Apicella M J, Loushine R J, West L A, Runyan D A
US Army Dental Activity, Fort Gordon, Georgia 30905, USA.
Int Endod J. 1999 Sep;32(5):376-80. doi: 10.1046/j.1365-2591.1999.00240.x.
The aim of this study was to compare in vitro root fracture resistance following root canal filling with either Ketac-Endo or Roth's root canal sealer.
The roots of 40 teeth with single canals were instrumented and placed randomly into four groups of 10 teeth. The prepared canals were obturated with lateral compaction using gutta-percha and Roth's 801 sealer, lateral compaction and Ketac-Endo sealer or with a single cone and Ketac-Endo sealer; the fourth group acted as unfilled controls. The roots were stored for 2 weeks in 100% humidity prior to being mounted in acrylic resin blocks. A steel tipped rod attached to an Instron testing machine was positioned against the canal opening and a slowly increasing force was applied until root fracture occurred. The results were subjected to statistical analysis using Kruskal-Wallis one-way ANOVA.
There were no significant differences between the groups in terms of force required to vertically fracture the roots.
Under the conditions of this study, the use of Ketac-Endo sealer in conjunction with lateral compaction or single-cone obturation techniques does not increase the fracture resistance of root-filled teeth.
本研究旨在比较使用Ketac-Endo根管封闭剂或Roth根管封闭剂进行根管充填后牙齿体外抗根折能力。
选取40颗单根管牙齿，对其根管进行预备，随机分为四组，每组10颗牙。预备后的根管分别采用侧向加压法并用牙胶尖和Roth 801封闭剂充填、侧向加压法并用牙胶尖和Ketac-Endo封闭剂充填或单锥度充填法并用Ketac-Endo封闭剂充填；第四组作为未充填的对照组。在将牙根嵌入丙烯酸树脂块之前，先在100%湿度条件下保存2周。将一根连接到Instron试验机上的钢质尖头杆抵住根管口，缓慢增加作用力，直至牙根发生折断。采用Kruskal-Wallis单向方差分析对结果进行统计学分析。
在垂直折断牙根所需的力方面，各组之间无显著差异。
在本研究条件下，使用Ketac-Endo封闭剂联合侧向加压法或单锥度充填技术不会增加根管充填后牙齿的抗折能力。
