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Failure stress criteria for composite resin.
R De Groot1, M C Peters, Y M De Haan
1Department of Cariology and Endodontology, University of Nijmegen, The Netherlands.
Journal of Dental Research
|December 1, 1987
Summary
The Drücker-Prager criterion better predicts composite resin failure under multi-axial stress than Von Mises criteria. This study compares failure criteria for dental composites, crucial for material selection in restorations.
Area of Science:
- Dental Materials Science
- Mechanical Engineering
- Biomaterials
Background:
- Finite element analysis (FEA) previously used Von Mises stress to assess restored teeth.
- Von Mises theory assumes equal compressive and tensile strengths, which is inaccurate for composite resins (compressive strength is ~8x tensile strength).
Purpose of the Study:
- To evaluate the applicability of modified Von Mises and Drücker-Prager criteria for composite resin failure.
- To compare these criteria under uni-axial and tri-axial stress states.
Main Methods:
- Fracture testing of light-cured composite specimens (Rectangular Bar and Single-edge Notched Bend) using a three-point bend test.
- Linear elastic finite element analysis (FEA) based on recorded load-deflection curves.
- Comparison of Von Mises, modified Von Mises, and Drücker-Prager failure criteria.
Main Results:
- The Drücker-Prager criterion demonstrated superior suitability for predicting composite resin failure.
- The Drücker-Prager criterion accurately accounts for the differing compressive and tensile strengths of composite resins.
- Von Mises and modified Von Mises criteria were less effective in describing failure under multi-axial stress states.
Conclusions:
- The Drücker-Prager criterion is more appropriate for analyzing composite resin failure, especially under complex stress conditions.
- Accurate failure prediction is essential for optimizing the design and longevity of dental restorations made from composite resins.