The difference was highly significant when the coronal third was compared with the apical third of the root canal, but statistically, insignificant difference is seen between the coronal and middle third of the root canal.
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A comparative evaluation of smear layer removal by using ethylenediamine tetraacetic acid, citric acid, and maleic acid as root canal irrigants: An <i>in vitro</i> scanning electron microscopic study.
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