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Volume 14 , Issue 3
May/June 1999

Pages 337–341

Numerical Analysis of a Dental Implant System Preloaded with a Washer

Antheunis Versluis, PhD Assistant Professor, Tom W. P. Korioth, DDS, PhD Assistant Professor, Antonio C. Cardoso, DDS, MS, PhD

PMID: 10379106

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. (Int J Oral Maxillofac Implants 1999;14:337–341) Key words: dental implant, finite element analysis, screw loosening, stiffness, washer

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