Department of Orthodontics, University of Erciyes, Turkey.
Eur J Orthod. 2009 Dec;31(6):647-51. doi: 10.1093/ejo/cjp038. Epub 2009 Oct 25.
The aim of this investigation was to test the hypothesis that there is no difference in microleakage between composite-enamel and composite-wire interfaces, when different composites are used. Forty-five freshly extracted human mandibular incisors separated into three groups were used in the study. Multi-stranded 0.0215 inch diameter wire was bonded to enamel using two conventional (Transbond XT and Transbond LR) and a flowable (Venus Flow) orthodontic composite. The specimens were sealed with nail varnish, stained with 0.5 per cent basic fuchsine for 24 hours, sectioned and examined under a stereomicroscope, and scored for microleakage at the composite-enamel and composite-wire interfaces from the mesial and distal margins. Statistical analysis was performed using Kruskal-Wallis and Mann-Whitney U-tests with a Bonferroni correction. Little or no microleakage was observed between the composite-enamel interfaces for the three investigated composites, and any difference was not statistically significant. However, statistically significant differences were found between microleakage at the composite-wire interface for both the conventional and flowable composite groups (P < 0.001). Flowable composite showed the highest leakage (mean: 4.8 +/- 0.8 mm), while Transbond XT (mean: 0.5 +/- 0.3 mm) and Transbond LR (mean: 1.1 +/- 1.2 mm) showed significantly lower and comparable results. The amount of microleakage at the wire-composite interface was significantly greater than that at the enamel-composite interface of flexible spiral wire retainers (FSWRs). The null hypothesis is therefore rejected. Flowable composites may not be appropriate for bonding FSWRs.
本研究旨在验证以下假设，即当使用不同的复合材料时，复合树脂与金属丝之间的微渗漏没有差异。将 45 颗新鲜离体的下颌切牙分为三组，每组 15 颗。使用两根传统（Transbond XT 和 Transbond LR）和一根流动型（Venus Flow）正畸复合树脂将多股 0.0215 英寸直径的金属丝黏合在牙釉质上。将样本用指甲油密封，用 0.5%碱性品红染色 24 小时，然后横断，在体视显微镜下观察，从近远中边缘对复合树脂-牙釉质和复合树脂-金属丝界面的微渗漏进行评分。使用 Kruskal-Wallis 和 Mann-Whitney U 检验，并进行 Bonferroni 校正，对数据进行统计学分析。在三种研究用复合材料中，复合树脂与牙釉质之间的微渗漏很少或没有，差异无统计学意义。然而，在传统复合树脂组和流动型复合树脂组之间，复合树脂与金属丝之间的微渗漏存在统计学显著差异（P < 0.001）。流动型复合树脂的渗漏最高（均值：4.8 +/- 0.8 毫米），而 Transbond XT（均值：0.5 +/- 0.3 毫米）和 Transbond LR（均值：1.1 +/- 1.2 毫米）的渗漏显著较低且结果相当。金属丝-复合树脂界面的微渗漏量明显大于灵活螺旋丝保持器（FSWRs）的牙釉质-复合树脂界面。因此，零假设被拒绝。流动型复合树脂可能不适合黏合 FSWRs。
