Abstract: Objective: To explore the application of immediate implant placement in root canal therapy failure cases. Methods: 64 patients who came from January 2014 to December 2017 were selected. After root canal treatment failed, 66 implants were implanted. The 32 implants were implanted by immediate implant method, and 34 implants were implanted routinely at least three months after extraction as control group. The 1-year survival rate, peri-implant plaque index(PLI), modified peri-implant hemorrhage index(mBI) and probing depth(PD) of the two groups were compared. The data were analyzed by PASW statistic 20.0 software. Result: The 1-year survival rate of weight-bearing in the two groups was 100%. There was no significant difference in PLI, mBI and PD around implants between the two groups. Conclusion: For root canal treatment failure cases, immediate implant is a feasible way of restoration.

Key words: root canal therapy, failure, immediate implant placement, feasible