不同浓度乙二胺四乙酸（EDTA）对根管预备后根管壁的影响。
The effect of different concentrations of EDTA on instrumented root canal walls.
作者信息
Sen Bilge Hakan, Ertürk Ozlem, Pişkin Beyser
机构信息
Division of Endodontology, School of Dentistry, Ege University, Izmir, Turkey.
出版信息
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.
OBJECTIVE
The purpose of this study was to investigate smear layer removal and erosive capacity of different concentrations of EDTA on instrumented root canal walls.
STUDY DESIGN
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.
RESULTS
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).
CONCLUSION
Lower concentrations of EDTA can be recommended for clinical usage to avoid excessive erosion of root canal dentin.
目的
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。
研究设计
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
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）。
结论
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。
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