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Volume 7 , Issue 2
Summer 1992

Pages 185-194


Three-Dimensional Force Measurements on Mandibular Implants Supporting Overdentures

Regina Mericske-Stern, Dr Med Dent/Alfred H. Geering, Prof Dr Med Dent/ Walter B. Bürgin, Dipl Ing ETH/Hans Graf, Prof Dr Med Dent


PMID: 1398835

The purpose of this study was to determine masticatory and functional forces in three axes on mandibular implants supporting overdentures. Five edentulous test subjects were selected, each having two mandibular implants. Three-dimensional piezoelectric force transducers were mounted on the two-part ITI Bonefit implants and rigidly connected to the denture. Forces in vertical, lateromedial, and anteroposterior directions were measured by means of electrostatic plotter records. The test modalities were light tapping, grinding, maximal occlusal force, and chewing test food. Results showed that the five subjects developed similar stress patterns but quantitatively different occlusal and chewing forces. In all but one subject, reduced maximal occlusal force was found compared to dentate subjects and edentulous subjects with fixed partial prostheses supported by implants. The recordings of chewing cycles when eating test food resulted in very regular rhythmic strokes, similar to those of dentate subjects but with slightly reduced speed. All stress patterns showed that occlusal and chewing forces were mainly directed in vertical, medial, and anterior dimensions. The dominating component was vertical. (INT J ORAL MAXILLOFAC IMPLANTS 1992;7: 185-194.)

Key words: chewing force, implants, occlusal force, overdentures, three-dimensional measurement


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