Yoshida K, Greener E H
Department of Fixed Prosthodontics, Nagasaki University School of Dentistry, Japan.
J Dent. 1994 Oct;22(5):296-9. doi: 10.1016/0300-5712(94)90064-7.
In general, the concentrations of photosensitizer and reducing agent in light-cured dental polymers are fixed by manufacturers for a specific product. These concentrations vary from product to product and the effect of photoinitiator concentration on the final network structures is not clear. Accordingly, the influence of varying concentrations of camphorquinone (CQ) and amine reducing agent, 2-(N, N-dimethylamino)ethyl methacrylate (DMAEMA), on the degree of conversion (DC) of an unfilled light-cured resin was investigated. The resin consisted of 50 wt% triethyleneglycol dimethacrylate (TEGDMA) and 50 wt% 1,6-bis(methacryloxy-2-ethoxycarbonylamino)-2,4,4-trimeth ylhexane (UDMA) activated with varying concentrations of CQ (0.25-5 mol.%) and DMAEMA (0.125-5 mol.%). At low CQ concentrations, the DC measured by a Fourier Transform Infrared (FTIR) spectrometer increased rapidly with increasing concentration of DMAEMA and reached a plateau. At CQ concentrations of 0.5 mol.% and above, the plateau DC values were approximately 75-77%. On the basis of the systematic variations of CQ and DMAEMA, a contour representing the optimal combination of photoinitiator concentration from the standpoint of DC was established.
一般来说，光固化牙科聚合物中光敏剂和还原剂的浓度由制造商针对特定产品固定。这些浓度因产品而异，且光引发剂浓度对最终网络结构的影响尚不清楚。因此，研究了不同浓度的樟脑醌（CQ）和胺还原剂甲基丙烯酸2-(N,N-二甲基氨基)乙酯（DMAEMA）对未填充光固化树脂转化率（DC）的影响。该树脂由50 wt%的三乙二醇二甲基丙烯酸酯（TEGDMA）和50 wt%的1,6-双（甲基丙烯酰氧基-2-乙氧基羰基氨基）-2,4,4-三甲基己烷（UDMA）组成，用不同浓度的CQ（0.25 - 5 mol.%）和DMAEMA（0.125 - 5 mol.%）进行活化。在低CQ浓度下，通过傅里叶变换红外（FTIR）光谱仪测量的DC随着DMAEMA浓度的增加而迅速增加，并达到一个平稳期。在CQ浓度为0.5 mol.%及以上时，平稳期的DC值约为75 - 77%。基于CQ和DMAEMA的系统变化，从DC的角度建立了一个表示光引发剂浓度最佳组合的等高线。
