Ricerc@Sapienza

Aims: Periapical implant lesions, also named apical peri-implantitis or retrograde peri-implantitis, were described since 1992, and are characterized by progressive bone loss at the periapex of the implant. Several case reports have suggested these lesions are possible causes for early implant failure. The aim of this article was to review the Literature to identify current knowledge on surgical management of acute retrograde peri-implantitis.

Abstract
Background: Retrograde peri-implantitis (RPI) is a pathological entity with an unclear etiology (e.g., overheating during implant insertion, residual infection of the tooth replaced by the implant or the endodontic lesion of neighboring teeth) and an extremely low prevalence and has been scarcely investigated. Therefore, the aim of this cross-sectional survey was to evaluate the knowledge and attitude of Italian implantologists regarding RPI.

Retrograde peri-implantitis is a symptomatic complication, characterised by radiographic detection of bone loss at the periapex of the implant. The aim of this study was to investigate the possible endodontic aetiology, evaluating the effectiveness of surgical treatment without endodontic therapy of adjacent teeth. In the 10-year interval, three patients reported symptoms of retrograde peri-implantitis after a mean period of 30.6 days from implant placement. Mean follow-up after surgical procedures was 8.66 years, with an implant survival of 100%.