a Department of Pedodontics, Faculty of Dentistry , Ankara University , Ankara , Turkey.
b Department of Pedodontics, Faculty of Dentistry , Erciyes University , Kayseri , Turkey.
Acta Odontol Scand. 2019 Jul;77(5):380-385. doi: 10.1080/00016357.2019.1577491. Epub 2019 Mar 12.
The purpose of this study was to compare the efficacy of different irrigation protocols on smear layer removal in root canals of primary teeth by scanning electron microscopy (SEM).
The study was conducted with 40 extracted maxillary primary incisor teeth divided into four groups (n = 10) as 1% sodium hypochlorite (NaOCl), 10% ethylenediaminetetraacetic acid (EDTA)+1% NaOCl, 6% citric acid (CA)+1% NaOCl, and 0.9% physiological saline (PS). After the irrigation procedures, root canal walls were examined by SEM and the efficacies of irrigation solutions in smear layer removal were scored and compared. Data were analyzed using Kruskal-Wallis, Friedman and Siegel Castellan tests.
The smear layer removal was found to be statistically more effective in groups of 10% EDTA + 1% NaOCl and 6% CA + 1% NaOCl when compared with the other groups (p < .05). Smear removal efficacy was statistically significantly higher in coronal and medium thirds when compared with the apical regions in the experimental groups.
It was concluded that 10% EDTA + 1% NaOCl and 6% CA + 1% NaOCl could be alternative irrigation protocols regarding smear layer removal. However, due to the absence of erosive dentinal changes, it might be suggested that using 6% CA + 1% NaOCl can be recommended compared to 10% EDTA + 1% NaOCl in primary root canals.
本研究旨在通过扫描电子显微镜（SEM）比较不同冲洗方案对乳牙根管内玷污层去除的效果。
本研究采用 40 颗上颌乳切牙，分为 4 组（n=10），分别为 1%次氯酸钠（NaOCl）、10%乙二胺四乙酸（EDTA）+1%NaOCl、6%柠檬酸（CA）+1%NaOCl 和 0.9%生理盐水（PS）。冲洗后，通过 SEM 观察根管壁，评分比较冲洗液去除玷污层的效果。数据采用 Kruskal-Wallis、Friedman 和 Siegel Castellan 检验进行分析。
与其他组相比，10%EDTA+1%NaOCl 和 6%CA+1%NaOCl 组的玷污层去除效果更为显著（p<.05）。与根尖区相比，实验组的冠部和中部的玷污层去除效果显著更高。
10%EDTA+1%NaOCl 和 6%CA+1%NaOCl 可作为去除玷污层的替代冲洗方案。然而，由于不存在腐蚀性牙本质变化，因此在乳牙根管中，6%CA+1%NaOCl 的使用可能比 10%EDTA+1%NaOCl 更具优势。
