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The International Journal of Oral & Maxillofacial Implants



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Int J Oral Maxillofac Implants 27 (2012), No. 2     15. Mar. 2012
Int J Oral Maxillofac Implants 27 (2012), No. 2  (15.03.2012)

Page 458-466, PubMed:22442788

Three-Year Prospective Multicenter Study Evaluating Marginal Bone Levels and Soft Tissue Health Around a One-Piece Implant System
Finne, Kaj / Rompen, Eric / Toljanic, Joseph
Purpose: The aim of this clinical investigation was to evaluate marginal bone remodeling and soft tissue health surrounding a novel one-piece implant system over a 3-year study period.
Materials and Methods: Subjects missing at least one tooth in either arch were consecutively enrolled in this open prospective 3-year investigation. Five clinics were invited to participate. Strict inclusion and exclusion criteria were used. Marginal bone levels were evaluated using radiographs taken at implant insertion, 6 months, and annually thereafter. Plaque and bleeding indices were recorded at 3 and 6 months and 1 and 3 years following implant insertion. The shapes of papillae were evaluated at implant insertion with the provisional restoration in place, at the insertion of the definitive restoration, and at the 3-year follow-up, using Jemt's papilla index. Life tables and the Mann-Whitney U test were used for statistical analyses.
Results: Fifty-six patients were restored with a total of 82 one-piece implants; 47 patients attended the 3-year appointment. One implant had to be removed 1 month postinsertion, giving a cumulative survival rate of 98.8% for the 3-year study period. Most bone resorption (mean, 1.19 ± 1.38 mm; n = 61) occurred during the first year of function, while there was minimal change in mean marginal bone levels between 1 and 3 years (-0.07 ± 1.07 mm; n = 58). Normal peri-implant mucosa was registered for more than 81% of the sites, and no visible plaque was registered for more than 54% of the sites.
Conclusion: This prospective 3-year multicenter study showed stable marginal bone levels, good soft tissue health, and a high implant survival rate, supporting the hypothesis that the presented one-piece implant system has the capacity to maintain both hard and soft tissues after the first year of initial bone remodeling.

Keywords: bone level, immediate function, one-piece dental implants, soft tissue