Autor(es)

Bergamo, Edmara T. P. ^[1] ; Bastos, Tiago M. C. ^[2] ; Lopes, Adolfo C. O. ^[1] ; Junior, Everardo N. S. de Araujo ^[1] ; Coelho, Paulo G. ^[3] ; Jalkh, Ernesto B. Benalcazar ^{[1, 3]} ; Zahoui, Abbas ^[1] ; Bonfante, Estevam A. ^[1]

Afiliação do(s) autor(es)

^[1] Univ Sao Paulo, Bauru Sch Dent, Dept Prosthodont & Periodontol, 9-75 Otavio Pinheiro Brisola, BR-17012901 Bauru, SP - Brazil

^[2] Technol Inst Aeronaut, Dept Phys, 50 Marechal Eduardo Gomes, BR-12228900 Sao Jose Dos Campos, SP - Brazil

^[3] NYU, Hansjorg Wyss Dept Plast Surg Mech & Aerosp Engn, Dept Biomat & Biomimet, 345 24th St, New York, NY 10010 - USA

• Tipo de documento: Artigo Científico
• Fonte: Dental Materials; v. 37, n. 8, p. E443-E453, AUG 2021.
• Citações Web of Science: 0

Resumo

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 mm(2) connector area) and modified designs (12 mm(2) 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 (similar to 25%) matrix reinforced with inorganic particles and glass fibers (similar to 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. (C) 2021 Published by Elsevier Inc. on behalf of The Academy of Dental Materials. (AU)

• Processo FAPESP: 12/19078-7 - Desenvolvimento e processamento de compósito de Al2O3-ZrO2 para próteses monolíticas CAD/CAM: efeito do envelhecimento na resistência à flexão biaxial
• Beneficiário: Estevam Augusto Bonfante
• Modalidade de apoio: Auxílio à Pesquisa - Jovens Pesquisadores
• Processo FAPESP: 18/03072-6 - Compósitos experimentais 70%Al2O3-30%ZrO2: caracterização estrutural e da sobrevida antes e após envelhecimento
• Beneficiário: Ernesto Byron Benalcazar Jalkh
• Modalidade de apoio: Bolsas no Brasil - Doutorado
• Processo FAPESP: 16/18818-8 - EMU concedido no processo 2012/19078-7: ElectroPuls E3000 Linear-Torsion All-Electric dynamic test instrument package
• Beneficiário: Estevam Augusto Bonfante
• Modalidade de apoio: Auxílio à Pesquisa - Programa Equipamentos Multiusuários
• Processo FAPESP: 19/00452-5 - COMPÓSITOS EXPERIMENTAIS 70%Al2O3-30%ZrO2: CARACTERIZAÇÃO MECÂNICA, ESTRUTURAL E TOPOGRÁFICA
• Beneficiário: Ernesto Byron Benalcazar Jalkh
• Modalidade de apoio: Bolsas no Exterior - Estágio de Pesquisa - Doutorado
• Processo FAPESP: 19/14798-0 - Desenvolvimento de blocos pré sinterizados de compósito ZTA - 80%Al2O3/20%ZrO2 para fresagem em sistema CAD/CAM
• Beneficiário: Adolfo Coelho de Oliveira Lopes
• Modalidade de apoio: Bolsas no Brasil - Doutorado