de Lange C, Bausch J R, Davidson C L
J Prosthet Dent. 1983 Mar;49(3):349-55. doi: 10.1016/0022-3913(83)90276-7.
This study demonstrated that the rate of strengthening and the ultimate strength of composite resins depend on the storage record of the material before polymerization. It is likely that both properties are related to the concentration of an effective initiator at the moment of use. For dental practice a somewhat delayed setting is inconvenient but acceptable. A decrease of ultimate strength, however, is an indication of less effective polymerization. Thus, premature disintegration may be expected from such material. Because no specification offers a measure for the shelf life of a composite resin, a reduction of the diametral tensile strength (for example, 20%) may be a useful test to indicate decomposition.
本研究表明，复合树脂的固化速率和极限强度取决于聚合前材料的储存记录。这两种性能可能都与使用时有效引发剂的浓度有关。对于牙科实践来说，固化稍有延迟虽不方便但尚可接受。然而，极限强度的降低表明聚合效果较差。因此，预计这种材料会过早崩解。由于目前尚无标准规定复合树脂的保质期，降低径向拉伸强度（例如降低20%）可能是一种指示材料分解的有用测试方法。
