 [maxillary left second premolar; 25] about a year ago without any complications.  The implant appeared to be fully integrated without any signs of disease.  The abutment screw is torqued down completely and is as solid as a rock.  Radiographically all signs are normal.  But as soon as I inserted the prosthetic component, the patient start complaining of pain at the site of the implant. Distance from the implant to sinus is 2-2.5mm. There is no evidence of intraoral swelling or erythema at the implant site and no inflammation. There is impingement on the gingiva and the occlusion had been relieved. I removed the crown and replace it with the healing cap.  Any ideas on what is causing the pain and what I can do to alleviate the problem?