3D Assessment of Void and Gap Formation in Flowable Resin Composites Using Optical Coherence Tomography
3D Assessment of Void and Gap Formation in Flowable Resin Composites Using Optical Coherence Tomography
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DOI：
10.3290/j.jad.a28623
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发表时间：
2013-01-01
影响因子：
3.3
通讯作者：
Sumi, Yasunori
中科院分区：
文献类型：
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作者：
Nazari, Amir;Sadr, Alireza;Sumi, Yasunori
目的：使用光学相干断层扫描（OCT）研究复合材料类型和腔体尺寸对间隙和空隙形成的影响。材料和方法：制备两种深度（2 mm或4 mm;直径4 mm）的I类腔体，用Tri-S Bond（Kuraray Medical）进行处理，并用Surefil SDR Flow（SF; Dentsply）或Clearfil Majesty LV（MJ; Kuraray Medical）填充本体，形成四组。24小时后，使用具有1310 nm激光的扫频源OCT（Santec）以20 kHz扫频速率对样本进行3D扫描。在OCT断层图像中，评价了粘合界面和大部分剥离。计算所有组的密封界面（SP）和空隙体积（VP）的百分比值，并使用双因素和单因素ANOVA和Tukey事后检验进行统计学分析。结果：SP和VP的检测值分别为：SF-2 mm：92%和0.08%; SF-4 mm：66%和0.13%; MJ-2 mm：86%和1.79%; MJ-4 mm：33%和1.96%。两种复合材料均显示在4 mm腔深度处间隙形成显著增加（p < 0.001）。虽然SF表现出相当均匀的体积相比，MJ，腔深度没有显着影响空隙体积分数（p = 0.08）。结论：SDR（应力降低树脂）技术的可流动复合材料比传统的复合材料表现更好，但是，散装填充4毫米深的空腔将损害密封的粘接界面，无论复合材料的类型。OCT是一种非破坏性和精确地表征材料及其行为的独特方法。
Purpose: To investigate the effect of composite type and cavity size on gap and void formation using optical coherence tomography (OCT).Materials and Methods: Class I cavities of two depths (2 mm or 4 mm; 4 mm diameter) were prepared, treated with Tri-S Bond (Kuraray Medical), and bulk filled with either Surefil SDR Flow (SF; Dentsply) or Clearfil Majesty LV (MJ; Kuraray Medical) to form four groups. After 24 h, the specimens were 3D scanned using swept-source OCT (Santec) with 1310 nm laser at a 20 kHz sweep rate. In OCT tomograms, the bonding interface and the bulk of the restorations were evaluated. The percentage values of sealed interfaces (SP) and void volume (VP) for all groups were calculated and statistically analyzed using two- and one-way ANOVA and Tukey's post-hoc test. Selected specimens were cross sectioned and observed using a scanning electron microscope (SEM) and a confocal laser scanning microscope to confirm OCT findings.Results: The following values were obtained for SP and VP, respectively: SF-2mm: 92% and 0.08%; SF-4mm: 66% and 0.13%; MJ-2mm: 86% and 1.79%; MJ-4mm: 33% and 1.96%. Both composites showed a significant increase in gap formation at 4-mm cavity depth (p < 0.001). While SF showed a rather homogeneous bulk compared to MJ, cavity depth did not significantly affect the void volume fraction (p = 0.08).Conclusion: The flowable composite with SDR (stress-decreasing resin) technology performed better than the conventional composite; however, bulk filling a 4-mm-deep cavity will compromise the sealing of the bonding interface regardless of the type of composite. OCT is a unique method of characterizing materials and their behaviors nondestructively and precisely.