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Volume 38 , Issue 4
July/August 2018
Pages 489–493

A 13- to 32-Year Retrospective Study of Bone Stability for Machined Dental Implants

Massimo Simion, MD, DDS/Myron Nevins, DDS/Giulio Rasperini, DDS/Francesco Tironi, DDS

PMID: 29889912
DOI: 10.11607/prd.3694

The goal of this retrospective investigation was to provide evidence of the longevity of machine-surfaced implants placed in native bone and treated with the original two-stage surgical protocol. The observation times of this study covered periods of 13 to 32 years. Consecutive cases were impossible; the patients’ ages when treated reduced the number of available people as a result of death, relocation, being impossible to find, or refusal to cooperate. Mean marginal bone loss after 13 to 32 years was 1.9 ± 0.9 mm, survival rate was 97.7%, and success rate was 92.7%. Peri-implantitis occurred in a limited number of cases, with a prevalence of 1.8%. This study demonstrates long-term reliability of machined implants as a therapeutic choice.

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