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首页> 外文期刊>Journal of oral rehabilitation >Changes in properties of short-term-use soft liners after thermocycling.
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Changes in properties of short-term-use soft liners after thermocycling.

机译：热循环后短期使用的软衬套的性能变化。

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The objectives of this study were to determine the influence of thermocycling on the changes of elastic modulus (EM) and colour, and to evaluate cytotoxicity after repeated elution of short-term-use soft liners. Three short-term-use soft liners [soft acrylic-based Coe Comfort (CCM), Coe Soft (CST) and Soft Liner (SFL)], and long-term-use silicone-based Tokuso Soft Liner (TSL) acting as a control were studied. EM was measured at baseline and after thermocycling at 5-55 degrees C for 500, 1000, 1500 and 2000 cycles. For the colour measurement, specimens in discs 20 mm in diameter and 1 mm in thickness were prepared, attached to a denture base resin plate, and then thermocycled as above. Colour change (Delta E*) was measured according to the Commission Internationale de l'Eclairage (CIE) L*, a*, and b* scale on a spectrophotometer. For the cytotoxicity evaluation, specimens were eluted for 24 h in culture media repeatedly up to four times, and MTT assay (3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide) was performed. EM of CCM and CST increased up to 1500 and 1000 cycles of thermocycling respectively. EM of SFL gradually increased up to 2000 cycles, and that of TSL increased after 500 cycles and did not change after then. Delta E* of soft liners after 2000 cycles except CCM were 3.68-8.65. EM increased up to 1000-1500 cycles, and perceivable colour change was observed after 2000 cycles in most materials. Therefore, short-term-use soft liners should be used within a limited time, although the cytotoxicity decreased after repeated elution.
机译：这项研究的目的是确定热循环对弹性模量（EM）和颜色变化的影响，并评估反复洗脱短期使用的软衬板后的细胞毒性。三种短期使用的软衬里[丙烯酸软质Coe Comfort（CCM），Coe Soft（CST）和Soft Liner（SFL）]和长期使用的有机硅基Tokuso Soft Liner（TSL）充当控制进行了研究。在基线和在5-55摄氏度热循环500、1000、1500和2000个循环后测量EM。为了进行颜色测量，制备直径为20mm，厚度为1mm的圆盘中的样品，将其附着在义齿基体树脂板上，然后如上所述进行热循环。根据分光光度计上的国际照明委员会（CIE）L *，a *和b *刻度测量颜色变化（Delta E *）。为了进行细胞毒性评估，将样品在培养基中反复洗脱多达24次，持续24 h，然后进行MTT分析（3-（4,5-二甲基噻唑-2-基）-2,5-二苯基溴化四氮唑）。 CCM和CST的EM分别增加到1500和1000个热循环周期。 SFL的EM逐渐增加到2000个周期，而TSL的EM在500个周期后增加，此后没有变化。除CCM外，2000年循环后软衬板的Delta E *为3.68-8.65。 EM增加到1000-1500个循环，在大多数材料中，在2000个循环后观察到明显的颜色变化。因此，尽管在反复洗脱后细胞毒性下降了，但仍应在有限的时间内使用短期使用的软衬纸。

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