Manipal College of Dental Sciences, Karnataka, India.
J Endod. 2009 Nov;35(11):1573-6. doi: 10.1016/j.joen.2009.07.021. Epub 2009 Sep 20.
The aim of this study was to assess, by scanning electron microscopic (SEM) analysis, the ability of 17% EDTA and 7% maleic acid in the removal of the smear layer from the human root canal system.
Eighty single-rooted human anterior teeth were subjected to standardized root canal instrumentation (step-back technique) and were irrigated with 2.5% NaOCl after each instrument. Based on the final irrigating solution used, samples were divided randomly into three groups: (1) the EDTA group: 17% EDTA+ 2.5% NaOCl (n = 30), (2) the maleic acid group: 7% maleic acid + 2.5% NaOCl (n = 30), and (3) the control group: 0.9% saline (n = 20). After final irrigation, teeth were prepared for SEM analysis to evaluate the cleaning of the coronal, middle, and apical thirds of radicular dentin by determining the presence or absence of smear layer. The data was statistically analyzed using the Kruskall-Wallis test.
At the coronal and middle thirds, there was no significant difference between EDTA and maleic acid. Both were equally efficient in the removal of smear layer. In the apical third, maleic acid showed significantly better smear layer removing ability than EDTA.
Final irrigation with 7% maleic acid is more efficient than 17%EDTA in the removal of smear layer from the apical third of the root canal system, which is a crucial area for disinfection.
本研究旨在通过扫描电子显微镜（SEM）分析评估 17%EDTA 和 7%马来酸去除人根管系统玷污层的能力。
80 颗单根人前牙进行标准化根管预备（后退技术），每次器械后用 2.5%次氯酸钠冲洗。根据最终冲洗液的使用情况，将样本随机分为三组：（1）EDTA 组：17%EDTA+2.5%次氯酸钠（n=30），（2）马来酸组：7%马来酸+2.5%次氯酸钠（n=30），和（3）对照组：0.9%生理盐水（n=20）。末次冲洗后，对牙齿进行 SEM 分析，以评估玷污层的存在与否来评估根管冠、中、根尖三分之一处的清洁情况。使用 Kruskall-Wallis 检验对数据进行统计学分析。
在根管冠和中部，EDTA 和马来酸之间没有显著差异。两种方法在去除玷污层方面同样有效。在根尖三分之一处，马来酸去除玷污层的能力明显优于 EDTA。
与 17%EDTA 相比，7%马来酸在根管根尖三分之一处去除玷污层的效果更好，这是消毒的关键区域。
