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Stresses induced by different loadings around weak abutments
1Department of Prosthodontics, University of Ankara, Faculty of Dentistry, Turkey.
The Journal of Prosthetic Dentistry
|December 1, 1992
Summary
This study analyzed stresses on dental implants under various forces. A distributed force caused the most critical stress on the alveolar bone, especially with reduced bone support.
Area of Science:
- Biomaterials Science
- Biomechanics
- Dental Implantology
Background:
- Fixed partial dentures (FPDs) are common dental restorations.
- Understanding abutment stresses is crucial for FPD longevity.
- Finite element analysis (FEA) is a valuable tool for biomechanical evaluation.
Purpose of the Study:
- To analyze stresses and deflections in abutments under different loading conditions.
- To evaluate the impact of varying alveolar bone levels on these stresses.
- To identify critical loading scenarios for mandibular posterior three-unit FPDs.
Main Methods:
- A two-dimensional finite element model was used.
- Simulated four loading types: distributed force, concentrated axial, and nonaxial forces.
- Analyzed three different alveolar bone levels.
Main Results:
- The premolar abutment experienced greater pressure than the molar abutment under most occlusal loads.
- Distributed forces induced the most critical stresses in the alveolar bone.
- Diminishing periodontal support significantly elevated stresses, particularly under concentrated nonaxial loads on the molar.
Conclusions:
- The type of occlusal loading significantly influences abutment stress distribution.
- Reduced alveolar bone levels exacerbate stresses, increasing the risk of biomechanical failure.
- Nonaxial forces on molar abutments are particularly detrimental with compromised bone support.