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The Scientific World Journal
Volume 2014 (2014), Article ID 357074, 8 pages
http://dx.doi.org/10.1155/2014/357074
Research Article

Laser Welded versus Resistance Spot Welded Bone Implants: Analysis of the Thermal Increase and Strength

1Sezione di Odontostomatologia, Azienda Ospedaliero, Universitaria di Parma, Via A. Gramsci 14, 43100 Parma, Italy
2Laser Unit, Dental Department, Faculty of Medicine, University of Liege, Belgium

Received 29 March 2014; Accepted 18 June 2014; Published 3 July 2014

Academic Editor: Dennis Flanagan

Copyright © 2014 Carlo Fornaini 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.

Abstract

Introduction. The first aim of this “ex vivo split mouth” study was to compare the thermal elevation during the welding process of titanium bars to titanium implants inserted in pig jaws by a thermal camera and two thermocouples. The second aim was to compare the strength of the joints by a traction test with a dynamometer. Materials and Methods. Six pigs’ jaws were used and three implants were placed on each side of them for a total of 36 fixtures. Twelve bars were connected to the abutments (each bar on three implants) by using, on one side, laser welding and, on the other, resistance spot welding. Temperature variations were recorded by thermocouples and by thermal camera while the strength of the welded joint was analyzed by a traction test. Results. For increasing temperature, means were 36.83 and 37.06, standard deviations 1.234 and 1.187, and value 0.5763 (not significant). For traction test, means were 195.5 and 159.4, standard deviations 2.00 and 2.254, and value 0.0001 (very significant). Conclusion. Laser welding was demonstrated to be able to connect titanium implant abutments without the risk of thermal increase into the bone and with good results in terms of mechanical strength.