Vizgirda Paul J, Liewehr Frederick R, Patton William R, McPherson James C, Buxton T B
U.S. Army Dental Corps, Fort Gordon, Georgia, USA.
J Endod. 2004 Feb;30(2):103-6. doi: 10.1097/00004770-200402000-00010.
The purpose of this study was to evaluate the potential of using mineral trioxide aggregate as a root canal filling material by comparing its apical sealing ability with that of laterally condensed gutta-percha with sealer and high-temperature thermoplasticized gutta-percha with sealer in extracted bovine teeth. Sixty bovine incisors with single canals were prepared in a standard manner using LightSpeed instruments, randomly divided into three groups of 20 teeth, and obturated. The sealing ability of each technique was assessed by immersion in 1% methylene blue dye for 3 days. The teeth were cleared, and the linear extent of dye penetration was measured with a stereomicroscope. Data were analyzed by the Kruskal-Wallis one-way ANOVA followed by Dunn's test. Canals filled with laterally condensed gutta-percha or thermoplasticized gutta-percha showed significantly less apical dye penetration than canals obturated with mineral trioxide aggregate (p < 0.001). There was no significant difference in leakage between the laterally condensed group and the thermoplasticized group. The results suggest that gutta-percha obturation may provide an apical seal that is superior to MTA.
本研究的目的是通过在拔除的牛牙中比较矿物三氧化物凝聚体与侧向加压牙胶加封闭剂以及热塑牙胶加封闭剂的根尖封闭能力，来评估使用矿物三氧化物凝聚体作为根管充填材料的潜力。使用LightSpeed器械以标准方式制备60颗单根管的牛切牙，随机分为三组，每组20颗牙，并进行充填。通过将牙齿浸泡在1%亚甲蓝染料中3天来评估每种技术的封闭能力。牙齿经透明处理后，用体视显微镜测量染料渗透的线性范围。数据采用Kruskal-Wallis单因素方差分析，随后进行Dunn检验。与用矿物三氧化物凝聚体充填的根管相比，侧向加压牙胶或热塑牙胶充填的根管根尖染料渗透明显更少（p < 0.001）。侧向加压组和热塑组之间的渗漏没有显著差异。结果表明，牙胶充填可能提供优于矿物三氧化物凝聚体的根尖封闭效果。
