Objective: To evaluate the long-term performance of machined screw implants placed in partially edentulous patients. Method and Materials: Eighty-six patients received a total of 214 machined implants (3i Implant Innovations). Seventy-six patients received 112 crowns and fixed partial dentures. The implants were placed in both the maxilla and the mandible. Using standardized radiographs, the peri-implant bone level was evaluated at the time of delivery of the final restorations and at up to 8 follow-up examinations. Results: Nine implants failed before and 6 implants during functional loading. Further, 30 implants were classified as biologically unsuccessful. The estimated survival rate of the implants was 93% after 84 months (confidence interval 88% to 97%). The estimated success rate was 83.3% after 84 months (confidence interval 76.4% to 90.2%). Conclusion: Machined 3i implants can be used for the replacement of missing teeth in partially edentulous patients. (Quintessence Int 2007;38:643–651)

Key words:dental implants, fixed partial dentures, partial edentulism, survival rate, success rate