Apically Extruded Debris Using Passive Ultrasonic Irrigation Associated with Different Root Canal Irrigants

Abstract The present study evaluated the amount of apically extruded debris after chemo-mechanical preparation (CMP) associated with passive ultrasonic irrigation (PUI) using four different root canal irrigants, namely, 6% sodium hypochlorite (NaOCl), 2% chlorhexidine gel + saline solution (2% CHXg+SS), 2% chlorhexidine solution (2% CHXs) and SS alone. Sixty mandibular premolars with single straight root canals were selected and randomly assigned into 4 groups (n=15) according to the root canal irrigant used as follows: G1 (PUI + NaOCl), G2 (PUI + CHXg+SS), G3 (PUI+CHXs) and G4 (PUI+SS). Reciproc® R25 files (25/.08) were used during CMP and the debris extruded from each tooth were collected in pre-weighted Eppendorf tubes and dried. The average weight of debris was assessed by using an analytical microbalance. Data were statistically analysed by using ANOVA and post-hoc Tukey’s test (a=0.05). Debris extrusion was observed in all groups, irrespective of the root canal irrigating, with 2% CHXg + SS being associated with lower debris extrusion compared to other irrigants (p摘要 本研究评估了联合被动超声冲洗（passive ultrasonic irrigation, PUI）的化学机械预备（chemo-mechanical preparation, CMP）过程中，采用4种不同根管冲洗液时的根尖碎屑溢出量，这4种冲洗液分别为：6%次氯酸钠（sodium hypochlorite, NaOCl）、2%氯己定凝胶+生理盐水（2% CHXg+SS）、2%氯己定溶液（2% CHXs）以及单纯生理盐水（SS alone）。本研究选取60颗具有单直根管的下颌前磨牙，按照所用根管冲洗液随机分为4组（每组n=15），具体分组如下：G1组（PUI+NaOCl）、G2组（PUI+CHXg+SS）、G3组（PUI+CHXs）、G4组（PUI+SS）。所有样本的化学机械预备均采用Reciproc® R25车针（25/.08）完成，将每颗牙齿溢出的碎屑收集至预先称重的艾本德（Eppendorf）管中并进行干燥处理。采用分析微量天平测定碎屑的平均重量，通过方差分析（ANOVA）与Tukey事后检验（显著性水平α=0.05）对数据进行统计学分析。所有组别均观察到根尖碎屑溢出，与所用根管冲洗液类型无关；相较于其余冲洗液组，2% CHXg+SS组的碎屑溢出量更低（p