Ruyter I E, Oysaed H
Acta Odontol Scand. 1982;40(5):319-24. doi: 10.3109/00016358209024076.
Creep characteristics of four light activated composite of different composition were determined at 37 and 50 degrees C. The creep properties were compared with the composition of the materials. The microfill material had higher creep values than those with conventional inorganic particles; possibly due to the inhomogenous distribution of the agglomerated inorganic microfill particles. Furthermore, the fraction of inorganic particles was less than in the conventional composite materials. One conventional composite, however, had nearly the same creep values as the microfill material. The content of a large monomer molecule and poor conversion in this conventional composite material may have contributed to a plasticizing effect. The composite material with the lowest creep values had an oligomer/monomer system leading to short branches with pendant methacrylate groups after polymerization and relatively good conversion.
在37摄氏度和50摄氏度下测定了四种不同成分的光固化复合材料的蠕变特性。将蠕变性能与材料成分进行了比较。微填料材料的蠕变值高于含有传统无机颗粒的材料；这可能是由于团聚的无机微填料颗粒分布不均匀所致。此外，无机颗粒的比例低于传统复合材料。然而，有一种传统复合材料的蠕变值与微填料材料几乎相同。这种传统复合材料中大量单体分子的含量以及较差的转化率可能导致了增塑效应。蠕变值最低的复合材料具有一种低聚物/单体体系，该体系在聚合后会形成带有甲基丙烯酸酯侧基的短支链，且转化率相对较高。
