Abscess formation around the apex of a maxillary root form implant: clinical and microscopical aspects. A case report.

This case report describes the occurrence of an abscess in the periapical area of a root form maxillary titanium implant, with a radiolucent appearance and purulent discharge. The removal of the infected periapical tissues was carried out but the clinical symptoms of infection persisted, an attempt at guided tissue regeneration with a freeze-dried dura mater membrane notwithstanding, and it was necessary to remove the implant. The microscopical examination showed that it was possible to observe nonviable bone tissue, with absence of bone cells and areas of bone resorption in the apical portion of the implant. These microscopical features were compatible with an acute localized suppurative osteomyelitis.