论文部分内容阅读
目的研究不同含量的有机蒙脱土(OMMT)增强义齿基托树脂强度对基托中残留甲基丙烯酸甲酯(MMA)含量的影响,以确定最佳的OMMT掺入量。方法将OMMT与PMMA按比例0%、1%、3%、5%(wt%)混合,然后滴入50ml MMA,粉液比为2g/1ml。待调和的材料进入面团期时充入直径50mm,厚3.0±0.1mm的不锈钢模具中,于水浴中加热固化,冷却后取出试样,用丙酮抽提其中残留的MMA,用氯仿萃取其在水中释放的MMA,气相色谱法测定抽提液和萃取液中MMA的浓度。结果 OMMT的量对义齿基托树脂中残留MMA的量有显著性影响(P<0.05),随着固化材料中OMMT的量的增加,残留MMA的量也逐渐增加。当OMMT的混合比例为2wt%时,不仅材料的机械性能的到了较好提升,材料中的残留MMA的量也在YY 0270-2003标准(最大2.2wt%)范围内。放置于37℃水中7d后,MMA的释放量随时间的增加趋于稳定;观察14d,MMA水中释放量小于用丙酮抽提时所测得的残留MMA量。结论固化材料中MMA的含量随着OMMT含量的增加而增加。材料在水中的MMA释放量小于用丙酮抽提时所测得的MMA量。
Objective To study the effect of different contents of OMMT on the residual methyl methacrylate (MMA) content in denture base to determine the best incorporation of OMMT. Methods OMMT and PMMA were mixed at the ratio of 0%, 1%, 3% and 5% (wt%), and then 50ml MMA was added dropwise with a ratio of 2g / 1ml. The material to be reconciled is charged into a stainless steel mold having a diameter of 50 mm and a thickness of 3.0 ± 0.1 mm when it enters the dough phase. The material is heated and solidified in a water bath. After cooling, the sample is taken out, the residual MMA is extracted with acetone, extracted in water The MMA was released and the concentration of MMA in the extract and extract was determined by gas chromatography. Results The amount of OMMT had a significant effect on the amount of residual MMA in the denture base resin (P <0.05). As the amount of OMMT in the cured material increased, the amount of residual MMA also increased gradually. When the mixing ratio of OMMT is 2wt%, not only the mechanical properties of the material are improved well, but also the amount of residual MMA in the material is YY 0270-2003 (maximum 2.2wt%). After being stored in water at 37 ℃ for 7 days, the release of MMA tended to be stable with the increase of time. At 14 days, the release of MMA in water was less than the residual MMA measured by acetone extraction. Conclusion The content of MMA in the cured material increases with the increase of OMMT content. The MMA release of the material in water is less than the MMA measured in acetone extraction.