This study compared the mechanical properties and molecular distribution of a polymethyl methacrylate (PMMA) block (Dry) with specimens that were fabricated by a conventional method and cured in a wet environment (Control). Two specimen types were fabricated with heat-curing denture base resin. Dry specimens were polymerized at high pressure and in a dry system, while Control specimens were polymerized with a heat-curing method, in accordance with the manufacturer’s recommended procedures. Specimens from each group were evaluated for three-point bending, water sorption and solubility, and color change, and by gel permeation chromatography (GPC). Mean values for the flexural strengths and moduli of the Dry specimens were significantly higher than those of the Control specimens (P > 0.05). Water sorption and discoloration values of the Dry group were significantly lower than those of the Control group. Mean weight-average molecular weights of the Dry group were higher than those of the Control group. As compared with the conventional method, the present method of fabricating PMMA blocks under high pressure yields superior mechanical properties for the denture base.

这项研究将聚甲基丙烯酸甲酯（PMMA）嵌段（Dry）的机械性能和分子分布与通过常规方法制造并在潮湿环境中固化的样品（对照）进行了比较。用热固化义齿基体树脂制作了两种样品类型。根据制造商推荐的程序，将干燥的样品在高压下和在干燥系统中聚合，同时将对照样品通过热固化方法聚合。通过凝胶渗透色谱法（GPC）评估了每组样品的三点弯曲，吸水率和溶解度以及颜色变化。干样品的抗弯强度和模量均值显着高于对照样品（P> 0.05）。干燥组的吸水和褪色值显着低于对照组。Dry组的平均重均分子量高于对照组。与常规方法相比，本发明的在高压下制造PMMA块的方法为义齿基托产生了优异的机械性能。