自凝树脂聚合过程中其自身温度变化对甲基丙烯酸甲酯释放量的影响

Effect of Self-curing Resins Temperature on the Releasing Amount of Methyl Methacrylate during Processing

目的:研究自凝义齿基托树脂(简称自凝树脂)在聚合过程中其自身温度的变化趋势、甲基丙烯酸甲酯(methyl methacrylate,简称MMA)释放量的变化趋势及二者的关系。方法:室温20℃,把自凝树脂粉2g和液1g混合,调拌40s后,立即用万用表测量样本中心温度,同时用飞行时间质谱仪连续监测MMA的释放量,待MMA释放量稳定后停止监测。结果:在自凝树脂聚合过程中样本温度和MMA释放量的变化趋势相似:监测开始,温度和MMA释放量变化不大,分别在7和11min后快速升高,11和13min达最高,之后逐渐下降,直至25和23min后趋于稳定。样本温度和MMA释放量的变化存在直线相关(P<0.05)。结论:自凝树脂聚合过程中,MMA释放量随其本身温度的升高而增加,随温度的下降而减少。

Objective：To investigate the effect of autopolymerized denture base polymer（self-curing resin）temperature on the releasing amount of methyl methacrylate（MMA）during processing.Methods：Self-curing resin was mixed using a ratio of 2g of powder to 1g of liquid for 40sas the specimen.The amount of MMA released from the specimen was continuously monitored by time-of-flight mass spectrometer（TOF-MS）and the temperature of the specimen was measured by a FLUKS 17Bdigital multimeter.Results：The tendency of MMA and the temperature of the specimen were similar during processing.The temperature of the specimen was increased rapidly after 7minutes,reached the highest level at 11minutes,tended to stable after 25minutes.The amount of MMA was increased rapidly after 11minutes,reached the highest level at 13minutes,tended to stable after 23minutes.The temperature of the specimen and the amount of MMA were liner correlation（P〈0.05）.Conclusion：The temperature of self-curing resin effect on the amount of MMA during processing.