Ilie Nicoleta, Högg Christof
Department of Conservative Dentistry and Periodontology, University Hospital, Ludwig Maximilians University, Goethestr. 70, D-80336 Munich, Germany.
Materials (Basel). 2024 Aug 30;17(17):4292. doi: 10.3390/ma17174292.
The current development of dental materials aims to improve their properties and expand their clinical application. New flowable bulk-fill composites have been released which, unlike what was previously common in this material category, are intended to be used alone and without a top layer, in various cavities. The study compares their kinetic of light transmission during monomer-to-polymer conversion on a laboratory-grade spectrometer, as well as their elastoplastic and aging behavior under simulated clinical conditions. Major differences in the kinetic of light transmission was observed, which is related to the degree of mismatch between the refractive indices of filler and polymer matrix during polymerization and/or the type of initiator used. Compared to the literature data, the kinetic of light transmission do not always correlate with the kinetic of functional group conversion, and therefore should not be used to assess polymerization quality or to determine an appropriate exposure time. Furthermore, the initial mechanical properties are directly related to the volumetric amount of filler, but degradation during aging must be considered as a multifactorial event.
牙科材料的当前发展旨在改善其性能并扩大其临床应用。新型可流动大块充填复合树脂已上市，与该材料类别中以前常见的情况不同，这些材料旨在单独使用且无需顶层，可用于各种窝洞。该研究在实验室级光谱仪上比较了它们在单体向聚合物转化过程中的光传输动力学，以及它们在模拟临床条件下的弹塑性和老化行为。观察到光传输动力学存在重大差异，这与聚合过程中填料和聚合物基体的折射率失配程度和/或所用引发剂的类型有关。与文献数据相比，光传输动力学并不总是与官能团转化动力学相关，因此不应将其用于评估聚合质量或确定合适的曝光时间。此外，初始机械性能与填料的体积量直接相关，但老化过程中的降解必须被视为一个多因素事件。
