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A comparative study of four rotary NiTi instruments in preserving canal curvature, preparation time and change of working length

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Abstract

The purpose of this ex vivo study was to compare working time, working length changes and shaping effects using ProTaper, ProFile, FlexMaster and Mtwo rotary instruments. A total of 96 mesiobuccal roots of the first maxillary molars were prepared using these instruments. Using pre and post-radiographs, canal curvature and working length were measured. In addition, the time required for canal preparation was recorded. Data was statistically analysed using one-wayanovaand Duncan's post-hoc tests. ProTaper significantly lessened the canal curvature (P < 0.001), and Mtwo rotary instruments took significantly less instrumentation time (P < 0.001). No significant difference was observed between the four groups in changing working lengths (P = 0.081). According to the results of the study, the Mtwo rotary instruments required significantly less instrumentation time, and the ProTaper significantly changed the canal curvature.
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Keywords: FlexMaster; Mtwo; ProFile; ProTaper; canal curvature; working length; working time

Document Type: Research Article

Affiliations: 1: Resident of Endodontics, Dental School, Tehran University of Medical Sciences, Tehran, Iran 2: Social Medicine, Department of Social Medicine, Shahed University of Medical Sciences, Tehran, Iran

Publication date: August 1, 2009

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