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首页> 外文会议>Optical diagnostics and sensing XVIII: Toward Point-of-Care Diagnostics >Evaluation of the polymerization shrinkage of experimental flowable composite resins through optical coherence tomography
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Evaluation of the polymerization shrinkage of experimental flowable composite resins through optical coherence tomography

机译：通过光学相干层析成像技术评估实验性可流动复合树脂的聚合收缩率

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This study evaluated the polymerization shrinkage of two experimental flowable composite resins (CR) with different proportions of Urethane dimethacrylate (UDMA)/triethylene glycol dimethacrylate (TEGDMA) monomers in the organic matrix (50:50 and 60:40, respectively). A commercially available flowable CR. Tetric N-Flow (Ivoclair Vivadent. Liechtenstein. Germany), was employed as the control group. The resins were inserted in a cylindrical teflon mold (7 mm diameter. 0.6 mm height) and scanned with OCT before photoactivation. immediately after and 15 minutes after light-curing (Radii-Cal, SDI, Australia, 1,200 mW/cm~2) exposure. A Callisto SD-OCT system (Thorlabs Inc, USA), operating at 930 nm central wavelength was employed for imaging acquisition. Cross-sectional OCT images were captured with 8 mm transverse scanning (2000×512 matrix), and processed by the ImageJ software, for comparison between the scanning times and between groups. Pearson correlation showed significant shrinkage for all groups in each time analyzed. Kruskal-Wallis test showed greater polymerization shrinkage for the 50:50 UDMA/TEGDMA group (p=0.001), followed by the control group (p=0.018). TEGDMA concentration was proportionally related to the polymerization shrinkage of the flowable composite resins.
机译：这项研究评估了两种实验性可流动复合树脂（CR）的聚合收缩率，其中有机基体中聚氨酯氨基甲酸酯二甲基丙烯酸酯（UDMA）/三乙二醇二甲基丙烯酸三酯（TEGDMA）单体的比例不同（分别为50:50和60:40）。市售的可流动CR。 Tetric N-Flow（Ivoclair Vivadent，列支敦士登，德国）被用作对照组。将树脂插入圆柱特氟隆模具（直径7毫米，高度0.6毫米）中，并在光活化前用OCT进行扫描。立即暴露于光固化（Radii-Cal，SDI，澳大利亚，1200 mW / cm〜2）之后和之后的15分钟。使用在930 nm中心波长下运行的Callisto SD-OCT系统（Thorlabs Inc，美国）进行成像采集。使用8毫米横向扫描（2000×512矩阵）捕获OCT横截面图像，并通过ImageJ软件进行处理，以比较扫描时间和组之间。皮尔森相关性在每次分析中显示所有组的明显收缩。 Kruskal-Wallis试验显示50:50 UDMA / TEGDMA组的聚合收缩率更大（p = 0.001），随后是对照组（p = 0.018）。 TEGDMA浓度与可流动复合树脂的聚合收缩率成正比关系。

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