Yoon T-H, Lee Y-K, Lim B-S, Kim C-W
Department of Dental Biomaterials, College of Dentistry and Intellectual Biointerface Engineering Center, Seoul National University, Seoul, Korea.
J Oral Rehabil. 2002 Dec;29(12):1165-73. doi: 10.1046/j.1365-2842.2002.00970.x.
The purpose of this study was to determine the effectiveness of polymerization in the newly introduced blue light emitting diode (LED) (Experimental, SNU, Korea), and plasma arc curing (PAC) (Apollo 95E, Elite, DMD, USA) compared with conventional halogen lamp (Spectrum 800, Dentsply, USA). Various irradiation time with fixed intensity of light-curing units (LCUs) were irradiated to produce the same total light energy. The degree of double bond conversion (DC) of three resin composite (shade A3) was measured with a Fourier-transform infrared (FT-IR) spectrophotometer at various depths from the surface. Immediately after exposure to light, 100 microm thickness of resin composite was sectioned at the 1, 2, 3 and 4 mm from the top surface. The infrared spectrum of uncured resin and each wafer specimen were then obtained. The results were as follows: DC was significantly influenced by three variables of material, depth from the surface, and light source and energy level (P < 0.01). When the same light energy was irradiated, DC by plasma arc and LED was not significantly different from the halogen lamp (P > 0.05). When light energy was increased twice, no significant difference in DC was observed up to 2 mm from the surface (P > 0.05), but DC increased significantly from 3 mm (P < 0.05).
本研究的目的是确定新推出的蓝色发光二极管（LED）（韩国首尔国立大学实验型）和等离子弧固化（PAC）（美国DMD公司的Apollo 95E Elite型）与传统卤素灯（美国登士柏公司的Spectrum 800型）相比，在聚合方面的有效性。以固定强度对光固化单元（LCU）进行不同的照射时间，以产生相同的总光能。使用傅里叶变换红外（FT-IR）分光光度计在距表面不同深度处测量三种树脂复合材料（A3色）的双键转化率（DC）。光照后立即从顶面在1、2、3和4毫米处切取100微米厚的树脂复合材料切片。然后获得未固化树脂和每个薄片样品的红外光谱。结果如下：DC受到材料、距表面深度、光源和能量水平这三个变量的显著影响（P < 0.01）。当照射相同的光能时，等离子弧和LED的DC与卤素灯无显著差异（P > 0.05）。当光能增加两倍时，距表面2毫米以内DC无显著差异（P > 0.05），但从3毫米处开始DC显著增加（P < 0.05）。
