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Three-dimensional force measurements on mandibular implants supporting overdentures.

R Mericske-Stern¹, A H Geering, W B Burgin

¹School of Dental Medicine, University of Bern, Switzerland.

The International Journal of Oral & Maxillofacial Implants

|January 1, 1992

Summary

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Mandibular implants supporting overdentures experience functional forces primarily in vertical, medial, and anterior directions. Maximal occlusal force was reduced compared to other implant-supported prostheses.

Area of Science:

Biomaterials Science
Biomechanics
Dental Implantology

Background:

Edentulism affects masticatory function and force distribution.
Mandibular overdentures supported by implants aim to restore function.
Understanding forces on implants is crucial for long-term success.

Purpose of the Study:

To quantify three-dimensional forces on mandibular implants supporting overdentures.
To analyze force patterns during various masticatory tasks.

Main Methods:

Five edentulous subjects with two-implant-supported mandibular overdentures participated.
Three-dimensional piezoelectric force transducers measured forces in vertical, lateromedial, and anteroposterior axes.
Data collected during light tapping, grinding, maximal occlusal force, and chewing tests.

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Main Results:

Subjects exhibited similar force patterns but varied quantitatively.
Maximal occlusal forces were generally lower than in dentate subjects or those with fixed implant prostheses.
Chewing forces showed regular, rhythmic patterns, comparable to dentate subjects but slower.
Dominant force components were vertical, medial, and anterior.

Conclusions:

Mandibular implant-supported overdentures experience predictable force vectors.
Reduced maximal occlusal force may be a factor in implant-supported overdenture function.
Further research is needed to optimize implant design and patient outcomes.