Dental Biomaterials, School of Dentistry, Marquette University, Milwaukee, WI, USA.
J Dent Res. 2010 Jan;89(1):82-6. doi: 10.1177/0022034509355919.
Resin-modified glass ionomers (RMGI) set by at least 2 mechanisms dependent upon reactant diffusion prior to gelation. Each reaction's kinetics and setting mechanism may rely on and/or compete with the other. In this study, we investigated RMGI setting reaction interactions using differential scanning calorimetry (DSC) by varying light-cure initiation times. A RMGI was analyzed with isothermal and dynamic temperature scan DSC with light-curing occurring immediately, or at 5 or 10 minutes after mixing as well as without light-activation. Results show that as time allowed for the acid-base reaction increased, the light-activation polymerization exotherm decreased. Conversely, analysis of DSC data suggests that earlier light-activation may limit the acid-base reaction and result in a different structured material. During early RMGI development, acid-base and light-polymerization reactions compete with and inhibit one another.
树脂改性玻璃离子体（RMGI）通过至少两种机制凝固，这两种机制都依赖于反应物的扩散，然后才发生胶凝。每个反应的动力学和凝固机制可能依赖于或与另一个反应竞争。在这项研究中，我们通过改变光固化引发时间，使用差示扫描量热法（DSC）研究 RMGI 凝固反应的相互作用。对 RMGI 进行等温分析和动态温度扫描 DSC，光固化在混合后立即进行，或者在混合后 5 分钟或 10 分钟后进行，同时也不进行光激活。结果表明，随着酸-碱反应时间的延长，光聚合放热反应减少。相反，DSC 数据分析表明，早期的光激活可能会限制酸-碱反应，并导致材料具有不同的结构。在 RMGI 的早期发展过程中，酸-碱反应和光聚合反应相互竞争和抑制。
