Effect of Thermocycling on Biaxial Flexural Strength of CAD/CAM, Bulk Fill, and Conventional Resin Composite Materials

Autor(es)

Benalcazar Jalkh, E. B. ^[1] ; Machado, C. M. ^[1] ; Gianinni, M. ^[2] ; Beltramini, I ^[1] ; Piza, M. M. T. ^[1] ; Coelho, P. G. ^[3] ; Hirata, R. ^[4] ; Bonfante, E. A. ^[1]

Afiliação do(s) autor(es)

^[1] Univ Sao Paulo, Bauru Sch Dent, Dept Prosthodont & Periodontol, Bauru - Brazil

^[2] Univ Estadual Campinas, Piracicaba Dent Sch, Dept Restorat Dent, Piracicaba - Brazil

^[3] NYU, Dept Biomat & Biomimet, Coll Dent, Mech & Aerosp Engn, NYU Tandon Sch Engn, Hansjorg Wyss Dept Plast Surg, NYU Langone Med Ctr, New York, NY - USA

^[4] NYU, Dept Biomat & Biomimet, New York, NY - USA

• Tipo de documento: Artigo Científico
• Fonte: Operative Dentistry; v. 44, n. 5, p. E254-E262, SEP-OCT 2019.
• Citações Web of Science: 1

Resumo

New resin-based restorative materials have been developed, such as computer-aided design/computer-aided manufacturing (CAD/CAM) and bulk-fill composites, as an alternative to traditional layering techniques. This study evaluated the biaxial flexural strength (BFS) before and after thermocycling of five different resin composites: one hybrid resin/ceramic CAD/CAM indirect material, Lava Ultimate CAD-CAM Restorative (LU, 3M Oral Care); a conventional composite, Filtek Z350 XT (Z350, 3M Oral Care); two bulk-fill composites, Tetric N-Ceram Bulk Fill (TBF, Ivoclar Vivadent) and Filtek Bulk Fill (FBF, 3M Oral Care); and one bulk-fill flow resin composite, Filtek Bulk Fill Flow (FBFF, 3M Oral Care). Three hundred disc-shaped specimens (6.5 mm in diameter and 0.5 mm thick) were fabricated and divided into five groups (n=30 for each composite and condition). The BFS test was performed in a universal testing machine at a crosshead speed of 0.5 mm/min immediately (i, 24 hours) and after thermocycling (a, 500 thermal cycles of 5 degrees C to 55 degrees C with a 30-second dwell time). The Weibull modulus (m) and characteristic stress (ii) were calculated, and a contour plot was used (m vs ii) to detect differences between groups (95% two-sided confidence intervals). Significantly higher characteristic stress was observed for LUi (286.6 MPa) and Z350i (248.8 MPa) compared to the bulk-fill groups (FBFi=187.9 MPa, FBFFi=175.9 MPa, TBFi=149.9 MPa), with no differences between LUi and Z350i. Thermocycling significantly decreased the characteristic stress of all groups with the highest values observed for LUa (186.7 MPa) and Z350a (188.9 MPa) and the lowest for FBFFa (90.3 MPa). Intermediate values were observed for FBFa (151.6 MPa) and TBFa (122.8 MPa). The Weibull modulus decreased only for FBFa compared to FBFi. Composition and thermocycling significantly influenced the biaxial flexural strength of resin composite materials. (AU)

• 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: 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: 16/18657-4 - Desenvolvimento e caracterização das propriedades ópticas, topográficas e de fases cristalinas de compósito ZTA convencional para próteses monolíticas CAD/CAM
• Beneficiário: Mariana Miranda de Toledo Piza
• Modalidade de apoio: Bolsas no Brasil - Iniciação Científica