Materials and Methods: one hundred patients who were treated by 300 implants supported fixed partial prosthesis with and without cantilever after at least three years of treatment, were evaluated. Clinical and radiographic indices of plaque index, probing pocket depth, bleeding index and marginal bone loss were measured. Collected data were analyzed by Mann-Whitney, Fridman and repeated-measures ANOVA tests using SPSS software.

Results: The overall survival rate of implant supported prosthesis was 95.9% after at least three years of treatment. The success rates of implant supported fixed prosthesis with and without cantilever were 94.6% and 96.8% respectively. Marginal bone loss in the cantilevered fixed prosthesis was significantly more than the second group after two and four years of treatment (P<0.001), however, all the clinical indices were not significantly different.

Conclusion: Considering the guidelines of cantilever prosthesis applications, using the cantilevered fixed partial dentures have a similar and comparable prognosis as the traditional implant-supported fixed prostheses.