Mechanical behavior of ceramic veneer in zirconia-based restorations: A 3- dimensional finite element analysis using microcomputed tomography data
| Autor: | Eduardo Passos Rocha, Ching Chang Ko, Paolo M Cattaneo, Erika Oliveira de Almeida, Amilcar C. Freitas-Junior, Rodolfo Bruniera Anchieta |
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| Rok vydání: | 2011 |
| Předmět: |
Materials science
Potassium Compounds medicine.medical_treatment Finite Element Analysis Models Biological Crown (dentistry) Stress (mechanics) Imaging Three-Dimensional Dental porcelain Flexural strength Elastic Modulus medicine Humans von Mises yield criterion Computer Simulation Cubic zirconia Dental Restoration Failure Ceramic Composite material Mechanical Phenomena Crowns Dental Bonding X-Ray Microtomography Dental Porcelain Incisor Dental Veneers visual_art visual_art.visual_art_medium Aluminum Silicates Veneer Stress Mechanical Zirconium Oral Surgery Post and Core Technique |
| Zdroj: | The Journal of Prosthetic Dentistry. 105:14-20 |
| ISSN: | 0022-3913 |
| DOI: | 10.1016/s0022-3913(10)60184-9 |
| Popis: | STATEMENT OF PROBLEM: The fracture or chipping of ceramic veneers is a common problem for zirconia-based restorations. PURPOSE: This study evaluated the stress distribution in the veneer of a maxillary central incisor restored with a complete crown using a zirconia core with a feldspathic ceramic veneer, simulating an incomplete bond between the veneer and zirconia substructure. MATERIAL AND METHODS: Based on a microcomputed tomography of a maxillary central incisor, 3 finite element models (M) for a complete crown were developed: Mf, a complete crown based on feldspathic ceramic; Mlz, a zirconia-based complete crown with a complete bond at the zirconia/veneer interface; and Mnzl, similar to Mlz, but with an incomplete bond at the zirconia/veneer interface created by using a contact element with a frictional coefficient of 0.3. A distributed load of 1 N was applied to the lingual surface at 45 degrees to the long axis of the tooth. RESULTS: The zirconia core in the Mnzl model showed peak stresses for maximum principal stress (σ(max)) and shear stress of 9.02 and 8.81 MPa, respectively. The ceramic veneer in the Mnlz model showed peak stresses for σ(max), minimum principal stress (compressive), and von Mises stresses of 5.4 MPa, 61.23 MPa, and 35.19 MPa, respectively. CONCLUSIONS: The incomplete bond increased the σ(max) in the ceramic veneer in comparison to the perfect bond condition. |
| Databáze: | OpenAIRE |
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