Magnitude and distribution of stresses in composite resin and sound dentine interface with mechanical retentions
| Autor: | Mariano del Sol, Iara Augusta Orsi, Gisaku Kuramochi, Eduardo Borie |
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| Rok vydání: | 2015 |
| Předmět: |
Materials science
Research Shear force Composite number Odontología CIENCIAS MÉDICAS [UNESCO] Durability Ciencias de la salud Finite element method RESINAS COMPOSTAS medicine.anatomical_structure stomatognathic system Biomaterials and Bioengineering in Dentistry UNESCO::CIENCIAS MÉDICAS Ultimate tensile strength Dentin medicine von Mises yield criterion Adhesive Composite material General Dentistry |
| Zdroj: | Repositório Institucional da USP (Biblioteca Digital da Produção Intelectual) Universidade de São Paulo (USP) instacron:USP Kuramochi, Gisaku ; Borie, Eduardo ; Orsi, Iara Augusta ; Del Sol, Mariano. Magnitude and distribution of stresses in composite resin and sound dentine interface with mechanical retentions. En: Journal of Clinical and Experimental Dentistry, 2015, Vol. 7, No. 2: 232-236 RODERIC. Repositorio Institucional de la Universitat de Valéncia instname Journal of Clinical and Experimental Dentistry |
| Popis: | Background: Adhesive systems are constantly subjected to mechanical and chemical stresses that negatively impact the integrity and durability of the dentine-adhesive interface. Despite the lack of evidence to support or reject the clinical indication for mechanical retention, the potential further contribution of these preparations to the behavior of the composite resin-sound dentine bond has been rarely addressed. The authors evaluated by finite element analysis the effect of mechanical retention on the magnitude and distribution of stresses in a composite resin-sound dentin bonding interface when subjected to tensile and shear forces. Material and Methods: A three-dimensional model was created based on three cylindrical volumes representing the sound dentin, adhesive system, and composite resin. From this main model, two models were designed to simulate dentine bonding: 1) a model with no mechanical retention, which considered flat adhesion; and 2) a model with retention, which considered four hemispherical holes on the dentine surface. Both groups were subjected to linear static analysis under tensile and shear loading of 200N. Results: At the model with retentions’ bonding interface under tensile and shear loading, a concentration of Von Mises equivalent stress was observed within the retentions, with a reduction of those stresses on the bonding boundary surface. Conclusions: Additional mechanical retention increases the tensile strength of the sound dentin-composite resin bonding interface, promoting a decrease in the magnitude of the stresses and their redistribution under tensile and shear loading |
| Databáze: | OpenAIRE |
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