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Results: None of the two groups achieved completely debrided root canals. In the coronal and middle thirds, the canal walls were clean, with no or only small areas of debris and smear layer. In the apical region, higher scores in terms of debris and smear layer were found. There were no significant differences between the two groups in smear layer and debris removal throughout the three portions of the root canal walls (P>0.05). Conclusion: In this study significant differences were not found between the root canals shaped with Revo-S and CMA NiTi rotary instruments. Both instruments produced a clean and debris-free dentine surface in the coronal and middle third, but were unable to produce dentine surfaces free from smear layer in the apical third.

Scanning Electron Microscopic Evaluation of Debris and Smear Layer after Use of Revo-S and CMA Instruments in Straight Root Canals