IADR Abstract Archives
Water Sorption and Solubility of Experimental Composites Based on Bis-GMA, UDMA and Fit852
Objectives: To evaluate the effect of different base monomer compositions based on Bis-GMA, UDMA, and Fit852 on the water sorption and solubility of experimental composites.
Methods: The organic matrix composition of 6 model formulations was: Bis-GMA:TEGDMA and UDMA:TEGDMA in two base monomer:co-monomer resin mole % ratio (80:20 and 60:40), Bis-GMA:UDMA:TEGDMA in a base monomer:co-monomer resin mole % ratio of 35:35:30 and Fit852:UDMA:TEGDMA in a base monomer:co-monomer resin mole % ratio of 35:35:30. Additionally, CQ was used as photoinitiator (0.5wt%) DMAEMA was used as an accelerator (0.1wt%). All experimental resin composites were fabricated with the same filler particles:matrix ratio of 70 wt% and 30 wt%. To evaluate sorption and solubility, samples were fabricated using disk-shape molds (15mm in diameter and 1mm in thickness). Samples were stored in a desiccator with silica gel for 22 h at 37°C. They were later transferred to another desiccator at room temperature for 2 hrs. Samples were regularly weighted using an analytical balance until a constant weight (m1) was obtained. Thickness and diameter of the samples were measured with a digital caliper and the volume (V) was calculated in mm3. Samples were then placed individually in glass phials fully immersed in 10 mL of distilled water, and weighed in a 24 h cycle until reaching the equilibrium (m2). After reaching equilibrium, they were placed back into the desiccator and weighed every 24 h, repeating the same cycles required to obtain m1, until the mass equilibrium (m3) was reached. The following equations were used to obtain sorption and solubility of the experimental composites: Sorption = (m2 – m3)/V and Solubility = (m1 – m3)/V. Data was analyzed using a One-Way ANOVA with Tukey post-hoc test to observe significant differences amongst the groups for each variable evaluated. For all statistical testing a = 0.05 was used.
Results: Table 1. Means±SD (in μg/mm3) of water sorption and solubility of experimental groups.
Conclusions: The composition of the resin matrix influenced both the water sorption and solubility of experimental composites. The experimental composite with Fit852 within the resin matrix formulation showed approximately 2x higher water sorption when compared to the rest of the experimental groups.
Methods: The organic matrix composition of 6 model formulations was: Bis-GMA:TEGDMA and UDMA:TEGDMA in two base monomer:co-monomer resin mole % ratio (80:20 and 60:40), Bis-GMA:UDMA:TEGDMA in a base monomer:co-monomer resin mole % ratio of 35:35:30 and Fit852:UDMA:TEGDMA in a base monomer:co-monomer resin mole % ratio of 35:35:30. Additionally, CQ was used as photoinitiator (0.5wt%) DMAEMA was used as an accelerator (0.1wt%). All experimental resin composites were fabricated with the same filler particles:matrix ratio of 70 wt% and 30 wt%. To evaluate sorption and solubility, samples were fabricated using disk-shape molds (15mm in diameter and 1mm in thickness). Samples were stored in a desiccator with silica gel for 22 h at 37°C. They were later transferred to another desiccator at room temperature for 2 hrs. Samples were regularly weighted using an analytical balance until a constant weight (m1) was obtained. Thickness and diameter of the samples were measured with a digital caliper and the volume (V) was calculated in mm3. Samples were then placed individually in glass phials fully immersed in 10 mL of distilled water, and weighed in a 24 h cycle until reaching the equilibrium (m2). After reaching equilibrium, they were placed back into the desiccator and weighed every 24 h, repeating the same cycles required to obtain m1, until the mass equilibrium (m3) was reached. The following equations were used to obtain sorption and solubility of the experimental composites: Sorption = (m2 – m3)/V and Solubility = (m1 – m3)/V. Data was analyzed using a One-Way ANOVA with Tukey post-hoc test to observe significant differences amongst the groups for each variable evaluated. For all statistical testing a = 0.05 was used.
Results: Table 1. Means±SD (in μg/mm3) of water sorption and solubility of experimental groups.
Conclusions: The composition of the resin matrix influenced both the water sorption and solubility of experimental composites. The experimental composite with Fit852 within the resin matrix formulation showed approximately 2x higher water sorption when compared to the rest of the experimental groups.