Influence of BisGMA, TEGDMA, and BisEMA contents on viscosity, conversion, and flexural strength of experimental resins and composites

European Journal of Oral Sciences - Tập 117 Số 4 - Trang 442-446 - 2009
Flávia Gonçalves1, Yoshio Kawano2, Carmem S. Pfeifer3, Jeffrey W. Stansbury3, Roberto Ruggiero Braga4
1Department of Dental Materials, University of Sao Paulo, Sao Paulo, Brazil
2Department of Fundamental Chemistry, University of Sao Paulo, Sao Paulo, Brazil
3Department of Craniofacial Biology, University of Colorado Health Science Center, Aurora, CO, USA
4Department of Dental Materials, University of São Paulo, São Paulo

Tóm tắt

Different monomer structures lead to different physical and mechanical properties for both the monomers and the polymers. The objective of this study was to determine the influence of the bisphenylglycidyl dimethacrylate (BisGMA) concentration (33, 50 or 66 mol%) and the co‐monomer content [triethylene glycol dimethacrylate (TEGDMA), ethoxylated bisphenol‐A dimethacrylate (BisEMA), or both in equal parts] on viscosity (η), degree of conversion (DC), and flexural strength (FS). η was measured using a viscometer, DC was obtained by Fourier transfer Raman (FT‐Raman) spectroscopy, and FS was determined by three‐point bending. At 50 and 66% BisGMA, increases in η were observed following the partial and total substitution of TEGDMA by BisEMA. For 33% BisGMA, η increased significantly only when no TEGDMA was present. The DC was influenced by BisGMA content and co‐monomer type. Mixtures containing 66% BisGMA showed a lower DC compared with mixtures containing other concentrations of BisGMA. The BisEMA mixtures had a lower DC compared with the TEGDMA mixtures. The FS was influenced by co‐monomer content only. BisEMA mixtures presented a statistically lower FS, followed by TEGDMA + BisEMA mixtures, and then by TEGDMA mixtures. Partial or total replacement of TEGDMA by BisEMA increased η, which was associated with the observed decreases in DC and FS. Although the BisGMA content influenced the DC, it did not affect the FS results.

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Thông tin xuất bản

European Journal of Oral Sciences

Tập 117 Số 4

442-446

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