Abstract: Objective: To analyze the etiology of periapical periodontitis of implant and summarize the experience of treatment. Methods: One female patient was complicated with periapical periodontitis after immediate implantation of maxillary anterior teeth. The implant was removed and strict debridement irrigation was carried out. Iodoform gelatin sponge and platelet-rich fibrin were implanted in the implant fossa, and the implant was delayed. Observation of clinical repair effect. Results: The X-ray film showed that there was new bone formation in the bone defect, the transmission shadow disappeared and the graft was stable, and the repair effect was satisfactory. Conclusion: After the extraction of periapical teeth, there are residual granulation tissue and inflammatory scar tissue in the extraction fossa. It is necessary to scrape off the granulation tissue and infection, otherwise, it is easy to cause the failure of implantation due to the residual bacteria in the planting area. The choice of planting time and the application of antibiotics before and after implantation are also the key factors for successful implantation.

Key words: implant periarthritis, planting, treatment, prevention