Retrograde peri-implantitis: evaluation and treatment protocols of a rare lesion.

Objective: Retrograde peri-implantitis (RPI) is defined as bone loss around an osseointegrated implant apex that usually appears within the first few months of its placement. This retrospective study aimed to evaluate the relationships between RPI and demographic factors, local bone and intraoral factors, and implant and surgery-related factors.

Method And Materials: A retrospective study was conducted in 116 patients with a total of 369 implants placed between January and June 2019.