Department of Operative Dentistry and Endodontics, Guanghua School of Stomatology, Sun Yat-Sen University, Guangzhou, Guangdong, China.
J Endod. 2010 Feb;36(2):329-33. doi: 10.1016/j.joen.2009.10.015. Epub 2009 Dec 16.
Recently, a methacrylate-based obturation system, Resilon/RealSeal SE, has been developed to replace gutta-percha and traditional sealers. As a resin-based material, degree of conversion (DC) is one of the most important characteristics. The aim of this study was to investigate the time-dependent change of DC of RealSeal SE as well as the influence of canal moisture and root canal depth on it.
DC of RealSeal SE, either self-cured or dual-cured (n = 8 in each group), was calculated according to the Raman spectra obtained at different times after mixing. Thirty extracted teeth with single canal were instrumented and divided randomly into 2 groups in terms of different canal drying methods. In the ethanol group, excess distilled water in root canal was removed with paper points followed by 95% ethanol. In the paper points group, root canals were blot-dried with paper points until the last one appeared dry. DC of RealSeal SE was calculated from serial cross sections (2, 5, and 8 mm from the apex) obtained 1 week after obturation with Resilon/RealSeal SE.
Significant increase in DC of RealSeal SE was observed in 1 week (P < .01), with little change afterwards (P > .05). DC of sealer in ethanol group was significantly higher than in paper points group (P < .01). However, DCs of RealSeal SE at different levels of tooth sections were not significantly different (P > .05).
Both self-cured and dual-cured RealSeal SE achieved stable DC after 1 week. Root canal moisture was a critical factor in determining DC of RealSeal SE.
最近，一种基于甲基丙烯酸酯的封闭系统 Resilon/RealSeal SE 已被开发出来，以替代牙胶和传统的封闭剂。作为一种基于树脂的材料，转化率（DC）是最重要的特性之一。本研究旨在研究 RealSeal SE 的 DC 随时间的变化，以及根管湿度和根管深度对其的影响。
根据混合后不同时间获得的拉曼光谱，计算 RealSeal SE 的 DC（每组各 8 个样本）。将 30 颗单根管牙进行器械处理，随机分为两组，根据不同的根管干燥方法进行分组。在乙醇组中，用棉纸尖去除根管内多余的蒸馏水，然后用 95%乙醇。在棉纸尖组中，用棉纸尖吸干根管，直到最后一根棉纸尖变干。用 Resilon/RealSeal SE 封闭 1 周后，从根尖 2、5 和 8mm 处获得的连续切片计算 RealSeal SE 的 DC。
在 1 周内观察到 RealSeal SE 的 DC 显著增加（P <.01），此后变化不大（P >.05）。乙醇组的封闭剂 DC 明显高于棉纸尖组（P <.01）。然而，不同牙段的 RealSeal SE 的 DC 没有显著差异（P >.05）。
自固化和双重固化的 RealSeal SE 在 1 周后均达到稳定的 DC。根管湿度是决定 RealSeal SE 的 DC 的关键因素。
