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The International Journal of Oral & Maxillofacial Implants



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Int J Oral Maxillofac Implants 14 (1999), No. 3     15. June 1999
Int J Oral Maxillofac Implants 14 (1999), No. 3  (15.06.1999)

Page 337-341

Numerical Analysis of a Dental Implant System Preloaded with a Washer
Versluis, Antheunis / Korioth, Tom W. P. / Cardoso, Antonio C.
Gold screw loosening is a problem that frequently affects dental implants. The application of a preload has been the main means of preventing loosening. However, this measure has not been able to eliminate its occurrence. In this study the effect of a washer in a Brånemark-type implant on the loosening conditions of the retaining screw was investigated using a finite element simulation. The simulation indicated that a washer may significantly increase the tolerance of a screw against loosening. This is accomplished by increasing the tolerance of the implant against deformation. The addition of a customized washer to a dental implant system may offer a very simple and inexpensive solution for the persistent problem of screw loosening.

Keywords: dental implant, finite element analysis, screw loosening, stiffness, washer