Department of Prosthodontics and Periodontology, Piracicaba Dental School, State University of Campinas, Piracicaba, São Paulo, Brazil.
J Prosthodont. 2011 Apr;20(3):200-4. doi: 10.1111/j.1532-849X.2010.00679.x. Epub 2011 Feb 1.
The aim of this study was to evaluate the effect of different accelerated aging times on permanent deformation and tensile bond strength of two soft chairside liners, acrylic resin (T) and silicone (MS) based.
Different specimens were made for each test of each reliner. The specimens (n = 10) were submitted to accelerated aging for 2, 4, 8, 16, 32, and 64 cycles. Tensile bond strength testing was performed at a crosshead speed of 5 mm/min and permanent deformation with a compressive load of 750 gf. Data were submitted to Mann-Whitney test to compare the materials at different times, and Kruskal-Wallis and Dunn tests were used for comparing aging intervals within a given reliner.
MS presented a lower percentage of permanent deformation (p < 0.0001) and higher tensile bond strength (p < 0.0001) than T in all time intervals and was not affected by the accelerated aging process, which reduced the permanent deformation and increased tensile bond strength of T (p < 0.05).
MS presented lower permanent deformation and higher tensile bond strength than T. Although T presented changes in those properties after accelerated aging, both materials might be suited for long-term use.
本研究旨在评估两种软质椅旁衬垫材料（丙烯酸树脂[T]和硅基[MS]）在不同加速老化时间下的永久变形和拉伸粘结强度的影响。
为每种衬垫材料的每种测试制作了不同的样本。将样本（n = 10）进行 2、4、8、16、32 和 64 个循环的加速老化处理。以 5mm/min 的十字头速度进行拉伸粘结强度测试，以 750gf 的压缩负荷进行永久变形测试。数据采用曼-惠特尼检验比较不同时间点的材料，采用克鲁斯卡尔-沃利斯和邓恩检验比较给定衬垫内的老化间隔。
在所有时间间隔内，MS 的永久变形百分比均低于 T（p<0.0001），拉伸粘结强度均高于 T（p<0.0001），且不受加速老化过程的影响，而 T 的永久变形减少，拉伸粘结强度增加（p<0.05）。
MS 的永久变形低于 T，拉伸粘结强度高于 T。尽管 T 在加速老化后其性能发生了变化，但这两种材料都可能适用于长期使用。
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