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一、前言热凝塑料是一种被广泛地用作口腔各种修复体渚如义齿的基托和人造牙等矫治器的生物材料。其过程是使水、石膏、聚甲基丙烯酸甲酯按比例混合,经过加热处理完成聚合反应而成为坚硬的固体。塑料的聚合反应是一种放热反应。热冶时,水温与聚甲基丙烯酸甲酯内部温度呈1:1.6比例成梯形上升,当水浴温度升至80℃左右时,由于塑料的放热反应而使温度骤然升高,通常可高达135℃左右,塑料体积大者,温度还可以高些,如果塑料的温度升得太快
I. Introduction Thermosetting plastic is a kind of biomaterial that is widely used as dental prostheses, such as dental prostheses and artificial dental appliances. The process is to make water, gypsum, polymethyl methacrylate mixed in proportion, after heat treatment to complete the polymerization and become a hard solid. Polymerization of plastic is an exothermic reaction. In the hot smelting, the water temperature and the internal temperature of the polymethylmethacrylate increase in a trapezoid ratio of 1: 1.6. When the temperature of the water bath is raised to about 80 ° C, the temperature suddenly rises due to the exothermic reaction of the plastic and can usually reach as high as 135 ℃, large plastic volume, the temperature can be higher, if the temperature of plastic rose too fast