Sen Bilge Hakan, Ertürk Ozlem, Pişkin Beyser
Division of Endodontology, School of Dentistry, Ege University, Izmir, Turkey.
Oral Surg Oral Med Oral Pathol Oral Radiol Endod. 2009 Oct;108(4):622-7. doi: 10.1016/j.tripleo.2009.04.042. Epub 2009 Aug 20.
The purpose of this study was to investigate smear layer removal and erosive capacity of different concentrations of EDTA on instrumented root canal walls.
Forty single-rooted teeth were instrumented using step-back technique and 2.5% NaOCl. The teeth were randomly divided into 4 groups, and final flushes were preformed with different concentrations of EDTA (15%, 10%, 5%, and 1%). All specimens were prepared for scanning electron microscope evaluation.
The results showed that there was no significant difference on the smear layer removal between different concentrations of EDTA (P = .1959). Only coronal versus apical thirds showed significant difference regarding presence of smear layer (P = .0176). Whereas 15%, 10%, and 5% EDTA solutions demonstrated similar erosion patterns on the root canal walls (P > .05), 1% EDTA caused restricted erosion (P < .0001). There was no significant difference among the regions in terms of erosion (P = .6399).
Lower concentrations of EDTA can be recommended for clinical usage to avoid excessive erosion of root canal dentin.
本研究旨在调查不同浓度乙二胺四乙酸（EDTA）对根管预备后根管壁玷污层的去除情况及其侵蚀能力。
采用逐步后退技术和2.5%次氯酸钠对40颗单根管牙进行根管预备。将牙齿随机分为4组，分别用不同浓度的EDTA（15%、10%、5%和1%）进行最终冲洗。所有标本均制备好用于扫描电子显微镜评估。
结果显示，不同浓度的EDTA在去除玷污层方面无显著差异（P = 0.1959）。仅在冠部与根尖三分之一处，玷污层的存在显示出显著差异（P = 0.0176）。15%、10%和5%的EDTA溶液在根管壁上表现出相似的侵蚀模式（P > 0.05），而1%的EDTA导致的侵蚀受限（P < 0.0001）。各区域在侵蚀方面无显著差异（P = 0.6399）。
可推荐临床使用较低浓度的EDTA，以避免根管牙本质过度侵蚀。
