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BioMed Research International
Volume 2017, Article ID 8017175, 16 pages
Research Article

Tapered, Double-Lead Threads Single Implants Placed in Fresh Extraction Sockets and Healed Sites of the Posterior Jaws: A Multicenter Randomized Controlled Trial with 1 to 3 Years of Follow-Up

1Department of Biomedical and Neuromotor Sciences (DIBINEM), University of Bologna, 40126 Bologna, Italy
2Department of Surgical and Morphological Science, University of Insubria, 21100 Varese, Italy
3Private Practice, 50129 Firenze, Italy
4Private Practice, 20122 Milano, Italy
5Private Practice, 44121 Ferrara, Italy
6Department of Diagnostic and Surgical Science, University of Genoa, 16126 Genoa, Italy
7Private Practice, 37126 Verona, Italy
8Private Practice, 46035 Mantova, Italy

Correspondence should be addressed to Alessandro Cucchi; moc.liamtoh@ihccuc.rd

Received 15 May 2017; Accepted 31 July 2017; Published 13 September 2017

Academic Editor: Hassan Maghaireh

Copyright © 2017 Alessandro Cucchi et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


Purpose. To evaluate the survival, success, and complication rates of tapered double-lead threads single implants, placed in fresh extraction sockets and healed sites of the posterior jaws. Methods. The enrolled patients were randomly divided into 2 groups: in the test group (TG), all implants were inserted at the time of tooth extraction; in the control group (CG), all implants were placed 3 months after extraction. The implants were followed for a period of 1 to 3 years after loading. The main outcomes were implant survival, complications, and implant-crown success. Results. Ninety-two patients had 97 installed implants (49 in the TG, 48 in the CG). Only two implants failed, in the TG; the survival rates were therefore 95.9% (47/49) and 100% (48/48) for TG and CG, respectively. In the surviving implants, no complications were reported, for an implant-crown success of 100%. Conclusions. Although a significant difference was found in the levels of primary stability between TG and CG, single implants placed in fresh extraction sockets and healed sites of the posterior jaws had similar survival and complication rates. Crestal bone levels and peri-implant bone resorption showed similar values. A longer follow-up period is however required, to confirm these positive outcomes.