Abstract: Objective： To observe the clinical effects of failed implant re-implantation, and to supplement the current treatment methods for failed implants. Methods： A retrospective analysis of 9 cases of patients im- planted in the Stomatology Hospital of Southern Medical University from February 2008 to June 2014, 8 cases of Straumann Standard 4.1×10mm implants, 1 case of Osstem SSII 4.1×11.5mm implants. The im- plant was implanted and restored for more than 1 year. The implant was obviously loose and painful when chewing, but the implant was not exposed, the soft tissue was not obviously red and swollen, and there was no obvious pyorrhea of the implant. X-rays shown Implant low density, but no significant horizontal and vertical bone defect image. Perform a failed implant replantation procedure under local anesthesia, the failed implants were washed with saline and the carbon fiber head scraper was used to clean the infected bone and fibrous tissue remaining on the implant surface. The bone defect was partially filled with Tianbo bone powder or Bio-Oss bone powder. Results： Nine of the loose dental implants were repaired for more than 1 year. The shortest use time was 4.5 years after implant restoration, the longest was 9 years, and the average service life was 6.5 years. 8 of the 9 replanted implants were repaired after 3 to 6 months, and on- ly 1 did not have osseointegration. New implants were implanted after removal, and repairs were complet- ed 3 months later. All torque values reached 35 Ncm. X-ray photos examined no low-density images around the implant. Conclusion： Replantation of failed dental implants can also achieve osseointegration and function. Some failed implants should not be simply discarded, and can be re-successed through reimplantation. Enriching the existing knowledge of the failure of dental implant treatment.

Key words: dental implant, re-implantation, failure