Abstract: Objective To study and analyse the differences of risk factors between early and late failures of implants, in order to guide the preoperative preparation and postoperative maintenance of implant and improve the implants survival rate. Methods A total of 177 cases of implant failure among 7334 patients who underwent implant restoration in Hefei Stomatological Hospital from January 2011 to December 2018 were collected. According to the time of failure, cases were divided into early failure group and late failure group. The related risk factors that may affect the failure of planting were analyzed respectively, and the difference between the two groups of data were analyzed. Results There were significant differences between early implant failure and late implant failure in factors of gender, implant site, implant size and bone substitute. The female patients, with implants in anterior region or with bone substitute are more likely to fail early, while the male patients in posterior region are more likely to fail late. Conclusion The improved preoperative assessment and preventive treatment of risk factors can effectively reduce the early failure rate of implant. Regular follow-up, control of risk factors and timely maintenance would effectively prevent the late failure of implan.

Key words: Implant, Early failure, Late failure, Implant maintenance