The implant periapical lesion: four case reports and review of the literature.

Postoperative complications have been identified with implant failure in conjunction with the increased use of root-type implant restorations. The failure of osseointegrated dental implants primarily occurs as a result of peri-implantitis and occlusal overload. Less frequently reported failures, however, have been attributed to implant periapical lesions. The etiology and treatment modalities for such lesions have been speculated throughout the literature. This article discusses possible etiologies of and treatment for implant periapical lesions based on the existing literature and four case reports.