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On functional strain in fixed and removable partial dentures. An experimental in vivo study
1Department of Prosthetic Dentistry, Faculty of Odontology, Lund University, Malmö, Sweden.
Acta Odontologica Scandinavica
|December 1, 1993
Summary
This study investigated the functional deformation of a combined dental reconstruction. While complex forces were observed, the removable partial denture (RPD) appeared to distribute chewing forces more favorably across the fixed bridge.
Area of Science:
- Biomaterials Science
- Dental Mechanics
- Prosthodontics
Background:
- Understanding the biomechanical behavior of combined fixed-prosthodontic and removable partial denture (RPD) restorations is crucial for long-term success.
- Maxillary bridges and RPDs experience complex stress patterns during mastication, potentially impacting the supporting structures and the restorations themselves.
Purpose of the Study:
- To analyze the functional deformation patterns of a fixed bilateral cantilevered crossarch maxillary bridge.
- To evaluate the influence of an attachment-retained removable partial denture (RPD) on the stress distribution within the fixed reconstruction during occlusal loading.
Main Methods:
- Three rosette strain gauges were affixed to a fixed bilateral cantilevered crossarch maxillary bridge.
- One linear strain gauge was attached to an attachment-retained RPD.
- Deformation was measured under maximum habitual biting and maximum unilateral loading conditions.
Main Results:
- Complex deformation patterns, including elongation and contraction, were observed in the fixed reconstruction under various loading conditions.
- These complex deformations occurred both with and without the RPD in place.
- The incorporation of the RPD resulted in a more even and favorable distribution of masticatory forces within the fixed reconstruction.
Conclusions:
- The functional deformation of combined maxillary bridge and RPD restorations is intricate.
- Attachment-retained RPDs may play a beneficial role in optimizing stress distribution for fixed crossarch reconstructions, potentially enhancing their longevity and performance.