Light transmission on dental resin composites
Light transmission on dental resin composites
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DOI：
10.1016/j.dental.2007.06.015
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发表时间：
2008-05-01
期刊：
影响因子：
5
通讯作者：
Fellows, C. E.
中科院分区：
文献类型：
--
作者：
dos Santos, G. B.;Alto, R. V. Monte;Fellows, C. E.
目标。本研究的目的是：（1）检查不同厚度的两种光固化树脂复合材料的透光率特性，（2）将树脂复合材料的透光率与填料含量相关联，（3）确定光的穿透深度与波长的函数关系。使用两种树脂复合材料（Filtek Z250，颜色 A2 和 Filtek Supreme XT，颜色 A2E）。准备了六种不同厚度（0.15、0.25、0.30、0.36、0.47 和 0.75 mm）的样品（n = 3）。使用紫外可见分光光度计测量光聚合前后在 400 至 800 nm 波长下的透射率。结果和意义。两种材料之间以及每种树脂复合材料的未聚合阶段和聚合阶段之间的透射率的波长依赖性存在显着差异。在较低波长下，Filtek Supreme XT 树脂复合材料的透光率低于 Filtek Z250。然而，在更高的波长下，Filtek Supreme XT 呈现出更高的透光率。对于两种树脂复合材料，聚合后的渗透深度更高。然而，Filtek Supreme XT 在 0.15 毫米厚度下显示出更高的透射率增益。树脂复合材料的透光率特性的差异可能会影响它们的聚合深度。 (c) 2007 年牙科材料学会。由爱思唯尔有限公司出版。保留所有权利。
Objectives. The purposes of this study was: (1) to examine the light transmittance characteristics of two light-cured resin composites, for different thickness, (2) to correlate the light transmittance through the resin composites and the filler contents, and (3) to determine the penetration depth of the light as a function of the wavelength.Methods. Two resin composites (Filtek Z250, shade A2 and Filtek Supreme XT, shade A2E) were used. Specimens of six different thicknesses (0.15, 0.25, 0.30, 0.36, 0.47 and 0.75 mm) were prepared (n = 3). The transmittance at wavelengths from 400 to 800 nm was measured using a UV-visible spectrophotometer, before and after light polymerization.Results and significance. Significant differences were found in the wavelength dependence of transmittance between the two materials, and between the unpolymerized and polymerized stages of each resin composite. At lower wavelengths, the light transmittance of the Filtek Supreme XT resin composite was lower than the Filtek Z250. At the higher wavelengths, however, Filtek Supreme XT presented higher light transmittance. For both resin composites, the penetration depth was higher after polymerization. However, Filtek Supreme XT showed a higher gain in transmittance at the 0.15 mm thickness. The difference in light transmittance characteristics of the resin composites may affect their depth of polymerization. (c) 2007 Academy of Dental Materials. Published by Elsevier Ltd. All rights reserved.