The effects of alternate irrigation of root canals with chelating agents and sodium hypochlorite on the effectiveness of smear layer removal
The effects of alternate irrigation of root canals with chelating agents and sodium hypochlorite on the effectiveness of smear layer removal
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DOI：
10.17219/acem/112603
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发表时间：
2020-02-01
影响因子：
2.1
通讯作者：
Pytko-Polonczyk, Jolanta
中科院分区：
文献类型：
--
作者：
Wilkonski, Wojciech;Jamroz-Wilkonska, Lidia;Pytko-Polonczyk, Jolanta
背景在根管机械预备后，根管壁被涂抹层覆盖。为了深入清洁牙本质小管，建议去除玷污层。对于用螯合剂冲洗或交替使用螯合剂和次氯酸钠（NaOCl）冲洗的时间长度没有共识。目的。本研究的目的是评估使用4种冲洗方案、材料和方法去除玷污层的有效性。我们准备了42个直根管，尺寸为IS 040/04，并将其分为4个研究组（n = 10）和对照组（n = 2）。对照组用5.25%NaOCl冲洗180 s，第1组用40%柠檬酸（CA）60 s + NaOCl冲洗120 s，第2组用CA 120 s + NaOCl冲洗120 s，第3组用CA 30 s + NaOCl 30 s + CA 30 s + NaOCl 120 s，第4组用5.25%NaOCl冲洗180 s，第5组用40%柠檬酸（CA）60 s + NaOCl冲洗120 s，第6组用40%柠檬酸120 s + NaOCl冲洗120 s，第6组用40%柠檬酸30 s + NaOCl冲洗120 s，第7组用40%柠檬酸30 s + NaOCl冲洗120 s，第8组用40%柠檬酸120 s + NaOCl冲洗120 s，第9组用40%柠檬酸30 s + NaOCl冲洗120 s。第4组：CA 60 s，NaOCl 30 s，CA 60 s，NaOCl 120 s。将牙根纵向劈开，在200 -500倍放大镜下观察根管。分别在距根尖2 mm、6 mm和10 mm处对根管壁进行分析。在根尖和内侧部分，第3组和第4组的效果最好。在冠状切片中，实验组之间没有发现显著差异。在本研究的限制范围内，可以得出结论，无论冲洗时间如何，交替使用NaOCl和CA的冲洗在去除玷污层方面是最有效的。
Background. After the mechanical preparation of a root canal, the canal walls are covered with a smear layer. In order to deeply clean the dentinal tubules, removal of the smear layer is recommended. There is no consensus on the length of time of rinsing with chelating agents or irrigation with alternating chelating agents and sodium hypochlorite (NaOCl).Objectives. The aim of the study was to evaluate the effectiveness of smear layer removal using 4 irrigation protocols.Material and methods. We prepared 42 straight root canals to size IS040/04 and assigned them into 4 study groups (n = 10) and a control group (n = 2). The root canals were irrigated as follows: in the control group, 180 s with 5.25% NaOCl; in group 1, 60 s with 40% citric acid (CA) and 120 s with NaOCl; in group 2, 120 s with CA and 120 s with NaOCl; in group 3, 30 s CA, 30 s with NaOCl, 30 s CA and 120 s with NaOCl; and in group 4, 60 s with CA, 30 s with NaOCl, 60 s with CA, and 120 s with NaOCl. The roots were split longitudinally and the root canals were observed under x200-500 magnification. The root canal walls were analyzed in areas 2 mm, 6 mm and 10 mm from the apex.Results. In the apical and medial sections, the best effects were achieved in groups 3 and 4. In coronal sections, no significant differences between experimental groups were found.Conclusions. Within the limitations of this study, it can be concluded that irrigation with alternating NaOCl and CA was the most effective at smear layer removal, regardless of the irrigation time.