Assessment of cleaning efficacy of Mtwo NiTi rotary files and Hand K-files: A comparative in-vitro study

NTRODUCTION The goals of root canal therapy are to remove infected and necrotic pulpal tissue remnants, shape the root canal system to facilitate irrigation and medication and adequate sealing using obturation materials. 1 Rotary instruments enhance the quality of obturation by providing conical shape to the root canal. Nickle titanium (NiTi) alloy instruments inherent flexibility that allows the files to preserve the original anatomy of curved canals and reduce the chances of procedural errors. 2 Mtwo system was developed and introduced in 2003. The standard Mtwo rotary set includes four instruments with variable tip sizes ranging from #10 to #25 and tapers ranging from 0.04 to 0.06–0.07. According to the manufacturer, the minimally invasive Mtwo NiTi instruments should be used in single-length techniques without early coronal enlargement. 3