Laboratory of Organic Chemical Technology, Department of Chemistry, Aristotle University of Thessaloniki, Thessaloniki, Greece.
Dent Mater. 2011 Oct;27(10):1003-10. doi: 10.1016/j.dental.2011.06.007. Epub 2011 Jul 23.
This work is concerned with the study of the sorption and desorption process of water, ethanol or ethanol/water solution 50% (v/v) or 75% (v/v) by the dental resins prepared by light curing of Bis-GMA, Bis-EMA, UDMA, TEGDMA or D₃MA.
A thin resin disc is placed in a bath of time to obtain the sorption curve m(t)=f(t). Then the liquid is desorbed until a constant mass for the disc is reached and the desorption curve is recorded. These experimental curves help in the determination of the sorbed/desorbed liquid amount at equilibrium, the percentage of the extracted mass of unreacted monomer known as "solubility", and the sorption/desorption diffusion coefficient which expresses correspondingly the rate of the liquid sorption/desorption.
The highest liquid uptake by dental resins was 13.3wt% ethanol for Bis-GMA-resin, 12.0wt% ethanol for UDMA-resin, 10.10wt% ethanol/water solution for TEGDMA-resin, 7.34wt% ethanol for D(3)MA-resin and 6.61wt% ethanol for Bis-EMA-resin. The diffusion coefficient for all resins was higher in water than in ethanol/water solution or ethanol. Bis-GMA-resin showed the highest diffusion coefficient (11.01 × 10⁻⁸cm² s⁻¹) followed by Bis-EMA-resin (7.43 × 10⁻⁸ cm² s⁻¹), UDMA-resin (6.88 × 10⁻⁸cm² s⁻¹), D(3)MA-resin (6.22 × 10⁻⁸ cm² s⁻¹) and finally by TEGDMA-resin (1.52 ×10⁻⁸ cm² s⁻¹).
All studied dental resins, except TEGDMA-resin, absorbed higher amount of pure ethanol than water or ethanol water solution. TEGDMA-resin absorbed higher amount of ethanol/water solution (50/50 or 75/25 (v/v)) than water or ethanol. For all studied dental resins the diffusion coefficient was higher in water than in ethanol/water solution or ethanol.
本工作研究了通过光固化 Bis-GMA、Bis-EMA、UDMA、TEGDMA 或 D₃MA 制备的牙科树脂对水、乙醇或 50%（v/v）或 75%（v/v）乙醇/水溶液的吸附和解吸过程。
将薄的树脂盘放置在浴中一段时间以获得吸附曲线 m(t)=f(t)。然后将液体解吸，直到达到树脂盘的恒定质量，并记录解吸曲线。这些实验曲线有助于确定平衡时吸附/解吸的液体量、称为“溶解度”的未反应单体的提取质量百分比以及吸附/解吸扩散系数，该系数相应地表示液体吸附/解吸的速率。
Bis-GMA 树脂对乙醇的最大液体吸收量为 13.3wt%，UDMA 树脂对乙醇的最大液体吸收量为 12.0wt%，TEGDMA 树脂对乙醇/水溶液的最大液体吸收量为 10.10wt%，D(3)MA 树脂对乙醇的最大液体吸收量为 7.34wt%，Bis-EMA 树脂对乙醇的最大液体吸收量为 6.61wt%。所有树脂在水中的扩散系数均高于乙醇/水溶液或乙醇。Bis-GMA 树脂表现出最高的扩散系数（11.01×10⁻⁸cm² s⁻¹），其次是 Bis-EMA 树脂（7.43×10⁻⁸ cm² s⁻¹）、UDMA 树脂（6.88×10⁻⁸cm² s⁻¹）、D(3)MA 树脂（6.22×10⁻⁸ cm² s⁻¹），最后是 TEGDMA 树脂（1.52×10⁻⁸ cm² s⁻¹）。
除 TEGDMA 树脂外，所有研究的牙科树脂对纯乙醇的吸收量均高于水或乙醇水溶液。TEGDMA 树脂对水或乙醇的吸收量高于乙醇/水混合物（50/50 或 75/25（v/v））。对于所有研究的牙科树脂，在水中的扩散系数均高于乙醇/水混合物或乙醇。
