Purpose: The purpose of this paper is to present a survival analysis of 133 consecutively placed moderately rough implants, all with a total follow up of 20 years.
Materials and methods: A total of 133 implants of the same brand placed in 46 patients at the same county clinic of Sweden have been followed up prospectively over 20 years and analyzed for survival and bone height, the latter evaluated in peri-apical radiographs.
Results: A total of 7 implants failed, of which 4 failures were seen in the same patient. The reason for implant failure was associated with a combination of patient smoking and bruxing in 5 of the 7 failed cases. A 20- year survival rate of 94.7% was observed. Average marginal bone loss(mbl) at 20 years of follow up was 0.543 ±1.193 mm with 9 implants having more than 2 mm mbl . A total of 20 patients with 25 implants dropped out of the study, but if patient death as drop-out reason is ignored only 3 implants in 3 patients were unaccounted for.
Conclusion: Good clinical results in the 95% survival range were observed with moderately rough implants over a 20 year follow up time.