he use of an elastomeric methacrylate monomer (Exothane 24) to reduce the polymerization shrinkage stress and improve the two-body wear resistance of bulk fill composite

Autor(es)

Rocha, Mateus Garcia ^[1] ; de Oliveira, Dayane Carvalho Ramos Salles ^[1] ; de Menezes, Livia Rodrigues ^[2] ; Roulet, Jean-Francois ^[1] ; Sinhoreti, Mario Alexandre Coelho ^[3] ; Correr, Americo Bortolazzo ^[3]

Afiliação do(s) autor(es)

^[1] Univ Florida, Coll Dent, Dept Restorat Dent Sci, Ctr Dent Biomat, 1395 Ctr Dr Room D9-6, Gainesville, FL 32610 - USA

^[2] Univ Fed Rio de Janeiro, Inst Macromol Prof Eloisa Mano, Rio De Janeiro - Brazil

^[3] Univ Estadual Campinas, Piracicaba Dent Sch, Piracicaba, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Dental Materials; v. 38, n. 2, p. E43-E57, FEB 2022.
• Citações Web of Science: 0

Resumo

Objectives: Characterize the chemical structure of an elastomeric monomer (Exothane 24) and evaluate the degree of conversion (DC), polymerization shrinkage stress (PSS), rate of polymerization (Rp), flexural strength (F-Stenght), flexural modulus (F-Modulus), Vickers hardness (V-Hardness) and two-body wear resistance of dental bulk fill composites (BFCs) containing Exothane 24. Methods: The Exothane 24 was characterized using mass spectroscopy, elemental analysis, C-13- and H-1 NMR. BFCs were formulated containing Exothane 24 (E10, E25, and E50). Similar BFCs containing regular UDMA (U10, U25, and U50), commercial conventional, and BFCs were used as control groups. ATR-FTIR spectroscopy was used to measure DC and the Rp of the composites. The PSS was measured using the universal testing machine method. Specimen bars were used to assess the F-Strenght, F-Modulus, and V-Hardness. RBCs were submitted to a two-body wear test using a chewing simulator machine; the rate and volumetric wear loss were evaluated using an optical scanner. Data were analyzed statistically with alpha = 0.05 and beta = 0.2. Results: Exothane 24 is a urethane isophorone tetramethyl methacrylate monomer with polymerization stress-relieving properties. No differences were found in the DC up to 4 mm in depth for E25. All BFCs had similar F-Strenght, except for E50. E25 had the lowest volumetric wear loss and wear rate. E25 had approximately 30% lower PSS and slower Rp than commercial BFCs with similar wear resistance to conventional commercial composites. Significance: The Exothane 24 reduced the PSS and increased the wear resistance of BFCs; however, the formulation is important to optimize the properties of the BFCs. (C) 2021 The Academy of Dental Materials. Published by Elsevier Inc. All rights reserved. (AU)

• Processo FAPESP: 17/22195-9 - Desenvolvimento e caracterização de compósitos bulk fill fotopolimerizados usando banda de ressonância plasmônica de nanopartículas de prata como sistema fotoiniciador
• Beneficiário: Mateus Garcia Rocha
• Modalidade de apoio: Bolsas no Exterior - Estágio de Pesquisa - Doutorado
• Processo FAPESP: 16/05823-3 - Fontes de luz de baixa intensidade e sistemas de fotoiniciação ativados por comprimentos de ondas entre 495-750nm para materiais resinosos odontológicos
• Beneficiário: Dayane Carvalho Ramos Salles de Oliveira
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado
• Processo FAPESP: 17/22161-7 - Desenvolvimento e caracterização de materiais resinosos odontológicos ativados por comprimentos de ondas entre 495 e 750nm
• Beneficiário: Dayane Carvalho Ramos Salles de Oliveira
• Modalidade de apoio: Bolsas no Exterior - Estágio de Pesquisa - Pós-Doutorado