Non-destructive characterization of voids in six flowable composites using swept-source optical coherence tomography
Non-destructive characterization of voids in six flowable composites using swept-source optical coherence tomography
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DOI：
10.1016/j.dental.2012.11.004
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发表时间：
2013-03-01
期刊：
影响因子：
5
通讯作者：
Sumi, Yasunori
中科院分区：
文献类型：
--
作者：
Nazari, Amir;Sadr, Alireza;Sumi, Yasunori
目标。本研究的目的是利用扫描源光学相干断层扫描（SS-OCT）评价不同可流动复合材料中的空隙频率（V-F）和空隙体积（V-V）。制备标准I类空腔并填充六种不同的可流动复合材料：Clearfil Majesty LV （MJ; Kuraray）、MI Flow （MW； GC）、MI Fil （ML； GC）、Beautifil Flow plus （BF; Shofu）、Palfique Estelite low Flow （EL; Tokuyama）和Surefil SDR Flow （SF; Dentsply）。在OCT下扫描修复体，分析OCT断层图，计算每种复合材料修复体的平均VF和VV。利用扫描电子显微镜（SEM）观察了各复合材料的结构。此外，通过测量放置在玻璃载玻片上的每种材料的位移来评估材料的流动性。并将OCT计算的VF和VV与微计算机断层扫描（micro-CT）计算的VF和VV进行了比较。Kruskal-Wallis ANOVA和Mann-Whitney U检验显示，复合材料之间的VF和VV值存在显著差异（p < 0.05）。在OCT断层扫描中检测到直径为35 ~ 785 μ m的空洞。MJ的VF和VV值最高，MW次之，ML、BF、EL和SF差异不显著。复合材料中填料体积与孔隙形成呈正相关，但流动性无明显变化趋势。显微ct评价验证了VF和OCT计算的VV，两者在空洞大小上有显著的相关性（p < 0.001, r = 0.94）。本研究结果表明，SS-OCT用于复合材料和修复体的实时空洞表征是可靠的。可流动复合材料中的孔隙形成与材料有关。(C) 2012年牙科材料学会。Elsevier Ltd.出版。版权所有。
Objective. The aim of this study was to evaluate the void frequency (V-F) and void volume (V-V) in different flowable composites using swept-source optical coherence tomography (SS-OCT).Methods. Standard class I cavities were prepared and filled with six different flowable composites: Clearfil Majesty LV (MJ; Kuraray), MI Flow (MW; GC), MI Fil (ML; GC), Beautifil flow plus (BF; Shofu), Palfique Estelite low flow (EL; Tokuyama) and Surefil SDR flow (SF; Dentsply). The restorations were scanned under OCT. The OCT tomograms were analyzed and average VF and VV per restoration for each composite were calculated. Scanning electron microscope (SEM) was used to observe the structure of each composite. In addition, the flowability of the materials was evaluated measuring the displacement of each material placed up-right on a glass slide. VF and VV obtained by OCT were also compared to those calculated using micro-computed tomography (micro-CT).Results. Kruskal-Wallis ANOVA and Mann-Whitney U tests revealed significantly different VF and VV values (p < 0.05) among the composites. Voids ranging from 35 to 785 mu m in diameter were detected in OCT tomograms. MJ showed highest VF and VV values followed by MW, but ML, BF, EL and SF showed no significant difference. Filler volume in composites showed a positive correlation with void formation, but flowability did not show a specific trend. Micro-CT evaluation validated the VF and VV calculation by OCT, with a significant correlation in void size (p < 0.001, r = 0.94).Conclusion. The results of this study indicate the reliability of SS-OCT for real-time void characterization of composite materials and restorations. Void formation in flowable composites is material dependent. (C) 2012 Academy of Dental Materials. Published by Elsevier Ltd. All rights reserved.