Physicochemical and mechanical characterization of a fiber-reinforced composite used as frameworks of implant-supported prostheses
| Autor: | Ernesto Byron Benalcazar Jalkh, Everardo N.S. de Araujo Júnior, Paulo G. Coelho, Estevam A. Bonfante, Tiago M.C. Bastos, Abbas Zahoui, Edmara T.P. Bergamo, Adolfo Coelho de Oliveira Lopes |
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| Rok vydání: | 2021 |
| Předmět: |
Dental Stress Analysis
Thermogravimetric analysis Materials science Scanning electron microscope Composite number Glass fiber 02 engineering and technology Composite Resins 03 medical and health sciences Dental Materials 0302 clinical medicine Differential scanning calorimetry Materials Testing General Materials Science Dental Restoration Failure Composite material General Dentistry Dental Implants Dental prosthesis Reproducibility of Results 030206 dentistry Epoxy 021001 nanoscience & nanotechnology RESINAS COMPOSTAS HÍBRIDAS Mechanics of Materials visual_art visual_art.visual_art_medium Computer-Aided Design Adhesive Dental Prosthesis Implant-Supported 0210 nano-technology |
| Zdroj: | Repositório Institucional da USP (Biblioteca Digital da Produção Intelectual) Universidade de São Paulo (USP) instacron:USP |
| Popis: | Objectives To characterize the physicochemical and mechanical properties of a milled fiber-reinforced composite (FRC) for implant-supported fixed dental prostheses (FDPs). Methods For FRC characterization, scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), X-ray diffraction, Fourier-transformed infrared spectrometry, simultaneous thermogravimetric analysis and differential scanning calorimetry were performed. For fatigue testing, 3-unit FRC frameworks were fabricated with conventional (9 mm2 connector area) and modified designs (12 mm2 connector area and 2.5 mm-height lingual extension). A hybrid resin composite was veneered onto the frameworks. FDPs were subjected to step-stress accelerated-life fatigue testing until fracture or suspension. Use level probability Weibull curves at 300 N were plotted and the reliability for 100,000 cycles at 300, 600 and 800 N was calculated. Fractographic analysis was performed by stereomicroscope and SEM. Results The FRC consisted of an epoxy resin (∼25%) matrix reinforced with inorganic particles and glass fibers (∼75%). Multi-layer continuous regular-geometry fibers were densely arranged in a parallel and bidirectional fashion in the resin matrix. Fatigue analysis demonstrated high probability of survival (99%) for FDPs at 300 N, irrespective of framework design. Conventional FDPs showed a progressive decrease in the reliability at 600 (84%) and 800 N (19%), whereas modified FDPs reliability significantly reduced only at 800 N (75%). The chief failure modes for FRC FDPs were cohesive fracture of the veneering composite on lower loads and adhesive fracture of the veneering composite at higher loads. Significance Milled epoxy resin matrix reinforced with glass fibers composite resulted in high probability of survival in the implant-supported prosthesis scenario. |
| Databáze: | OpenAIRE |
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