METHODS: This in vitro study assessed five fluorescent orthodontic resins and a non-fluorescent control resin using spectrophotometry, a scaled image analysis of 25 μm thick resins to compare intensities, and a visual assessment. Light sources varied by flashlight lens (narrow [N], average [X], and magnified [Z]) and UV intensity (X and X High). Work parameters included distance (20-300 mm) and angulation (15-70°). Visual scores were assigned to determine discernibility.
RESULTS: The average excitation maxima was 384 nm. Fluorescence increased with more direct UV light exposure. The highest intensity was recorded with Light X High at 50 mm and 70°. Visual assessment followed image analysis trends, and fluorescence was clinically discernable for all 25 μm thick samples.
CONCLUSIONS: Excitation wavelength range of 395-405 nm is appropriate for FIT illumination. All resins were anisotropic and showed greater fluorescence with greater angle, higher UV intensity, and closer proximity.
方法:这项体外研究使用分光光度法评估了五种荧光正畸树脂和一种非荧光对照树脂,对25μm厚的树脂进行缩放图像分析,以比较强度,和视觉评估。光源因手电筒透镜而异(窄[N],平均[X],并放大[Z])和紫外线强度(X和X高)。工作参数包括距离(20-300mm)和角度(15-70°)。指定视觉评分以确定可辨别性。
结果:平均激发最大值为384nm。荧光随着更直接的UV光暴露而增加。用50mm和70°的LightXHigh记录最高强度。视觉评估遵循图像分析趋势,对于所有25μm厚的样品,荧光在临床上是可辨别的。
结论:395-405nm的激发波长范围适合于FIT照明。所有的树脂都是各向异性的,并显示更大的荧光与更大的角度,更高的紫外线强度,更接近。