Interpreting finite element results for brittle materials in endodontic restorations
| Autor: | Antonio Pérez-González, Carmen González-Lluch, Jose L. Iserte-Vilar |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2011 |
| Předmět: |
Christensen criterion
lcsh:Medical technology Finite Element Analysis Biomedical Engineering Endodontics Biomaterials Stress (mechanics) Brittleness Flexural strength Finite element Ultimate tensile strength Forensic engineering von Mises yield criterion Radiology Nuclear Medicine and imaging Dental Restoration Failure Tensile testing Mathematics Mechanical Phenomena Radiological and Ultrasound Technology business.industry Endodontic restorations Research General Medicine Structural engineering Strength of materials Finite element method Equipment Failure Analysis lcsh:R855-855.5 Stress Mechanical business Simulation |
| Zdroj: | BioMedical Engineering BioMedical Engineering OnLine, Vol 10, Iss 1, p 44 (2011) Repositori Universitat Jaume I Universitat Jaume I |
| ISSN: | 1475-925X |
| Popis: | Background: Finite element simulation has been used in last years for analysing the biomechanical performance of post-core restorations in endodontics, but results of these simulations have been interpreted in most of the works using von Mises stress criterion. However, the validity of this failure criterion for brittle materials, which are present in these restorations, is questionable. The objective of the paper is to analyse how finite element results for brittle materials of endodontic restorations should be interpreted to obtain correct conclusions about the possible failure in the restoration. Methods: Different failure criteria (Von Mises, Rankine, Coulomb-Mohr, Modified Mohr and Christensen) and material strength data (diametral tensile strength and flexural strength) were considered in the study. Three finite element models (FEM) were developed to simulate an endodontic restoration and two typical material tests: diametral tensile test and flexural test. Results: Results showed that the Christensen criterion predicts similar results as the Von Mises criterion for ductile components, while it predicts similar results to all other criteria for brittle components. The different criteria predict different failure points for the diametral tensile test, all of them under multi-axial stress states. All criteria except Von Mises predict failure for flexural test at the same point of the specimen, with this point under uniaxial tensile stress. Conclusions: From the results it is concluded that the Christensen criterion is recommended for FEM result interpretation in endodontic restorations and that the flexural test is recommended to estimate tensile strength instead of the diametral tensile test |
| Databáze: | OpenAIRE |
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