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Mechanical performance of a dental composite: probabilistic failure prediction
P G van der Varst1, W A Brekelmans, J H de Vree
1Department of Cariology & Endodontology, TRIKON (Institute for Dental Clinical Research), University of Nijmegen, The Netherlands.
Journal of Dental Research
|August 1, 1993
Summary
Predicting dental composite failure requires a probabilistic approach. The Drücker-Prager equivalent stress model accurately predicted the mechanical failure load of dental composites with less than 8% error.
Area of Science:
- Materials Science
- Biomaterials Engineering
- Mechanical Engineering
Background:
- Mechanical performance of dental composites is crucial for clinical success.
- Composite materials exhibit probabilistic behavior due to their brittle nature.
- Predicting mechanical failure necessitates a probabilistic approach and appropriate equivalent stress definitions.
Purpose of the Study:
- To investigate the predictive capacity of two equivalent stress definitions for microfine composites.
- To determine the most suitable equivalent stress for probabilistic failure analysis of dental composites.
- To assess the accuracy of the Drücker-Prager and Modified von Mises models.
Main Methods:
- Probabilistic analysis of composite material strength.
- Application and comparison of Drücker-Prager and Modified von Mises equivalent stress definitions.
- Experimental testing of notched beams made from microfine composite.
Main Results:
- The Drücker-Prager equivalent stress demonstrated superior predictive capacity.
- The Drücker-Prager model predicted the average failure load of notched beams with an error below 8%.
- Significant differences in tensile and compressive strengths of composites were considered.
Conclusions:
- The Drücker-Prager equivalent stress is recommended for probabilistic failure prediction in dental composites.
- A probabilistic approach incorporating the Drücker-Prager stress enhances the accuracy of mechanical failure predictions.
- This study provides a validated method for assessing the reliability of composite dental restorations.