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首页> 外文会议>Conference on Lasers in Dentistry Ⅷ, Jan 20-21, 2002, San Jose, USA >Raman study of composite resins polymerized by halogen lamp and argon laser
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Raman study of composite resins polymerized by halogen lamp and argon laser

机译：卤素灯和氩气激光聚合的复合树脂的拉曼研究

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摘要

Raman Spectroscopy was used on the present investigation to monitor the degree of conversion of microparticled composite resin (Z100-3M), polymerized by both the conventional halogen light and the Argon Laser beam. Circular blocks of composite 6mm diameter and 3mm of thickness were used on this study. The tip of the halogen light source (λ = 400-500nm, 478mW/cm~2) or the Argon laser beam (λ = 488nm, 624mW/cm~2) was positioned on the surface of the composite resin and both activated for different irradiation times (5, 10, 20, 30, 40 and 60 seconds). The top surface which was directly irradiated and the non-irradiated (inferior) surface were analyzed immediately after curing by Raman Spectroscopy. The Raman results show systematic changes of the relative intensities between the peaks at 1610 (aromatic C=C stretching mode) and the 1640 cm~(-1) (methacrylate C=C stretching mode), as a function of irradiation time. The degree of conversion was calculated based on the relative intensity change of these two modes and compared for each light source. The change in the relative intensity shows that Raman Spectroscopy can be used as an effective method to study the degree of conversion of composite resins.
机译：在本研究中使用拉曼光谱法监测由常规卤素灯和氩激光束聚合的微粒复合树脂（Z100-3M）的转化程度。这项研究使用了直径为6mm，厚度为3mm的复合材料圆形块。将卤素光源的尖端（λ= 400-500nm，478mW / cm〜2）或氩激光束（λ= 488nm，624mW / cm〜2）定位在复合树脂的表面上，并针对不同的情况进行激活照射时间（5、10、20、30、40和60秒）。固化后立即通过拉曼光谱法分析直接照射的上表面和未​​照射的（下）表面。拉曼结果表明，在1610（芳族C = C拉伸模式）和1640 cm〜（-1）（甲基丙烯酸酯C = C拉伸模式）的峰之间的相对强度随辐照时间而变化。基于这两种模式的相对强度变化来计算转换程度，并针对每个光源进行比较。相对强度的变化表明拉曼光谱法可以用作研究复合树脂转化率的有效方法。

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