螯合剂和次氯酸钠交替冲洗根管对去除玷污层效果的影响。

The effects of alternate irrigation of root canals with chelating agents and sodium hypochlorite on the effectiveness of smear layer removal.

机构信息

Research Department of the Polish Endodontic Society, Kielce, Poland.

Private dental office, Wadowice, Poland.

出版信息

Adv Clin Exp Med. 2020 Feb;29(2):209-213. doi: 10.17219/acem/112603.

DOI:10.17219/acem/112603

PMID:32101646

Abstract

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 ISO40/04 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 ×200-500 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.

摘要

背景

根管机械预备后，根管壁覆盖有玷污层。为了深度清洁牙本质小管，建议去除玷污层。对于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，尚未达成共识。

目的

本研究旨在评估 4 种冲洗方案去除玷污层的效果。

材料和方法

我们预备了 42 个 ISO40/04 尺寸的直根管，并将其分为 4 个研究组（n = 10）和 1 个对照组（n = 2）。根管冲洗如下：在对照组中，用 5.25% NaOCl 冲洗 180 s；在组 1 中，用 40%柠檬酸（CA）冲洗 60 s，用 NaOCl 冲洗 120 s；在组 2 中，用 CA 冲洗 120 s，用 NaOCl 冲洗 120 s；在组 3 中，用 CA 冲洗 30 s，用 NaOCl 冲洗 30 s，用 CA 冲洗 30 s，用 NaOCl 冲洗 120 s；在组 4 中，用 CA 冲洗 60 s，用 NaOCl 冲洗 30 s，用 CA 冲洗 60 s，用 NaOCl 冲洗 120 s。将根纵裂，在 ×200-500 倍放大倍数下观察根管。在距根尖 2、6 和 10 mm 的根管壁进行分析。