Peutzfeldt A
Department of Dental Materials, School of Dentistry, Faculty of Health Sciences, University of Copenhagen, Denmark.
J Dent Res. 1994 Oct;73(10):1657-62. doi: 10.1177/00220345940730101101.
Improved mechanical properties of resin composites have been reported to be a consequence of the addition of aldehyde to the resins. The objective of the present study was to examine whether this improvement could be attributed to an increased degree of conversion of double bonds. For this purpose, propanal was added to monomer mixtures, which were then made light-curing. The monomer mixtures were varied with respect to monomer composition and content of propanal. The quantity of remaining double bonds was determined by means of transmission infrared spectra of the resins recorded before and after wet or dry storage for one week. The addition of propanal resulted in a decrease in the quantity of remaining double bonds by as much as 89% as compared with the mixtures without propanal. Negative correlations of statistical significance were found between the content of propanal and quantity of remaining double bonds in BISGMA:TEGDMA-based as well as in UEDMA:HEMA-based resins for both modes of storage. Significant negative correlations were found between the quantity of remaining double bonds and the previously determined mechanical properties.
据报道，树脂复合材料机械性能的改善是由于在树脂中添加了醛类物质。本研究的目的是检验这种性能的改善是否归因于双键转化率的提高。为此，将丙醛添加到单体混合物中，然后进行光固化。单体混合物在单体组成和丙醛含量方面有所不同。通过对树脂在湿态或干态下储存一周前后记录的红外光谱来测定剩余双键的数量。与未添加丙醛的混合物相比，添加丙醛使剩余双键的数量减少了多达89%。在基于双酚A缩水甘油醚（BISGMA）：三乙二醇二甲基丙烯酸酯（TEGDMA）以及基于聚氨酯二甲基丙烯酸酯（UEDMA）：甲基丙烯酸羟乙酯（HEMA）的树脂中，对于两种储存方式，丙醛含量与剩余双键数量之间均存在统计学显著负相关。剩余双键数量与先前测定的机械性能之间也存在显著负相关。
