Displacement of dental implants into the focal osteoporotic bone marrow defect: a report of three cases
A 60-year-old woman with medical history of hypertension was referred by another department of our dental center for the management of displacement of implant fixture in the left mandible posterior area on July 16, 2012. Thirty minutes earlier, one implant accidentally fell into the mandible body of the #36 area during implant surgery.() Note, however, that the #37 implant (4.5 mm wide, 8.0 mm long) placed simultaneously with #36 had good initial stability. CBCT imaging of the jaws showed radiolucency with quite ill-defined and irregular borders located from the premolar area to the left midbody of the #36, #37 edentulous regions and indicated the implant location to be near the mandibular canal.() The removal of implant fixture followed the same procedure as that of case 1. The implant was 4.5 mm wide and 10.0 mm long.() Three months later, replacement of the #36 implant (4.0 mm wide, 10 mm long) was performed with autogenic and xenogenic bone graft.() Bone grafts were made on the upper third portion of the implant. It had three-walled defects, but primary stability was sufficient. Six months after the #37 implant placement and three months after the #36 implant replacement, secondary surgery was performed, followed by the delivery of prosthetics; healing proceeded uneventfully without any postoperative complication.