Department of Dental Materials and Prosthodontics, UNESP-São Paulo State University, São Paulo, Brazil.
Gerodontology. 2012 Jun;29(2):e215-9. doi: 10.1111/j.1741-2358.2010.00447.x. Epub 2010 Nov 17.
The effect of artificial ageing on the hardness, absorption, solubility, and colour of soft denture liners was investigated.
Liner materials based on acrylic resin (Trusoft) or silicone (Dentusil, Ufi Gel P, and Ufi Gel SC) were tested before and after 2000 thermal cycles. A total of 20 specimens of each material were tested. Half of the specimens were used for hardness and colour evaluation, and the remainder for absorption and solubility tests. The hardness evaluation was carried out using a Shore A durometer, while absorption and solubility tests were performed by storing samples in a desiccator and weighing daily until reaching constant mass (W1). After thermocycling, the samples were again weighed (W2) and dried (W3). Colour was measured using a spectrophotometer. Statistical analysis was performed using GraphPad InStat at the p < 0.05 level.
Thermocycling significantly affected the hardness of the specimens. The Trusoft material exhibited the highest absorption (1.48 ± 0.48), solubility (1.26 ± 0.28), and colour change (3.92 ± 0.33), significantly different from the other materials. There were no significant differences among the silicones in terms of absorption, solubility, and colour change, except for the colour of Dentusil, which changed (0.83 ± 0.11).
It can be concluded that silicone liners performed significantly better compared to acrylic resin.
研究人工老化对软质义齿衬里材料硬度、吸水性、溶解性和颜色的影响。
测试了基于丙烯酸树脂（Trusoft）或硅树脂（Dentusil、Ufi Gel P 和 Ufi Gel SC）的衬里材料在 2000 次热循环前后的性能。每种材料共测试 20 个样本。一半样本用于硬度和颜色评估，其余用于吸水性和溶解性测试。硬度评估使用 Shore A 硬度计进行，吸水性和溶解性测试通过将样品储存在干燥器中并每天称重直至达到恒定质量（W1）来进行。热循环后，再次称重（W2）并干燥（W3）。使用分光光度计测量颜色。使用 GraphPad InStat 在 p < 0.05 水平进行统计分析。
热循环显著影响了样本的硬度。Trusoft 材料的吸水性（1.48 ± 0.48）、溶解性（1.26 ± 0.28）和颜色变化（3.92 ± 0.33）最大，与其他材料显著不同。除了 Dentusil 的颜色发生变化（0.83 ± 0.11）外，硅树脂之间在吸水性、溶解性和颜色变化方面没有显著差异。
可以得出结论，硅树脂衬里材料的性能明显优于丙烯酸树脂。
