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The International Journal of Oral & Maxillofacial Implants



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Int J Oral Maxillofac Implants 18 (2003), No. 3     15. May 2003
Int J Oral Maxillofac Implants 18 (2003), No. 3  (15.05.2003)

Page 417-423

A Prospective Multicenter Clinical Trial of 3i Machined-Surface Implants: Results After 6 Years of Follow-up
Weng, Dietmar / Jacobson, Zhimon / Tarnow, Dennis P. / Hürzeler, Markus B. / Faehn, Ove / Sanavi, Farshid / Barkvoll, Pål / Stach, Renée M.
Purpose: In this prospective multicenter clinical study, 1,179 3i standard threaded and self-tapping implants were followed for up to 6 years and monitored according to established success criteria.
Materials and Methods: A total of 493 patients (240 men and 253 women) with a mean age of 45.1 years at implant surgery were enrolled at 6 research centers after being screened for exclusion criteria. Implants were placed according to a 2-stage surgical protocol with a minimum of 4 months of submerged healing in the mandible and 6 months in the maxilla. Restorations included 633 prostheses, the majority of which were fixed partial dentures in the posterior mandible or maxilla or single-tooth replacements in the anterior maxilla.
Results: One hundred four implants (8.8%) did not meet success criteria and were designated as failures, and 222 implants (18.8%) were lost to follow-up. The cumulative success rate according to life table methods was 91.1% at 6 years.
Discussion: Sixty percent of the failed implants were short (<= 10 mm long), and their cumulative success rate as a group at 6 years was 89.0%, compared to 93.1% for longer implants (P < .05). Thirty-three percent of all failures were implants placed in the posterior maxilla, for a 5-year cumulative success rate of 87.4%.
Conclusion: It appears that limited bone dimensions and poor-quality bone have an impact on the performance of these machined-surface implants.