2013 年 26 巻 1 号 p. 30-36
Aim: We report a case in which new bone formed after removal of grafted material due to postoperative infection in an augmented maxillary sinus floor. Patient: The patient was a 62-year-old female who had suffered from denture incompatibility for several years. She had undergone a procedure to augment the sinus floor with a 1:1 mixture of Ceraform ® and autologous bone. We diagnosed that the graft was infected 1 month after surgery. We removed a part of the graft material through a lateral window surgical procedure. Consequently, the postoperative infection and inflammation were controlled. Seven months after the surgery to control the infection, cone-beam computed tomography (CBCT) images showed that the density in the cavity had increased. We biopsied the ossified tissue inside the augmented site, and placed implant bodies at the sites of #26 and #27. The biopsy specimen showed that new bone had formed and that the new bone was composed of lamellar bone (31.6%), residual HA particles (10.4%), and connective tissue. As of 4 years after placing the implant bodies, there continue to be no signs of implant failure. Conclusion: In the present case, the space under the dome of the closed cavity gradually filled with new bone growth, while the sinus membrane lying on the dome was undisturbed. We suggest that promoting new bone growth to fill such void spaces can be a useful therapeutic strategy.