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首页> 外文会议>Conference on Lasers in Dentistry IX Jan 26-27, 2003 San Jose, California, USA >Degree of cure of composite resins polymerized by light emitting diode: an FT-Raman study
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Degree of cure of composite resins polymerized by light emitting diode: an FT-Raman study

机译：发光二极管聚合的复合树脂的固化度：FT拉曼研究

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摘要

The degree of conversion (DC) of Z100~(R) (3M) composite resin photoactivated by both Light-Emitting Diode and halogen lamp was evaluated by FT-Raman Spectroscopy. Eighteen circular blocks of resin (φ 6mm X 3mm) were cured either by the LED (λ = 470nm, 190mW/cm~2,φ= 8mm) and by the halogen lamp (λ, = 400-500nm, 600mW/cm~2,φ= 7mm) varying the irradiation time (20, 40 and 60s). The resin surfaces were analyzed immediately after curing by FT-Raman Spectroscopy. The FT-Raman results showed the reduction in monomer trough changes in the intensity of the peak at 1640cm~(-1) as a function of irradiation time. The samples that were cured by 60s with LED source reached the maximum degree of conversion of 52% and 50% for the irradiated and non-irradiated surface, respectively. Whereas the samples cured by the same irradiation time, but with halogen lamp, those values were around only 4% higher for each surface with no statistically significant difference. It was observed no statistically significant differences in the DC values between both light sources used with 40s of irradiation. Therefore we conclude that, despite of their reduced irradiance, LEDs can cure composite resin ensuring a DC without statistically significant differences from the halogen lamp.
机译：通过FT-拉曼光谱法评估了由发光二极管和卤素灯共同光活化的Z100〜（3M）复合树脂的转化度（DC）。用LED（λ= 470nm，190mW / cm〜2，φ= 8mm）和卤素灯（λ，= 400-500nm，600mW / cm〜2）固化18个圆形树脂块（φ6mm X 3mm） ，φ= 7mm）改变了照射时间（20、40和60s）。固化后立即通过FT-拉曼光谱分析树脂表面。 FT-拉曼光谱结果表明，随着辐照时间的增加，峰谷强度在1640cm〜（-1）处的单体波谷变化减小。用LED光源固化60 s的样品分别在辐照表面和非辐照表面达到的最大转化率分别为52％和50％。尽管样品在相同的照射时间下固化，但使用卤素灯，但每个表面的这些值仅高出约4％，而没有统计学上的显着差异。观察到在40s照射下使用的两个光源之间的DC值在统计学上没有显着差异。因此，我们得出结论，尽管降低了辐照度，LED仍可以固化复合树脂，从而确保DC，而与卤素灯在统计学上没有显着差异。

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