Arima T, Murata H, Hamada T
Department of Prosthetic Dentistry, Hiroshima University School of Dentistry, Japan.
J Oral Rehabil. 1996 May;23(5):346-52. doi: 10.1111/j.1365-2842.1996.tb00863.x.
The authors investigated the composition and structure of six hard auto-polymerizing reline resins. The chemical compositions, glass transition temperatures, molecular weights and particle size distributions of the powders, and the chemical compositions of the liquids were examined. The powder compositions were classified into three groups. The first group contained poly(methyl methacrylate). The second contained poly(ethyl methacrylate) and poly(methyl methacrylate/ethyl methacrylate) and the third contained poly(ethyl methacrylate). The average molecular weights of these powders was about 2 x 10(5). The indexes of molecular weight dispersion suggested that all powders contained polymers that had a narrow molecular weight distribution. The particle size distribution of these powders was classified into two groups. The first group was mainly in the range of 50-100 microns and the second mainly between 20 and 50 microns. The composition of the liquids was classified into three groups. The first group contained a monofunctional methacrylate monomer. The second contained a monofunctional methacrylate monomer and a plasticizer and the third contained monofunctional methacrylate monomers and cross-linking agents. The results of this experiment showed the differences in composition among the products. This will be useful for examining the relationship between the composition and mechanical properties of hard autopolymerizing reline resins.
作者研究了六种硬质自凝重衬树脂的组成和结构。对粉末的化学成分、玻璃化转变温度、分子量和粒度分布以及液体的化学成分进行了检测。粉末成分分为三组。第一组含有聚甲基丙烯酸甲酯。第二组含有聚甲基丙烯酸乙酯和聚（甲基丙烯酸甲酯/甲基丙烯酸乙酯），第三组含有聚甲基丙烯酸乙酯。这些粉末的平均分子量约为2×10⁵。分子量分散指数表明，所有粉末都含有分子量分布窄的聚合物。这些粉末的粒度分布分为两组。第一组主要在50 - 100微米范围内，第二组主要在20至50微米之间。液体成分分为三组。第一组含有单官能甲基丙烯酸酯单体。第二组含有单官能甲基丙烯酸酯单体和增塑剂，第三组含有单官能甲基丙烯酸酯单体和交联剂。本实验结果显示了产品之间的成分差异。这将有助于研究硬质自凝重衬树脂的成分与机械性能之间的关系。
