Raman scattering determination of the depth of cure of light-activated composites: influence of different clinically relevant parameters
Raman scattering determination of the depth of cure of light-activated composites: influence of different clinically relevant parameters
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DOI：
10.1046/j.1365-2842.2002.00889.x
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发表时间：
2002-06-01
影响因子：
2.9
通讯作者：
Devaux, J
中科院分区：
文献类型：
--
作者：
Leloup, G;Holvoet, PE;Devaux, J
本研究的目的是确定光激活复合材料的固化深度与不同临床相关参数的关系。使用了拉曼光谱法。固化的测量是在相对的基础上进行的，通过将残余的未聚合的甲基丙烯酸酯C=C键在1640 cm（-1）处的振动带与用作内标的芳族C=C伸缩带在1610 cm（-1）处进行比较。所获得的信息引起了人们对曝光过程中光透射重要性的关注。用二次多项式回归分析了试样厚度对固化深度的影响。树脂复合材料的色调和透明度也改变了光透射率，因此对转化度有显著影响。此外，光源强度和距固化尖端的距离是重要的影响参数。当使用强度为300 mW cm（-2）的光装置以及使用与固化尖端的距离高于20 mm时，对于测试的树脂复合材料的所有样品厚度，观察到固化深度的显著降低。
The purpose of this research was to determine the depth of cure of light-activated composites in relation with different clinically relevant parameters. A Raman spectroscopic method has been used. The measurement of cure is made on a relative basis by comparing the vibration band of the residual unpolymerized methacrylate C=C bond at 1640 cm(-1) against the aromatic C=C stretching band at 1610 cm(-1) used as an internal standard. The information gained draw attention to the importance of light transmission during the exposure. The influence of sample's thickness on the depth of cure is illustrated by a second order polynomial regression. The shade and translucency of the resin composite also modify the light transmission and thus have a significant influence on the degree of conversion. Moreover the light-source intensity and the distance from the curing tip are important parameters of influence. A significant reduction of the depth of cure is observed for all sample thickness of resin composite tested when using a light device with an intensity of 300 mW cm(-2) as well as using a distance from the curing tip higher than 20 mm.