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An Evaluation of New Designs in Implant-Abutment Connections: A Finite Element Method Assessment

Covani, Ugo MD, DDS*; Ricci, Massimiliano DDS, PhD; Tonelli, Paolo DDS, MD; Barone, Antonio DDS, PhD, MSc§

Implant Dentistry:
doi: 10.1097/ID.0b013e318292625f
Basic and Clinical Research

Purpose: This research sought first to evaluate the differences in the finite element method (FEM) analysis of 4 different implant surfaces, including internal and external connections of the same manufacturer with additional modifications.

Methods: In this study, 4 dental implants from the same manufacturer were compared. A connection system was modified with a collar to improve its stability. A nonlinear dynamic analysis by FEM was used to calculate the transient response of the dental implant systems.

Results: The results of FEM analysis indicated that the implant-modified configuration is more efficient in loading support when compared with the others.

Conclusion: In the present research, 4 different types of connections were evaluated: a modified internal hex connection with a collar (to increase stability), an internal hex connection, a standard connection without hex, and an external connection. These data demonstrated that the internal hex connection with the modification of the manufacturer's original is much more resistant to loosening and/or distortion than the traditional hex.

Author Information

*Full Professor, Department of Surgery, University of Pisa, Italy; Istituto Stomatologico Tirreno, Versilia Hospital, Lido di Camaiore, Lucca, Italy.

Senior Fellow, Department of Dentistry, Istituto Stomatologico Tirreno, Versilia Hospital, Lido di Camaiore, Lucca, Italy.

Full Professor, Department of Dentistry and Oral Surgery, University of Florence, Florence, Italy.

§Assistant Professor, Department of Surgery, University of Pisa, Pisa, Italy.

Reprint requests and correspondence to: Massimiliano Ricci, DDS, PhD, Istituto Stomatologico Tirreno, Ospedale della Versilia, Via Aurelia 335, Lido di Camaiore, Lucca, Italy 55041, Phone: +39-0584-6059888, Fax: 05846059889, E-mail:

© 2013 by Lippincott Williams & Wilkins, Inc.