1.0.0 • Published 2 years ago
nba_1175 v1.0.0
Wdr Udma 5.3.rar
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the matrix is of organic composition. a large group of different aromatic and diacrylate monomers and oligomers is used, such as bisphenol a-glycidylmethacrylate (bis-gma), ethoxylated bisphenol a-methacrylate (bis-ema), triethyleneglycoldimethacrylate (tegdma) and urethane dimethacrylate (udma).
the aim of this study was to evaluate the effect of different opacifiers on the color stability of experimental dental composite-resins. three metal oxides that are used as opacifiers were tested in this study: titanium oxide (tio 2 ), aluminium oxide (al 2 o 3 ) and zirconium oxide (zro 2 ). experimental composite-resins were fabricated containing 25wt.% urethane dimethacrylate (udma)-based resin matrix and 75% total filler including different concentrations of metal oxides (0, 0.25, 0.5, 0.75 and 1wt.%) blended into silane treated barium-silicate filler. the specimens (15.5mm diameter and 1mm thickness) were light-cured and tested in the transmittance mode using a uv/vis spectrophotometer at wavelengths from 380 to 700nm under a standard illuminant d65. the color differences (e* ab) between different concentrations of opacifiers were also measured in transmittance mode based on their lab values. statistical analysis by anova and tukey's test showed a significant decrease (p 84d34552a1
1.0.0
2 years ago