Garcia Antonio, Fernandez Rocio, Arias Ana, de Gregorio Cesar
Department of Endodontics, King Juan Carlos University, Madrid, Spain.
Department of Endodontics, Complutense University, Madrid, Spain.
Eur Endod J. 2017 Apr 24;2(1):1-6. doi: 10.5152/eej.2017.16033. eCollection 2017.
The purpose of this study was to determine the efficacy of different irrigants and irrigation protocols in the removal of gutta-percha and sealer from simulated un-instrumented areas.
Eighty-four uniradicular teeth were used. After standardizing working length (WL) and preparing the glide path, coronal flaring was performed. The instrumentation phase was completed with ProFile rotary instruments up to size #35 LightSpeed LSX. Roots were split into halves: in one of them, a groove was prepared in the apical 6 mm. In the opposite one, 5 depressions were made (at 2, 4, 6, 8 and 10 mm). Irregularities were filled with AH Plus sealer and flowable gutta-percha. The Efficacy of sodium hypochlorite (NaOCl) and chloroform in removal of material and the effect of positive pressure (PP), passive ultrasonic irrigation (PUI) (one or three cycles) and paper points were analysed with the chi-square test.
Delivery by PP did not eliminate the obturator material from any artificial depression. Chloroform, when activated, demonstrated a significant linear trend in the amount of gutta-percha removed at all tested levels (P<0.01). The use of paper points after passive delivery of chloroform increased significantly the removal of gutta-percha in the groove and at 4 and 10 mm (P<0.05). Three cycles of PUI and chloroform showed significantly fewer remnants of gutta-percha (P<0.01).
Positive pressure was not effective in the removal of obturator materials with any of the tested irrigants. Chloroform delivered by PP in combination with paper points obtained a better cleaning efficacy, although its activation using PUI for three cycles of 20 s showed the best cleanliness.
本研究旨在确定不同冲洗剂和冲洗方案在从模拟未预备区域去除牙胶和封闭剂方面的效果。
使用84颗单根牙。在标准化工作长度（WL）并预备引导通道后，进行冠部扩通。使用Profile旋转器械完成预备阶段，直至#35 LightSpeed LSX型号。将牙根分成两半：其中一半在根尖6mm处制备一个凹槽。在另一半上，制作5个凹陷（分别位于2、4、6、8和10mm处）。用AH Plus封闭剂和可流动牙胶填充不规则处。使用卡方检验分析次氯酸钠（NaOCl）和氯仿在去除材料方面的效果以及正压（PP）、被动超声冲洗（PUI）（1个或3个周期）和纸尖的作用。
通过正压输送不能从任何人工凹陷中去除封闭材料。氯仿激活后，在所有测试水平下，去除牙胶的量呈现显著的线性趋势（P<0.01）。在被动输送氯仿后使用纸尖，可显著增加凹槽处以及4mm和10mm处牙胶的去除量（P<0.05）。3个周期的PUI和氯仿联合使用时，牙胶残留显著减少（P<0.01）。
对于任何测试冲洗剂，正压在去除封闭材料方面均无效。通过正压输送氯仿并联合纸尖可获得更好的清洁效果，不过使用PUI进行3个20s周期的激活显示出最佳的清洁度。
