Solvent Degradation and Polymerization Shrinkage Reduction of Resin Composites Using Isobornyl Methacrylate

Autor(es)

Jamille Favarão ^[1] ; Dayane Carvalho Ramos Salles de Oliveira ^[2] ; Mateus Garcia Rocha ^[3] ; Maurício Matté Zanini ^[4] ; Gabriel Flores Abuna ^[5] ; Marcio José Mendonça ^[6] ; Mário Alexandre Coelho Sinhoreti ^[7]

Afiliação do(s) autor(es)

^[1] Universidade Estadual de Campinas. Dental Materials Division, Piracicaba Dental School. Department of Restorative Dentistry - Brasil

^[2] Universidade Estadual de Campinas. Dental Materials Division, Piracicaba Dental School. Department of Restorative Dentistry - Brasil

^[3] Universidade Estadual de Campinas. Dental Materials Division, Piracicaba Dental School. Department of Restorative Dentistry - Brasil

^[4] Universidade Estadual de Campinas. Dental Materials Division, Piracicaba Dental School. Department of Restorative Dentistry - Brasil

^[5] Universidade Estadual de Campinas. Dental Materials Division, Piracicaba Dental School. Department of Restorative Dentistry - Brasil

^[6] Universidade Estadual do Oeste do Paraná. Dental School. Department of Prosthodontics - Brasil

^[7] Universidade Estadual de Campinas. Dental Materials Division, Piracicaba Dental School. Department of Restorative Dentistry - Brasil

• Tipo de documento: Artigo Científico
• Fonte: Brazilian Dental Journal; v. 30, n. 3, p. 272-278, 2019-06-03.

Resumo

Abstract The aim of this study was to use the isobornyl methacrylate (IBOMA) as a combining or substituent diluent monomer in the resin matrix of dental resin composites. Thus, the resin matrix was formulated with 60 wt% of BisGMA and 40 wt% of diluent monomers. TEGDMA as the only diluent monomer was used as control with 40 wt%, while total substitution of TEGDMA was done with 40 wt% of IBOMA. The combination of IBOMA and TEGDMA was done with 20 wt% of each monomer. To the resin matrix, 65 wt% of filler particles was added. Degree of conversion (DC) using FT-IR, flexural strength (FS), flexural modulus (FM), polymerization shrinkage by gap formation (GF), Knoop hardness (KH) and solvent degradation (SD) were evaluated. Data were analyzed using ANOVA and Tukey’s test (α=0.05; b=0.2). The results showed that reducing or substituting TEGDMA using IBOMA did not affect the DC (0.085), FS (p=0.886) or FM (p=0.414). Also, when IBOMA was used, lower GF was found in comparison to the control containing only TEGDMA as the diluent monomer (p=0.032). However, even though all composites presented reduction in KH during the SD test, the combination of IBOMA and TEGDMA showed similar reduction in KHN in comparison to the control group (p=0.001), while the total substitution of TEGDMA with IBOMA decreased KHN after SD (p=0.041). Thus, the combination of IBOMA and TEGDMA seem to reduce SD and GF without affecting the properties of resin composites. (AU)

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